The other day we visited Australian age of Dinosaurs in Winton and not only was it an amazing tourist experience but we also came across the biggest population of Ficus cerasicarpa that I’ve seen to date. About 20 trees are growing along the side of a metal walkway set up as part of the tour. Another good sized tree grows behind the lab which is labelled incorrectly as Ficus brachypoda.
There wasn’t any fruit but the foliage and growth habit was just like that of the cerasicarpa from Cloncurry and Mt Isla.
If you’re ever in Winton and have a thing for Dinosaurs or Rock figs you should check out Australian age of Dinosaurs!
Ficus tinctoria is a little mentioned fig that grows through out Malesia and Australia. The majority of the Australian collections come from the Kimberley region of northern WA though there are 3 individual collections from the coast of Queensland between Cairns and Townsville.
These collections struck me as unusual for several reasons. They were collected a fair way down the Queensland coast which is a long way from the PNG populations from which they must surely be related. There are only 3 collections although the area is well explored and the lots of the closely related Ficus virgata have been found in the same area.
Being unusual collections for their collection site they were assigned as species syntypes making them pretty important specimens! It also means that photographs of the collections are available online at the Jstor website saving me a trip to the Melbourne herbarium. I have seen several of Western Australian Ficus tinctoria and they are fairly different to the eastern species Ficus virgata. The two species co-occur in PNG where they must surely hybrise and many of the tinctoria collections from outside of Australia look nothing like the Australian plants.
When the leaf veins of the Queensland tinctoria collections are compared with those of juvenile virgata leaves, they are almost identical. When compared to a leaf from a Western Australia tinctoria, they don’t match. The marginal loops of the secondary veins of virgata are much flatter than those of tinctoria and the tertiary veins of the two species create different patterns. The large leaves of the Qld tinctoria collections are likely juvenile virgata leaves being much larger than typical adult foliage.
I was asked to help out with using ‘Novoplasty’ to build complete chloroplast sequences from shorter dna strands. It’s a pretty amazing app that’s easy enough to use but it only lets you run one seed file at a time – (I’m assuming if you’re reading this you understand what ‘Novoplasty’ is!). Doing lots of runs can quickly eat up your day so I decided to write a perl script that will run batches of seed files through ‘Novoplasty’. Following is how you can use it.
First download a copy of ‘Novoplasty’ and ‘Batch Novoplasty’.
The batch script has been written to work with version Novoplasty 2.5.6. You can open the ‘Batch Novoplasty’ in a text editor and change this to work with other versions. This is hard coded near the bottom of the script so be careful when you change the text! Feel free to change the message that’s printed when the script finishes, if it makes your life better!
Place ‘Novoplasty’ and ‘Batch Novoplasty’ files in the same folder. Open a terminal window, drag ‘Batch Novoplasty’ into the terminal window, and click return. This will create three folders and ask you to place your files in them. The folders are:
Place your .fasta files containing the seed data into the ‘1_Seed_Files’ folder. Each .fasta file should contain one seed, best to clean the data by removing the header and any lower case a, g, c’s or t’s from the beginning. ‘Novoplasty’ will only read in 100 characters so give it good data to work with.
If your sequences have been supplied in a single .fasta file I’ve attached another perl script that can be used to pull them apart. It relies on each sequence starting with “>Seq_”. The text that follows “>Seq_” is used to create a unique name for each seed file. Either start all your seed fragments with “>Seq_” (followed by a unique identifier like a bar code number) or change the variable inside the script to suit your current format. You will need to name the file containing all your seed fragments “split.fasta”. This script assumes the first 100 characters of your seed fragment are header details and removes them, it also removes any lower case a, g, c’s or t’s from the beginning of the seed.
Rename the seed file to split “split.fasta” and place it in the same folder as the “Split Fasta File” script. Open a terminal window, drag the “Split Fasta File” script in and hit return. The script should spit out a new fasta file for each occurrence of your delimiter string i.e. “>Seq_”.
If running the script gives a permission error, check that the script file is set to be executable. Part of the script that passes the middle 100 characters of your seed to ‘Novoplasty’ has been commented out. The idea was that the middle 100 characters should be clear of any messy sequencing errors that often occur at the beginning and end of a read. If you liked to use this, simply uncomment the section by removing the # at the beginning of each line. Move all the resulting seed files into the ‘1_Seed_Files’ folder for the Batch script to use.
Next place your forward and reverse data into the folders ‘2_Reads_Forward’ and ‘3_Reads_Reverse’. The batch should work with .fastq or . fastq.gz, though I’ve only tested it with fastq.gz files. The script will only read in one file per folder. Jump into terminal again, drag and drop the ‘Batch Novoplasty’ file into your terminal window, hit return and that ‘should’ be it. Your seed files will be read in one at time and built using the supplied forward and reverse files. You won’t get all the normal feed back supplied by ‘Novoplasty’, just a simple ‘processing Seed file 1’ etc…
Note changing variables in the config file won’t have an effect on ‘Novoplasty’. The batch script recreates the config for every new seed file. If you need different settings in the config file make the changes inside the ‘Batch Novoplasty’ script.
If you want to run multiple batches at the same time, just set up a folder for each batch, put ‘Novoplasty’ and the ‘Batch Novoplasty’ scripts in the same folder and run the batch script in a different terminal window for each batch.
Here’s another example of a hybrid arising from two dioecious fig species in my Sydney backyard. The maternal plant (mother) that produced the seed is a Ficus congesta or Red leaf fig that’s commonly encounted in the Australian tropics. The paternal (father) plant that produced the pollen seems to be a Ficus opposita which grows along the east coast of Queensland. From first appearance these species are quite distantly related. F. opposita is a sandpaper fig, while F. congesta has only a slight rough texture to its leaves and a hint of glossiness.
F. congesta can form masses of cauliflorous fruiting stems around the trunk with the fruit staying green and hard before rotting. The trunks of some trees is hidden behind a thick mass of fruiting branches. I don’t know if the fruit ever turns fleshy? Common throughout the rainforest understory and preferring locations with access to water. F. opposita tends to form fruit in pairs towards the ends of its branches that ripen to a fleshy purple-black. It is frequently found in open woodlands, though it too loves water if it can get it.
Both species are placed in the genus “Ficus”, subgenus “Ficus” with F. congesta being grouped with F. hispida and F. septica, while F. opposita is grouped with the sandpaper figs. The two species can occur in sympatry at least in Queensland and there are bound to be naturally formed hybrids. F. congesta is probably able to hybridise with F. hispida and F. septica. This example of crossing with F. opposita suggests that F. congesta could cross with other sandpaper figs as well.
This seedling is about 2 years old and in my eyes displays pretty clear intermediate morphology between the two parent species. The pollinating wasps for both species are not found in Sydney leaving the pollinating wasp of F. coronata as the likely mating intermediate.
Sometime ago I read about fig roots tightening as they hit the ground, acting like tent ropes, pulling tight to help hold the tree steady. Claus Mattheck in his book ‘Design in Nature: Learning from Trees’, references a paper by zimmerman et al. saying “the anchored aerial roots tighten themselves up so much that they can easily raise a pot of soil in which they are anchored.” As more roots grow down they cross over each other, welding together to form a network of support for the tree.
Recently I noticed some of my plants displaying this behaviour and it made me think about how cleaver it is! How does the root know when it has hit the ground? What makes it decide to start tightening? How does the root go about tightening?
The root may realise it is now in the dark and pull tight, but I’ve seen aerial root tips covered in hessian to keep them moist and they don’t pull tight, so it’s probably not light related. If it is the dark that triggers the root to tighten then the root would need to remember it had previously been in the light, understand that it’s environment had changed and it should now tighten. I really have no idea what mechanism is triggering the root to change it’s behaviour!
Once the root has noticed it is in the ground, how does it then go about tightening the root? It seems to me that the plant would need to kill off cells in the root, like removing links in a loose necklace, causing the root to shorten and therefore tighten. Some how selecting cells that are now excessive and using ‘Apoptosis’ to kill off the cells. What ever mechanism the root uses to tighten it is surely a complicated process that needs to be driven by some intelligence.
Most people still find it hard to believe animals are intelligent, so to expect someone to accept plants are intelligent, is a bit of a stretch. In fact it’s hard to find many biologists or even botanists that accept plants are intelligent so I don’t suggest you bring it up if you want to get a job in science – maybe I should take my own advice!
Anthony Trewavas in his excellent (but complicated to read) book writes about plants using swarm intelligence. Individual parts of the plant communicating and working together as a team. Other references, starting with Darwin, refer to the tips of roots having a section near the tip, that acts like a brain. Hopefully the next generation of biologist will be more open-minded and start to unlock how these amazing processes are driven.
Here’s a side by side comparison of a juvenile leaf from a cultivated seedling of Ficus cerasciarpa (right) and an adult leaf from a cultivated cutting of a wild tree (left). As you can see they are very different, figs having different juvenile foliage is pretty common. Young plants tend to have bigger leaves and internodes, growing as quick as possible to establish themselves while times are good. As the plant matures, its growth rate, leaves and internodes tend to reduce along with its water and nutrient requirements.
The juvenile leaf is pretty much double the size (around 24cm long) of the adult leaf (about 12cm) and it’s unlikely that seedlings in the wild would produce leaves this big. The young leaf is glossy dark green with a fine covering of almost invisible hair on the underside. Both surfaces of the adult leaf are covered in an obvious layer of downy hair, preventing the sheen of the younger leaf. The adult leaf blade is also thicker than that of the juvenile leaf. The vein pattern and colour is similar between the leaves.
Ficus tinctoria grows throughout the pacific islands and has many uses. The fruit is a staple food for some cultures and can be crushed to produce a dye, hence the common name of ‘Dye Fig’. Other parts of the plant are used for to create fiber and medicines. Its growth habit can vary from a small rambling shrub to a tall lofty tree, growing on rocks, as a strangler or directly in soil.
The Australian distribution of Ficus tinctoria is a little unusually. There are two small populations. One on the east coast of Queensland, which I had previously written off as being incorrectly identified as Ficus virgata which I am yet to see them in the wild or the herbarium. And another population in Western Australia. After recently visiting some of the Western Australian population, it struck me how unusually it was for these trees to be growing where they are. Here is a plant that grows through out the pacific islands and so how did it make its way to the middle of arid Western Australia.
One explanation could be that it is a remnant rainforest tree, which may be true, though I think the area was dried out a long time before the arrival of this plant. My thought is, that Ficus tinctoria was relocated by people. The Western Australian location I saw is a perfect place for people to live, a little oasis in an otherwise dry and hot region and with this plant having so many uses it would make sense for people to move it there.
A 2010 study showed that Livistona palms arrived in Australia about 15,000 years ago and plants from Northern Territory made their way 1000 kilometers to another location in Western Australia, probably with human intervention. Another paper used DNA and Aboriginal stories to recreated the distribution of Baobab trees across Australia, finding that “ancient humans significantly influenced the geographic distribution of Adansonia (Baobab) in northwest Australia”. It would be interesting to see if DNA could reveal where the Australian Ficus tinctoria came from. Were they introduced by seafarers? Are the two Australian populations genetically identical or were the two populations established independently by different groups of people? Have the tinctoria and virgata of Queensland interbreed? So many questions!!!
It’s not unusual for populations separated by vast distances to show variation in form, after all this is how we believe many new species originate. However the variation between two populations of Ficus adenosperma, one in Eastern Qld and the other in Litchfield NT, suggest there is something more than mere geographic isolation at play. Berg and Corner (2005) described adenosperma as growing along the north-eastern coast of QLD and islands to the north of Australia, Solomon Islands, New Hebrides, Moluccas and New Guinea. The description noted variation in the amount of hair on the leaves, the Qld population being mostly hairless, while other populations are distinctly hairy. No where in the description is it mentioned that this species has hollow stems, something I would think is an important identifying feature, nor is it mentioned that adenosperma grows in the Northern Territory.
The accepted distribution of Australian adenopserma includes Litchfield National Park and the north-eastern tip of NT, which may be valid records though something has me wondering if they’re correctly identified. Dixon (2011) in Flora of the Darwin Region mentions that adenosperma rarely occurs in Darwin and has ‘hollow’ stems. As far as I am aware having hollow stems is not a variation, either a species has hollow stems or it doesn’t. All the species of hollow stemmed figs that grow in Australia to my knowledge are consistently hollow.
The Sydney Botanical Gardens collection of adensperma is only small, there were about 5 Australian collections with only one from Litchfield. From first impressions this single collection is very different to the QLD specimens, having broad leaves with distinct raised yellow venation and hollow stems. The leaves of QLD adenosperma are generally narrow, more linear than broad and have solid stems. Hollow stems in one population but not in another leads me think of two possible explanations. 1. The Northern Territory plants are not the same species as the QLD plants or 2. The NT plants have mixed parentage, maybe one of the parents is a hollow stemmed species like hispida – though I doubt hispida is a close enough relative to be able to hybridise with adenosperma. If the NT plants turn out to be a different species that raises the question, which of the populations are truly adenosperma?
The plants in QLD were identified by Berg and or Corner, with an extensive history working with the Figs of Asia, it would seem that the QLD population are correctly identified and the NT plants are incorrectly named. Yet I’m not totally comfortable with that idea. The few adenosperma I saw collected from outside of Australia, appeared to be more like the NT plants, having broader leaves and at least one collection having hollow stems. The illustrations in Berg and Corner also seem more like the NT populations and it is noted that the QLD population are at the extreme end of the variation. So are hollow stems a typical feature of adensperma and the QLD plants are wrongly included in this species, did Berg and Corner somehow forgot to mention this species has hollow stems? Or are the hollow stemmed plants from outside of Australia also potential hybrids with a hollow stemmed species?
Only a month ago I was in Litchfield and high on my list was to find some of these ‘adenosperma’, sadly I ran out of time and missed an opportunity to see living plants, which are much easier to identify than dried collections. Hopefully in the future I can see all the collections of the species and come to a clearer understanding of what is going on!
Berg and Corner 2005 – Flora Malesiana Volume 17 / Part 2, Series 1 – Seed Plants P 353 – 355
D.J. Dixon 2011 – Flora of the Darwin Region Volume 1, Moraceae
As ‘everyone’ knows, figs are apparently pollinated by a single species of wasp. Therefore a fig species that is moved to new country without its pollinator wasp, shouldn’t form ripe fruit. Well here’s yet another example of an exotic fig, growing in Australia and producing ripe fruit without access to its pollinator.
The plant at hand is a bit of a botanic oddity. Sometimes called Ficus microcarpa var crassifolia and sold under the common names of ‘Green Island’, ‘Green Mound’, ‘Wax Fig’ etc. Small growing to maybe 1.5m – maybe becoming a tree over time, with a distinctly thick round leaf . This plant is widely grown as a shrub or hedge in tropical areas, yet the plant seems to be unrecognised botanically? Berg and Corner in ‘Flora Malesiana’ have synonymised the name of microcarpa var crassifolia with the species and without researching too hard, I haven’t been able to find a true botanically reference to this plant. This may be because the plant has been developed in cultivation and botanists only really care about naturally occurring populations of plants?
It would be interesting to know the origin of this plant. Possibly described for the first time in ‘Ficus microcarpa var. crassifolia W.C. Shieh in Quart. J. Taiwan Mus. 16: t. 5. 1963’ and mentioned again in ‘Ficus microcarpa var. crassifolia (W.C. Shieh) J.C. Liao in Ser. Publ. Forest. Exp. Forest NTU 62: 79. 1974’. But hey the name of the plant isn’t really the point here and I’ll look into that another day! I’m not even sure this plant is a variety of microcarpa, it looks way too different for my liking, but again, that’s not the focus here.
I’ve had these plants in my collection for over a decade. Each year they happily grow masses of fruit and every year that fruit goes unpollinated. Until this year! One lonely fruit turned dark purple and soften up. It’s now Autumn in Australia, the days are still warm and the nights are rapidly cooling so I’m hoping it will be warm enough to germinate the seed. It will be interesting to see what the offspring look like. Hopefully they’ll give some clues to which species is the father.
When growing fruit trees from seed you can be in for a painfully long wait before getting your reward. From the many hundreds of fig seedlings I’ve grown, only a handful have reached sexual maturity. This small sample size has shown that sandpaper figs mature the quickest, some setting fruit around year five. While rock and strangler figs take longer to fruit at around their tenth year.
Many of my sandpaper figs have produced fruit within their first year, which didn’t strike me as being odd. It wasn’t until one of my rock fig seedlings produced fruit in its first year that I clicked to the fact that all these plants are (potential) hybrids. This early fruit production seems to be the result of hybrid vigor or ‘Heterosis’.
Heterosis is a strange phenomenon where the offspring of a mating will produce features that surpass those of both the parents. It tends to happen when distantly related individuals are mated, either from different populations, species or even genus. In plants hybrid vigour often displays as faster or larger growth than the parents exhibited. The unusually early sexual maturity of these cross species Ficus seedlings may be the result of hybrid vigor.