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photosynthetic properties of the mid-vein and leaf lamina of field-grown, high-yield hybrid rice during senescence

Journal of Integrative Agriculture 2022年第7期21卷 1913-1926页

作者： GAO Zhi-ping XU Min-li ZHANG Hai-zi Lü Chuan-gen CHEN Guo-xiang College of Life Sciences Nanjing Normal UniversityNanjing 210023P.R.China Institute of Food and Crops Jiangsu Academy of Agricultural SciencesNanjing 210014P.R.China

Previous studies with rice(Oryza sativa L.) have shown that the different components of the photosynthetic apparatus are not uniformly synthesized or degraded during senescence. However, while most of those studies have focused on the leaf lamina, few have addressed senescence-associated chloroplast function or leaf physiology. Here, we investigated the photosynthetic properties of the mid-vein and leaf lamina in a high-yield hybrid rice cultivar(Liangyoupei 9, LYP9) during the senescence stage. Assimilation and transpiration decreased more slowly in the mid-vein than in the lamina during senescence, suggesting more sustained photosynthesis in the mid-vein, as well as stronger heat dissipation. Two-dimensional gel electrophoresis suggested that photosynthesis and energy metabolism were less affected by senescence in the mid-vein than in the leaf lamina. During late senescence, the excess energy dissipation in the midvein through the xanthophyll cycle had a higher active photosynthetic capacity than in the leaf lamina, and we inferred that the mid-vein and leaf lamina of LYP9 rice differed in terms of their maturation. Taken together, these results provide new insights into the underlying mechanisms of senescence of the rice mid-vein and associated physiology.

关键词： mid-vein rice photosynthetic properties senescence

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The Changes of photosynthetic properties and Cell Microstructure in Peanut Leaves during Leaf Senescence

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Agricultural Sciences in China 2002年第4期1卷 410-416页

作者： LI Xiang-dong, WANG Xiao-yun, YU Song-lie, ZHANG Gao-ying, WAN Yong-shan and LI Jun(’ College of Agronomy Life Science Academy, Shandong Agricultural University, Taian 271018 , P.R. China) College of Agronomy Life Science Academy Shandong Agricultural University Taian 271018 P.R. China

The changes of photosynthetic properties and cell microstructure in peanut leaves during leaf senescence were studied with two high-yielding peanut cultivars (cv. Luhuall and Fu8707). The main results showed that during the whole process of leaf growth and senescence, changes in the photosynthesis rate (Pn) and contents of chlorophyll in leaves, could be described with a parabolic function, y = A + Bx + Cx2 (where y refers to the values of the above parameters and x to the days after leaf unfolding). During peanut leaf senescence , the shape of chloroplast changed gradually from long ellipses to circles.The starch globule in chloroplast altered gradually from more and larger sizes to fewer and smaller, but the oil globule from fewer and smaller to more and larger. The grana lamellae varied progressively: from thinness and length to thickness and shortness; from ranking along the long axle direction of chloroplast to disorderly arrangment and finally blurring. At last, the membrane envelope of chloroplast broke, so the inclusion seeped out to the cell and the chloroplast broke up.

关键词： Peanut Leaf senescence photosynthetic properties Cell microstructure

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Cloning and Characterization of the fecC Gene Necessary for Optimal Growth under Iron-Deficiency Conditions in the Cyanobacterium Anabaena sp. PCC7120

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Wuhan University Journal of Natural Sciences 2004年第4期9卷 498-502页

作者： xuwen-liang LIUYong-ding ZHANGCheng-cai LIJuan CollegeofLifeSciences CentralChinaNormalUniversityWuhan430079HubeiChina InstituteofHydrobiology ChineseAcademyofSciencesWuhan430072HubeiChina CollegeofLifeSciencesandTechnology HuazhongAgriculturalUniversityWuhan430070HubeiChina CollegeofLifeSciences CentralChinaNormalUniversityWuhan430079HubeiChina

ThefecC gene encoding a putative iron (III) dicitrate transporter was cloned from nitrogen-fixing cyanobacteriumAnabaena sp. PCC 7120, and inactivated. The mutant grows normally in medium with NO 3 ? , NH 4 + or without combined nitrogen. But in iron-deficient medium, the mutant grows slowly. photosynthetic properties were compared between the mutant and the wildtype strain, the content of photosynthetic pigments in the mutant is lower than that of the wild-type. The results of RT-PCR experiments show that thefecC gene is expressed under iron-deficient conditions, but is not expressed under iron-replete conditions. These results revealed thatfecC gene product is required for optimal growth under iron-deficient conditions inAnabaena sp. PCC 7120. Key words Anabaena sp. PCC 7120 - fecC - iron deficiency - photosynthetic properties - expression CLC number Q 933 Foundation item: Supported by the National Natural Sciences Foundation of China (30070154), the Frontier Science Projects Program of the Institute of Hydrobiology, the Chinese Academy of Sciences (220316), State Key Project on Cyanobacterial Bloom Control in Lake Dianchi (K99-05-35-01)Biography: XU Wen-liang (1974-), male, Ph. D, research direction: molecular genetics of cyanobacteria.

关键词： Anabaena sp. PCC 7120 fecC iron deficiency photosynthetic properties expression

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