|Destiny, Robert, Artemis, Sentinel and Nighthawk.|
|Close up of Striga shoots on Artemis|
On a more cheerful note, I have had one recent success. Until now, I have been having terrible trouble getting the S. gesnerioides seed that I do have to germinate properly: the maximum I ever reached was 30% germination. This was probably because I was using an artificial chemical called GR24, which is actually a germination stimulant for the related species Striga hermonthica. So I decided to take a step back to nature…. unlike S. hermonthica, which infects cereal crops such as maize, the original host for S. gesnerioides is cowpea. In their native soil, the parasite seeds germinate in response to chemicals naturally released by the cowpea roots (a handy trick to ensure they only germinate when a suitable host is present!). Although the exact chemical/s Striga responds to are unknown, this needn’t stop me from trying the same thing! Consequently, I have been growing cowpea hydroponically and taking samples from the liquid every few days. I was amazed at how well the cowpea took to it, given that the only support they had was a tube in a rack with the end sawn off. Even better, since using the cowpea extract, the germination rates have shot up to over 50%. It’s a good lesson in putting a problem back into the context it came from.
|My super-hyrdroponic cowpea plants!|