Photosynthetic and physiological responses of foxtail millet (Setaria italica L.) to low-light stress during grain-filling stage
文献类型: 外文期刊
作者: Yuan, X. Y. 1 ; Zhang, L. G. 2 ; Huang, L. 1 ; Qi, X. 3 ; Wen, Y. Y. 1 ; Dong, S. Q. 1 ; Song, X. E. 1 ; Wang, H. F. 1 ; Guo 1 ;
作者机构: 1.Shanxi Agr Univ, Agron Coll, Key Lab Crop Chem Regulat & Chem Weed Control, Taigu 030801, Peoples R China
2.Shanxi Acad Agr Sci, Inst Crop Sci, Taiyuan 030032, Peoples R China
3.Yuncheng Agr Comm, Yuncheng 044000, Peoples R China
关键词: agronomic characteristics;chlorophyll content;chlorophyll fluorescence;photosynthetic physiology;yield
期刊名称:PHOTOSYNTHETICA ( 影响因子:3.189; 五年影响因子:3.38 )
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收录情况: SCI
摘要: Two foxtail millet (Setaria italica L.) varieties were subjected to different shading intensity treatments during a grain-filling stage in a field experiment in order to clarify physiological mechanisms of low-light effects on the yield. Our results showed that the grain fresh mass per panicle, yield, photosynthetic pigment contents, net photosynthetic rate, stomatal conductance, effective quantum yield of PSII photochemistry, and electron transport rate decreased with the increase of shading intensity, whereas the intercellular CO2 concentration increased in both varieties. In addition, shading changed a double-peak diurnal variation of photosynthesis to a one-peak curve. In conclusion, the lower yield of foxtail millet was caused mainly by a reduction of grain mass assimilated, a decline in chlorophyll content, and the low photosynthetic rate due to low light during the grain-filling stage. Reduced light energy absorption and conversion, restricted electron transfer, and reduced stomatal conductance might cause the decrease in photosynthesis.
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