Physiological Analysis and Cytological Observation of the Wheat Mutant with Yellow Green-revertible Flag Leaf Photosynthetic Characteristics and Chlorophyll Fluorescence Kinetic Parameters Analyses of Chlorophyll-Reduced Mutant in Brassica napus L. Genetic Dissection of Photosynthetic Pigment Content in Cotton Interspecific Chromosome Segment Introgression Lines Growth,Physiological and Biochemical Characteristics of Tamarix chinensis Seedlings under Salt-drought Intercross Stress Photosynthetic characteristics of wheat cultivars with blue or purple grain