factors Affecting life cycle of Uromyces vignae The causal fungus of cowpea rust

[59]

Galal¹, A.A.; EL-S. Abdou¹; H.M. Abd-Alla and Hanaa M. Hassan¹

ABSTRACT

Five stages of cowpea rust fungus Uromyces vignae were recorded throughout this study. Teliospores were successfully germinated to produce basidiospores after 2 months incubation even without any treatment. Germination of teliospores was more pronounced in attached teliospres than detatched ones and variously affected by treatment with some chemical substances and animal’s manure. Indole acetic acid and acetic acid had inhibitory effect on spore germination, while adenosine tri-phosphate (ATP), ferulic acid (FA), gibberellic acid (GA3) and kinetin reacted as stimulators of teliospore germination. Combining these substances with cows or donkey's manure increased, not only, the teliospore germination, but also increase the pycnia and aecia formation. Insignificant effect for these subtances was observed on aeciospore infectivity.