45 genotypes from rice germplasm were identified under photooxidation and shading condition and divided into four basic types: (l)cultivars tolerant to both photooxidation and shading,(2) cultivars tolerant to photooxidation but sensitive to shading,(3)cultivars tolerant to shading but sensitive to photooxidation, and (4) cultivars sensitive to photooxidation and shading.A comparative study of photosynthetic characteristics between cultivars c.v. differing photooxidation and shading sentivity from Wuyujing ...