Study on the difference of rice genotypes tolerant to low phosphorus stress in the seedling stage

Responses of 38 rice(Oryza sativa L )cultivars to low phosphorus environment were preliminarily evaluated by means of a controlled system with insoluble phosphorate source(Ca₃(PO₄)₂)in liquid phase The results show a significant genotypic variation tolerant to P deficiency in the tested 16 rice germplasms，indicating that“Shanyou63”，“IR74”，“Shanyoul61”．“IR70617-4B-B19-2”and“IR64”are the most tolerant type，“IR70651-3B-3-2-2-2”，“IR71331-2B-2-1”．“Namchuan”．“IR71379-2B-10-2-3-1”and “IR72413-3R-26-2”are more sensitive genotypes，but“IR73384-1l-7-8-3-2-3-3-3”， “IR73382-111-9-19-19-2-3-1-2”， “IR72417-3R-6-2”， “IR36”， “IR72417-3R-8-3” and “IR72412-3R-l1-3”are the moderate type in terms of tolerance to P deficiency．