THE RESPONSE OF MIDDAY DEPRESSION OF DIURNAL VARIATION OF NET PHOTOSYNTHETIC RATE OF WHEAT LEAVES ON ECOLOGICAL FACTORS IN THE FIELD ENVIRONMENT OF QINGHAI PLATEAU A Method of Quickly Extracting Total RNA from Wheat Leaves An Approach to a Function of Photorespiration in C3 Plants EFFECT OF LIGHT ON THE LOX ACTIVITY AND LIPID PEROXIDATION IN YOUNG WHEAT LEAVES UV-B Radiation Affects Protein Expression of the Wheat’s Leaf EFFECT OF DROUGHT STRESS ON THE RNase ACTIVITY AND de novo AYNTHESIS IN WHEAT LEAVES Changes of Ability of Scavenging Active Oxygen During Natural Senescence of Wheat Flag leaves