Photo inhibition and Recovery of Photosyn thesis in Pear Leaves PHOTOINHIBITION OF PHOTOSYNTHESIS OF ATTACHED LEAVES IN POPLAR CLONE SEEDLINGS Characteristics of CO2 Exchange and Chlorophyll Fluorescence of Transgenic Rice with C4 Genes Photochemical Efficiency of PSⅡ and Characteristics of Photosynthetic CO2 Exchange in Indica and Japonica Subspecies of Rice and Their Reciprocal Cross F1 Hybrids Under Photoinhibitory Conditions Photo inhibition and Recovery of Photosyn thesis in Pear Leaves Technical Principle of Massive Screening of Rice Germplasm for Tolerance of Photoinhibition and It’s Application Effects of growth light intensities on photosynthesis in seedlings of two tropical rain forest species