EFFECT OF SPRAYING BLUE GREEN ALGAE (CYANOBACTERIA) EXTRACTS ON HYBRID RICE SEED PRODUCTION

Abstract

Two isolates of cyanobacteria (Anabaena oryzae, Nosto centophytum) were isolated from agricultural wastewater from the experimental farm of Sakha Research Station, Sakha, Kafr EL Sheikh, Egypt for testing their ability to fix atmospheric nitrogen and produce hormones and its effect on hybrid rice seed production by spraying the isolates extract and their mixture on the rice plants. Isolates were varied in their capacity in the extracellular-nitrogen, Intracellular secreted, produce hormones and dry weight of the cyanobacteria isolates (mg/100 ml-culture) where the lowest content was for isolate Anabaena oryzae and the highest was for Nostoc centophytum and mixture. The aim of the present investigation is to identify the effect of cyanobacteria extract isolated from Egyptian waste water on hybrid rice seed production. The used cytoplasmic male sterile lines were IR69625A and G46A and the restorer line was G.178. Application of mixture between Anabaena oryzae and Nostoc centophytum produced the highest values in most studied characters such as seed yield in both seasons.