Search

Start Over Creator Dong, S. Q. Subject 581 Subject chlorophyll fluorescence

1. Photochemical changes and oxidative damage in four foxtail millet varieties following exposure to sethoxydim

Creator:
Guo, M. J., Wang, Y. G., Dong, S. Q., Wen, Y. Y., Song, X. E., and Guo, P. Y.
Format:
print, bez média, and svazek
Type:
model:article and TEXT
Subject:
chlorofylová fluorescence, parametry P700, reaktivní formy kyslíku, proso, chlorophyll fluorescence, P700 parameters, reactive oxygen species, spring hybrid millet, 2, and 581
Language:
Multiple languages
Description:
In order to assess its response to the herbicide, sethoxydim (SEY), seedlings of two foxtail millet (Setaria italica) hybrids were exposed to 0.75, 1.5, 3, and 6 L(SEY active ingredient, ai) ha-1 for 7 and 15 d. Our results showed that SEY reduced photosynthesis and oxidative stress in the hybrid millet (Zhangza) at the dosage below 1.5 L(ai) ha-1 (i.e., recommended dosage), whereas it caused death of Jingu 21 at all treatment dosages. In addition, we further explored the effect of SEY on PSI and PSII; the hybrid millet showed a greater tolerance to SEY and also the ability to recover. In conclusion, the hybrid millet seems to possess certain photosynthetic protection mechanisms which could reduce or eliminate the herbicide stress by increasing nonphotochemical quenching for dissipating excessive light energy under SEY-induced oxidative stress., M. J. Guo, Y. G. Wang, S. Q. Dong, Y. Y. Wen, X. E. Song, P. Y. Guo., and Obsahuje bibliografii
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

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

Creator:
Yuan, X. Y., Zhang, L. G., Huang, L., Qi, X., Wen, Y. Y., Dong, S. Q., Song, X. E., Wang, H. F., and Guo, P. Y.
Format:
print, bez média, and svazek
Type:
model:article and TEXT
Subject:
agronomické charakteristiky, obsah chlorofylu, fluorescence chlorofylu, sklizeň, bér italský, agronomic characteristics, chlorophyll content, chlorophyll fluorescence, photosynthetic physiology, yield, foxtail millet, Setaria italica, low-light stress, 2, and 581
Language:
Multiple languages
Description:
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., X. Y. Yuan, L. G. Zhang, L. Huang, X. Qi, Y. Y. Wen, S. Q. Dong, X. E. Song, H. F. Wang, P. Y. Guo., and Obsahuje bibliografii
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public