Photosynthetic compensation of maize in heterogeneous light is impaired by restricted photosynthate export

Copyright © 2022 Elsevier Masson SAS. All rights reserved.

Détails bibliographiques
Publié dans:Plant physiology and biochemistry : PPB. - 1991. - 192(2022) vom: 01. Dez., Seite 50-56
Auteur principal: Huang, Si-Rong (Auteur)
Autres auteurs: Ai, Yuan, Du, Jun-Bo, Yu, Liang, Wang, Xiao-Chun, Yang, Wen-Yu, Sun, Xin
Format: Article en ligne
Langue:English
Publié: 2022
Accès à la collection:Plant physiology and biochemistry : PPB
Sujets:Journal Article Heterogeneous light Maize (Zea mays L.) Nitrogen distribution Photosynthate export Photosynthetic compensation
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520 |a When a plant is exposed to heterogeneous light, the photosynthesis of unshaded leaves is often stimulated to compensate for the decline in photosynthesis of shaded leaves, i.e., photosynthetic compensation. However, a decline of photosynthesis in unshaded leaves, which means an impairment of photosynthetic compensation, has also been widely reported. Herein, two cultivars of maize (Zea mays L.), 'Rongyu1210' (RY) and 'Zhongdan808' (ZD), were studied comparatively. Both cultivars performed evident photosynthetic compensation under heterogeneous light (HL) as the light phase begins (8:30 a.m.). However, as the light phase continues (10:30 a.m.), an impairment of photosynthetic compensation took place in HL-treated ZD, but not in HL-treated RY. For both cultivars, nitrogen content of unshaded leaves was higher under HL, indicating a preferential nitrogen distribution towards unshaded leaves. This is related to the photosynthetic compensation but not the cause of the impairment. In addition, no obvious difference was found in the response of photosynthates (sucrose and starch) to HL between cultivars at 8:30 a.m. However, at 10:30 a.m., the content of photosynthates decreased significantly in unshaded leaves of HL-treated RY, along with increased abundances of both sucrose transporters (SUTs) and H+-ATPase (EC 7.1.2.1). In contrast, it increased along with decreased abundances of SUTs and H+-ATPase in HL-treated ZD. These results suggest that the photosynthetic compensation is impaired when photosynthates export of unshaded leaves is restricted. This suggestion is further confirmed by the results of 13C labeling and dry weight detection on young leaves as 'sink' 
650 4 |a Journal Article 
650 4 |a Heterogeneous light 
650 4 |a Maize (Zea mays L.) 
650 4 |a Nitrogen distribution 
650 4 |a Photosynthate export 
650 4 |a Photosynthetic compensation 
700 1 |a Ai, Yuan  |e verfasserin  |4 aut 
700 1 |a Du, Jun-Bo  |e verfasserin  |4 aut 
700 1 |a Yu, Liang  |e verfasserin  |4 aut 
700 1 |a Wang, Xiao-Chun  |e verfasserin  |4 aut 
700 1 |a Yang, Wen-Yu  |e verfasserin  |4 aut 
700 1 |a Sun, Xin  |e verfasserin  |4 aut 
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773 1 8 |g volume:192  |g year:2022  |g day:01  |g month:12  |g pages:50-56 
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