Changes in Unsaturated Levels of Fatty Acids in Thylakoid PSII Membrane Lipids During Chilling‐induced Resistance in Rice

作者：Suqin Zhu, Chunmei Yu, Xin‐Yan Liu, JI Ben-Hua, De‐Mao Jiao · 发表于：Journal of Integrative Plant Biology · 年份：2007 · DOI：10.1111/j.1744-7909.2007.00438.x · 被引用次数：15 · 研究领域：Photosynthetic Processes and Mechanisms、Plant Stress Responses and Tolerance、Mitochondrial Function and Pathology

Abstract Temperature is one of the abiotic factors limiting growth and productivity of plants. In the present work, the effect of low non‐freezing temperature, as an inducer of “chilling resistance”, was studied in three cultivars of rice ( Oryza sativa L.), japonica cv. 9516 (j‐9516), the two parental lines of superhigh‐yield hybrid rice between subspecies, Peiai/E32 (ji‐PE), and the traditional indica hybrid rice Shanyou 63 (i‐SY63). Leaves of chill‐treated rice showed chilling‐induced resistance, as an increase of their low‐temperature tolerance was measured using chlorophyll fluorescence measurements, revealing a change in photosystem II (PSII) efficiency. After 5 d of exposure to 11°C under low light (100 μmol m ‐2 s ‐1 ), levels of unsaturated fatty acids in PSII thylakoid membrane lipids decreased during the initial 1‐2 d, then increased slowly and reached 99.2%, 95.3% and 90.1% of the initial value (0 d) in j‐9516, ji‐PE and i‐SY63, respectively, on the fifth day. However, under medium light (600 μmol m ‐2 s ‐1 ), all cultivars experienced similar substantial photoinhibition, which approached steady state levels after a decline in levels of unsaturated fatty acids in PSII thylakoid membrane lipids to about 57.1%, 53.8% and 44.5% of the initial values (0 d) in j‐9516, ji‐PE and I‐SY63 on the fifth day. Under either chilling‐induced resistance (the former) or low temperature photoinhibition (the latter) conditions, the changes of other physiological parameters such as D...