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

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Photosynthetica

Abstract

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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Abbreviations

Car:

carotenoid

Chl:

chlorophyll

C i :

intercellular CO2 concentration

CK:

control

DAS:

days after sowing

E :

transpiration

ETR:

electron transport rate

F0 :

minimal fluorescence yield of the dark-adapted state

Fm :

maximum fluorescence yield of the dark-adapted state

FM:

fresh mass

Fm':

maximal fluorescence yield of the light-adapted state

Fs :

steady-state fluorescence yield

Fv/Fm :

maximum quantum yield of PSII photochemistry

g s :

stomatal conductance

P N :

net photosynthetic rate

SP:

saturation pulses

ФPSII :

effective quantum yield of PSII photochemistry

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (31301269), the National Science and Technology Support Plan of China (2014BAD07B01), the Scientific and Technological Project of Shanxi Province (20150311016-2), the Key Scientific and Technological Project of Shanxi Province (2015-TN-09), and the Program for the Top Young Innovative Talents of Shanxi Agricultural University (TYIT201406). Special thanks to Prof. Dr. J.A. Dille and Chelsea Ahlquist of Kansas State University for English improvement of the manuscript.

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Correspondence to X. Y. Yuan.

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Yuan, X.Y., Zhang, L.G., Huang, L. et al. Photosynthetic and physiological responses of foxtail millet (Setaria italica L.) to low-light stress during grain-filling stage. Photosynthetica 55, 491–500 (2017). https://doi.org/10.1007/s11099-016-0645-4

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