Drought Stress in Flowering Period on Photosynthetic Characteristics of Soybean Varieties of Different Bred Years in Heilongjiang Province
In order to research drought stress in flowering period on photosynthetic characteristics of soybean varieties of different bred years in Heilongjiang Province,5 representative soybean varieties bred in 1985-2010 were taken as the test materials and the author set mild-stress (the field maximum water-holding capacity 55％-60％),serious-stress (the field maximum water-holding capacity 35％-40％) and normal (the field maximum water-holding capacity 75％-80％) in flowering period to analyze the photosynthetic characteristics.The results showed that the leaf area per plant,leaf color value,net photosynthetic rate and grain weight per plant of soybean varieties of different bred years presented a declining trend as the drought intension enhanced and had declining differences.Under the drought stress conditions and as varieties bred time went on,the leaf area per plant,leaf color value,net photosynthetic rate and grain weight per plant presented a general increasing trend firstly and then decreased.Under the mild drought condition,the declining percentages of per plant leaf area,leaf color value,net photosynthetic rate and grain weight per plant associated with bred years reached significant or extremely significant levels (R2=0.7673*,R2=0.8410*,R2=0.9045**,R2=0.9872**),under the severe drought condition,declining percentage of per plant leaf area was not significantly related to the bred years (R2=0.6057),the declining percentages of leaf color value,net photosynthetic rate and grain weight per plant associated with bred years reached extremely significant level (R2=0.9775**,R2=0.9332**,R2=0.9699**).From the variation trend of the leaf area per plant,leaf color value,net photosynthetic rate and grain weight per plant,it was obvious that with the varieties ' genetic improvement,the drought resistance ability of soybean varieties of different bred years in Heilongjiang Province showed a general trend of first decrease and then increase.
国家科技期刊平台
NSTL
万方数据
维普
