期刊
JOURNAL OF PLANT PHYSIOLOGY
卷 171, 期 6, 页码 411-420出版社
ELSEVIER GMBH
DOI: 10.1016/j.jplph.2013.12.005
关键词
Chlorophyll fluorescence; Fatty acid saturation; Gossypium hirsutum; Leaf expansion; Photosynthetic thermotolerance
资金
- NSF-EPSCoR
- Arkansas Science and Technology Authority [EPS 1003970]
- Cotton Incorporated
- University of Central Arkansas Sponsored Programs Fund
- U.S. Department of Energy, Office of Science, Basic Energy Sciences [DE-FG02-05ER15647]
- Office Of The Director
- EPSCoR [1003970] Funding Source: National Science Foundation
In this project, we hypothesize that cotton (Gossypium hirsutum) leaf temperature and the responses of leaf photosynthesis to temperature will change as the leaves expand and that differences between young and mature leaves will be associated with the proportion of saturated fatty acids in thylakoid and other membrane lipids. To that end, we studied main stem leaves obtained from plants growing in a temperature controlled greenhouse and at different times in the field season. We found that young leaves (similar to 5 d old) had higher mid day temperatures, lower stomatal conductance and higher thermal optima as measured by Phi(PSII) temperature curves than did more mature leaves (similar to 13 d old). Young leaves also had significant differences in fatty acid saturation with the warmer, young leaves having a higher proportion of palmitic acid (16:0) and lower linoleic acid (18:3) in total lipid extracts and higher 16:0 and lower palmitoleic acid (16:1) in the chloroplast membrane phosphoglycerides, digalactosyldiacylglycerol (in the greenhouse) and phosphatidylglycerol when compared with cooler, more mature leaves. Later in the growing season, leaf temperature, stomatal conductance and Phi(PSII) temperature curves for young and more mature leaves were similar and the proportion of 16:0 fatty acids decreased and 16:1 increased in phosphatidylglycerol. We conclude that changes in temperature as cotton leaves expand leads to alterations in the fatty acid composition of thylakoid and other membranes and, consequently, influence photosynthesis/temperature responses. (C) 2013 Elsevier GmbH. All rights reserved.
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