The results showed that photosynthetic rate of flag leaf of Lumai 22 is higher than that of Lumai 14, and sucrose phosphate synthetase (SPS) activity in flag leaf of Lumai 22 is much higher than that of Lumai 14 during mid to late grain milking stage, which indicats higher photosynthate supplying rate of .

),dryland cultivar Changwu 134 (drought-resistant) and irrigated cultivar Shaan 253 (drought-sensitive),were applied to study the effects of soil drought (the soil water content was 50%-55% of the field water capacity) on photosynthate supplying rate (net photosynthetic rate and sucrose synthetic rate) and supplying duration of flag leaves.

The article puts forward that the core of petroleum strategy is to set up diversified petroleum sustainable supply system, which should consist of domestic petroleum exploration, development and supply system, foreign petroleum supply system and petroleum strategic reserves system.

Based on the analyses the authors suggested that its sustainable supply would contribute promotion of our country's economy healthy development.

A pulse xenon light source used for 3CCD camera photographic system is designed, the spectral features and trigger mode of the light source are introduced, and the important parameters including flash duration and flash frequency are also calculated.