Abstract: In this article the limit Environment factors and diagnosis methods of flag leaf photosynthetic pro ductivity were studied in wheat ( Triticum aestivum L. ) in powerful radiation and high temperature conditions. Using continuous measuring the net photosynthetic rates and air relative humid (RH) and photosynthetic availability radiation (PAR) and air CO2 concentration and temperature (Tair) changing in the field, calculating the correlation coefficients between net photosynthetic rates and these environment factors changing in powerful radiation and high temperature conditions, the photosynthetic productivity limit factors of photosynthesis were determined. According to the correlation coefficients between net photosynthetic rates and air relative humid (RH) or photosynthetic availability radiation (PAR) or air CO2 concentration or temperature (Tair) changing in the field, the diurnal variation of photosynthesis can be divided RH restrict model,RH-CO2 restrict model, PAR-RH restrict model and PAR restrict model. It is important to study restrict photosynthesis factors and evaluate wheat varieties resistance to high temperature, powerful radiation conditions in the field.

Key words: Wheat Flag leaf, Photosynthetic productivity, Environment factor

CLC Number: 

• S512.01