Photosynthetic and physiological responses of foxtail millet (Setaria italica L.) to low-light stress during grain-filling stage

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, yie...

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Bibliographic Details
Published in:Photosynthetica 2017-09, Vol.55 (3), p.491-500
Main Authors: Yuan, X. Y., Zhang, L. G., Huang, L., Qi, X., Wen, Y. Y., Dong, S. Q., Song, X. E., Wang, H. F., Guo, P. Y.
Format: Article
Language:English
Subjects:
Biomedical and Life Sciences
Carbon dioxide
Chlorophyll
Conductance
Diurnal
Electron transfer
Electron transport
Energy absorption
Grain
Life Sciences
Light effects
Millet
Original Paper
Photochemistry
Photosynthesis
Photosystem II
Physiological effects
Physiological responses
Physiology
Plant Physiology
Resistance
Shading
Stomata
Stomatal conductance
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Summary: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 CO 2 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.
ISSN:0300-3604
1573-9058
DOI:10.1007/s11099-016-0645-4