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Relationships between phosphatidylglycerol Molecular Species of Thylakoid Membrane Lipids and Sensitivities to Chilling-induced Photoinhibition in Rice

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Journal of Integrative Plant Biology 2008年第2期50卷 194-202页

作者： Su-Qin Zhu Hua Zhao Jian-Sheng Liang Ben-Hua Ji De-Mao Jiao College of Bioscience and Biotechnology Yangzhou University Yangzhou 225000 China Institute of Bioengineering Nantong University Nantong 226007 China College of Life Sciences Nantong University Nantong 226007 China Institute of Agrobiological Genetics and Physiology Jiangsu Academy of Agricultural Sciences N anjing 210014 China

In an attempt to explore the relationships between phosphatidylglycerol （PG） molecular species of thylakoid membrane lipids and sensitivities to chilling-induced photoinhibition, PG molecular species, D1 protein, electron transport activities of thylakoid membrane and the potential quantum yield （FvlFm） in rice treated under middle and low photon flux density （PFD） at 11℃ were analyzed by high performance liquid chromatography, enzyme hydrolysis, gas phase chromatography （GC） and so on. Results showed that the major molecular species of PGs in rice thylakoid membrane were 18：3/16：0, 18：3/16：1（3t）, 18：2/16：0, 18：2/16：1（3t）, 18：1/16：0, 18：1/16：1（3t）, 16：0/16：0, 16：0/16：1（3t）. There were large differences in the contents of unsaturated PG molecular species such as 18：1-3/16：0-16：1（3t） and saturated PG molecular species like 16：0/16：0-16：1（3t） among japonica cv 9516 0-9516）, japonica-indica hybrid F1 j-9516/i-SY63 （ji-95SY） and indica cv Shanyou 63 （i-SY63）. J-9516 containing higher contents of unsaturated PG molecular species was manifest in stable D1 protein contents under chill and tolerant to chill-induced photoinhibition. In contrast to j-9516, i-SY63 with lower contents of unsaturated PG molecular species, exhibited unstable D1 protein contents under chill and was sensitive to chill-induced photoinhibition, ji-95SY containing middle contents of unsaturated PG molecular species between those of j-9516 and i-SY63, exhibited mid extent of sensitivity to chill-induced photoinhibition. The losses in D1 protein also account for the inhibition in electron transport activity of thylakoid membrane and the observed decline in FvlFm. The PG molecular species that is efficient in raising chilling-resistant capacity were those containing unsaturated fatty acids, namely, unsaturated PG molecular species. These results implied that the substrate selectivity of the glycerol-3-phosphate acyltransferase in chloroplasts towards 16：0 or 18：1 displayed greatly the difference between j

关键词： chilling-induced photoinhibition D1 protein molecular species phosphatidylglycerol rice.

Relationship Between Thermal Phase Transition of phosphatidylglycerol and Cold Resistance of Rice

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Chinese Science Bulletin 1994年第23期39卷 2009-2013页

作者：杨岭苏维埃 Biology Department of Zhejiang Teachers Universith Jinhua 321004PRC Shanghai Institute of Plant Physiology Academia Sinica Shanghai 200032 PRC

PG constitutes 3%—5% lipids of plant thylakoid *** was said that the more saturated PG in cold sensitive plant might cause phase transition of whole membrane at the chilling *** differences in PG fatty acid

关键词： phosphatidylglycerol (PG) differential scanning calorimetry electron spin resonance cold resistance.

Effect of phosphatidylglycerol on conformation and microenvironment of tyrosyl residue in photosystem II

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Science China(Life Sciences) 2000年第3期43卷 330-336页

作者：阳振乐李良璧许亦农匡廷云 Photosynthesis Research Center Institute of Botany Chinese Academy of Sciences Beijing 100093 China

The structural aspects in the interaction of phosphatidylglycerol (PG) with photosystem II (PSIl), mainly the effect of PQ on conformation and microenvironment of tyrosine residues of PSIl proteins were studied by Fourier transform infrared (FTIR) spectroscopy. It was found that the binding of PG to PSIl particle induces changes in the conformation and micropolarity of phenol ring in the tyrosine residues. In other words, the PG effect on the PSIl results in blue shift of the stretch vibrational band in the phenol ring from 1620 to 1500 cm-1 with the enhancement of the absorb-ance intensity. Additionally, a new spectrum of hydrogen bond was also observed. The results imply that the hydrogen-bond formation between the OH group of phenol and one of PG might cause changes in the structures of tyrosine residues in PSIl proteins.

关键词： photosystem II phosphatidylglycerol tyrosine residue Fourier transform infrared spectroscopy.