7Yoshida S. Physiological aspects of grain yield[J]. Annual Review of Plant Physiology, 1972(23):437-464.
8Thomas H, Howarth C J. Five ways to stay green[J]. Experimental Botany,2000(51 ):329-337.
9Araus J L, Luis T. Photosynthetic gas exchange characteristics of wheat flag leaf blades and sheaths during grain filling[J]. Plant Pbysiol, 1987(85):667-673.