I'm totally newby at breeding but why not trying something hard but very promising with Phaseolus polystachios (syn Dolichos polystachyus). As there is a bunch of talented persons here, it can be very interesting to discuss about it. I honestly dont know where i am going, but at least someone could benefit from discussion and findings that will be put in this thread.
Goal is to get a perennial bean for USDA zone 7 or lower with decent yield or pod size. Obsviously i will start from Phaseolus polystachios hoping the seeds i just get will sprout and trying to cross it
I Would like to work on some breeding too. I planted two P. polystachios plants last spring, and they lived through the season. Unfortunately they did not flower. If they survive this winter I might have some flowers and maybe some seeds to grow out. Hopefully yours will set seed their first year, but I am not sure if that can happen. I will leave an update on what happens in the spring.
If someone with better access to scientific paper than me get this paper it should be interesting:
Le Marchand G, Marechal R, Baudet JC. 1976 Observations sur quelques hybrides dans le genre Phaseolus: 3. P. lunatus: nouveaux hybrides et considerations sur les affinites interspecifiques. (Observations on some Phaseolus hybrids: 3. P. lunatus: new hybrids and considerations on the interspecific affinities.) Bull. Rech. Agron. Gembloux, 11. (1 - 2): 183 - 199 (1976) - illus. (En) Geog=1 Systematics: ANGIOSPERMAE (LEGUMINOSAE: PHASEOLUS) (KR, 197703293).
And another question, are there advantages to make a P lunatus x P polystachios cross instead of P poly x P lunatus ?
The cross P. polystachyus O x P. lunatus $ was attempted an estimated 50 times with no success, but an estimated 100 attempts to effect the reciprocal cross resulted in the production of seven F, plants for which there is objective evidence that these are bona fide hybrids, although none of the plants has yet matured to the point of flower and seed production.
All the hybrids expressed completely or nearly com- pletely the hypogaeal germination habit of the statni- nate, P. polystachyus parent. I n two out of the seven a tendency toward the epigaeal habit of the pistillate parent was expressed by the slight elevation of the cotyledons to a level barely above the surface of the soil. With deeper planting this might even have escaped observation. I n a Lima control the cotyledons were elevated to a height of 3 in.
So now we have a method to spot hybrids very fast, great !
The principal objective of the P. lunatus x P. poly- stachyus cross has been to incorporate into the former species the hypogaeal germination habit of the latter in an attempt to solve the emergence problem in Limas, where a high mortality among seedlings is likely to result from the breaking of the hypocotyl ("neck-breaking")
Great to see why see crosses was made and a new quality of the polystachios bean that is transmitted to the offsprings
Apart from consideration of this one obviously valuable germination character is the possibility that a native species, such as P. polystachyus, having a comparatively wide geographic distribution, may possess yet unrecognized resistances to diseases and pests and may also possess physiological attributes of survival value. According to Small ( I ) , P. poly- stachyus ranges from Florida as far north as Minne- sota, Ontario, and Maine and as far west as -.Texas and Nebraska, so it seems apparent that the perennial rootstock a t least has some degree of cold-hardiness even though the plant usually occurs in protected locations..
The main problem is sterility, that was not spotted in the article ("none of the plants has yet matured to the point of flower and seed production.") and maybe the difficulty of the cross 7% success)
Ok so now we've got :
* P lunatus x P polystachios can be made * A method to spot hybrids * A sucess rate * A problem of sterility but that seems not so bad even if i still have to figure out what happening cause i miss some biology notions
As "cytoxxxxx" and "xxxdiploid" appears a lot in the scientific litterature of this cross. But for now i'm just lost in these notions of biology. i'm in the scientific paper search phase. It could be the key to produce fertile hybrids ?
To be noted, old publications refers to polystachios as polystachyus, a good tip to know to search.
So let's say that you have a P. Lunatus x P. Polystachios. Would the P. Lunatus (first listed parent) be the female parent and the P. Polystachios (second listed) be the pollen donor? Still learning here...