Responses of Photosynthesis and Photosystem II to Higher Temperature and Salt Stress in Sorghum

Yan, K. and Chen, P. and Shao, H. and et al, . (2012) Responses of Photosynthesis and Photosystem II to Higher Temperature and Salt Stress in Sorghum. Journal of Agronomy and Crop Science, 198 (3). pp. 218-225.

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Gas exchange and chlorophyll a fluorescence transient were examined in leaves of sorghum under salt stress and high temperature. During salt treatment with 50 and 150 mm NaCl, photosynthetic rate (Pn) decreased, which could be ascribed to stomatal limitation. Salt stress had no effect on photosystem II (PSII) activity. At high temperatures, PSII function was inhibited in leaves of sorghum, indicated by the decrease in PSII performance index on absorption base and PSII maximal photochemistry efficiency (Fv/Fm); however, the decrease was lower in salt-treated sorghum, suggesting that salt adaption enhanced heat tolerance of PSII. The enhanced heat resistance can be expressed on all the components of PSII including reaction centre, donor side and acceptor side. Consistently, a slight decrease in Pn was found in salt-treated sorghum at high temperatures, indicating that salt adaption also enhanced heat tolerance of photosynthesis. Proline plays an important protective role in plant response to environmental stress, and its large accumulation in salt-treated sorghum might be the underlying reason leading to the enhanced heat tolerance. As for this pattern of photosynthetic response, sorghum seems to be a reliable crop species for human beings in the face of global warming and increasing salinity of agricultural land.

Item Type: Article
Additional Information: This work was jointly supported by One Hundred-Talent Plan of Chinese Academy of Sciences (CAS), The Opening Foundation of the State Key Laboratory of Crop Biology, Shandong Agriculture University (2011KF02), the CAS/SAFEA International Partnership Program for Creative Research Teams, National Natural Science Foundation of China (No. 41171216; 41001137; 31100313), the Science & Technology Development Plan of Shandong Province (2010GSF10208), the Science & Technology Development Plan of Yantai City (2011016;20102450), The Strategic Priority Research Program of the Chinese Academy of Sciences (XDA01020304) and Yantai Doublehundred Talent Plan (XY-003-02).
Uncontrolled Keywords: gas exchange;JIP test;proline;PSII activity
Author Affiliation: The CAS/Shandong Provincial Key Laboratory of Coastal Environmental Process, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences (CAS), Yantai, China
Subjects: Plant Production
Crop Improvement
Divisions: Sorghum
Depositing User: Mr Siva Shankar
Date Deposited: 01 Jun 2012 09:02
Last Modified: 01 Jun 2012 09:06
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