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Canna edulis "Queensland arrowroot" was grown for commercial starch production in subtropical Australia before industrialisation of agriculture. It is currently grown extensively in south east Asia in marginal mountain regions unsuitable for other crops for the production of cellophane noodles. The crop is hardy and adaptable in low frost climates and produces one of the largest and most digestible starch grains, separated from the tuber by wet milling and settling. Traditionally the crop is grown by vegetative propagation, requiring considerable hand labour and making it more difficult to scale up the crop between seasons. This project seeks to develop a strain of achira that can produce high quality tubers when grown from seed. Crops have been reliably established by direct seeding. The large seeds are incredibly tough and withstand prolonged storage under non-ideal conditions, potentially making them useful as a food security resource. The green tops of the crop are a high nitrogen fodder for livestock and the seeds are also edible. A seed grown strain might allow the crop to be grown seasonally in regions with cold winters. The genus contains about 30 species from a variety of habitats. The cultivated clones are believed to be descended from C. discolor but their origins are uncertain. The Queensland arrowroot clone rarely sets seed but has been found to produce viable pollen that germinates in vitro. The pollen has been found to lose viability when desiccated and/or frozen, much like banana pollen. This clone typically flowers later than other species, making cross pollination uncommon. Strategic cutting back of plants of other species can cause them to flower at the same time as the Queensland arrowroot clone, allowing direct hybridisation. The flowers are naturally bird pollinated but can be easily hand pollinated and netted. This project has obtained around a half dozen wild species of Canna, including the likely ancestor C. discolor, the common weedy C. indica, and several ornamental strains that have dwarfing traits. These are being hybridised with the Queensland arrowroot strain to create a large F1 generation for field trials. From these trials and plants demonstrating enlarged tubers will be selected for further breeding work. Seed of self pollinated species, excess F1 seed and cuttings of the Queensland arrowroot clone will be available to those interested in participating.
Please email me at firstname.lastname@example.org as I havent been able to respond to peoples messages on the EFN webpage.
I hope this message finds you. The email system here still seems to be not quite functional, but hopefully soon.
The 2019 canna pollinating season is winding down. I am happy to report that my first generation hybrids of Queensland arrowroot (female) with a variety of male species (including mostly the giant altensteinii and the smaller/weedier indica) have performed well with hefty tubers on most of them. They were allowed to set seed from open pollination without many other neighbors so should mostly be intercrossed and self pollinated depending on compatibility. I have a fairly large amount of seed from these so can share small quantities with those interested in growing them out. Email me at email@example.com to organise. If you haven't grown canna from seed before I can also include some open pollinated altensteinii x indica hybrid seed for practice. The large seed germinate readily after having water at about 80 C poured over them then soaked overnight before sowing.
I have also been backcrossing the pollen from the queensland arrowroot hybrids back onto the pure queensland arrowroot. This has provided some seed but indicates there are some cytoplasmic self incompatibility issues. By contrast pollen from the reverse cross hybrid (Queensland arrowroot pollen on C. indica seed parent) has given much stronger seed set on female queensland arrowroot flowers. Good to know these issues when planning future crosses, though the ideal is to have a diverse population that sets seed readily without human intervention. I also have been crossing a few new species with Queensland arrowroot but quantities are too limited with these as well to share, but their offspring should be available in future to add genetic diversity to the project.
Hope to hear from you soon