Hello, I tried to get some cuttings of tetraploids that I saw in local fields of seedless watermelons, but they all died. I saved some seed from the fruit as well and will grow out a small sample of it to see if it was a self or a cross. Self will be 4n and cross will be 3n. Jonny
Post by terracotta on Feb 18, 2012 13:39:42 GMT -5
any thoughts on a variety of watermelon to be chromosome doubled? doubling reduces male fertility so one that grow many male flowers would be a plus to begin with. current varieties I have
crimson sweet (lots of info on how it would look so better ID of tetraploidy)
allsweet (The third highest lycopene content and a pollinator)
sugar baby (already done by someone else with poor results)
some kind of bush type (low germination and vigor for me but if someone else wants to run with it go ahead it would generate more seedless melons per acre which is what people are trying to do with pollinator varieties)
Any chemical that can induce doubling of ploidy has got to be reasonably unpleasant I would have thought. It's a matter of bad versus really bad. Joseph was using a herbicide, can't remember its name, which is less nasty than colchicine but still quite an unpleasant chemical. Physical damage can sometimes lead to doubling of ploidy but that's a rather hit and miss affair, if you'll pardon the rather poor pun.
Ray Silty loam over clay, pH 5.5, altitude 1000m, latitude 30deg south, 150 frost free days.
Post by Wood-N-Stake on Feb 18, 2012 19:14:42 GMT -5
The seed world is full of diploid and triploid watermelon. The Asian seed companies have a huge selection. Only problem is getting the seeds into the USA. The Asian market demand for melon seems much higher thane the US. Their solution to production seems to be heading toward grafting. I would tend to agree with grafting. It is new for cucurbits, but, not a new solution for fruit production.
Super cool would be a perennial root stock to graft to. The current procedure is to start the root stock 7 - 10 days before the graft stock. Having an established root stock would really boost survival and production.
Hi All This is a very interesting topic. I have contemplated doing some conversions myself. I think that Surflan has also been used to induce polyploidy. Colchicine is not a good idea for people to work with unless they have proper equipment and use proper protection. Orazylin and Surflan are both herbicides, while certainly not safe, are probably much safer to work with than colchicine. Polyploids aren't all less productive, many of our crop plants are polyploid...potato-4N, strawberry 8N, wheat 6N, the list goes on....each species has its own quirks and adaptations making it difficult to generalize about polyploids. And...all those Phalaenopsis (orchids) you find at "Trader Joe's" are tetraploids.... Jim