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Dynamic study of photosensitized one-electron oxidation of polyG by menadione

Science china Chemistry 2005年第4期48卷 292-296页

作者： ma jianhua1.lin weizhen2.du fuqiang2,han zhenhui2,yao side2 & lin nianyun2.1.college of biology engineering,jimei university,xiamen 361.2.,china 2.Laboratory of Nanobiomedicine & Laboratory of Radiation Chemistry,Shanghai Institute of Applied Physics,Chinese Acade Sciences,Shanghai 2.1800,china 1. college of biology engineering Jimei University 361021 Xiamen China 2. Laboratory of Nanobiomedicine & Laboratory of Radiation Chemistry Shanghai Institute of Applied Physics Chinese Academy of Sciences 201800 Shanghai China

The electron transfer reaction of triplet menadione (3MQ?) with polyguanylic acid (polyG) in CH3CN rich (97%) solution was investigated by 248 nm(KrF) laser flash *** transient absorption spectra and kinetics obtained from the interaction of 3MQ? with polyG demonstrated that the primary radical ion pair,radical cation of polyG and radical anion of me-nadione can be detected *** results demonstrated that the reaction rate con-stant of 3MQ? with polyG is almost equal to that of 3MQ? with dGMP.

关键词： menadione, polyG, laser flash photolysis, triplet state, one electron oxidation.

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Electron Transfer Reaction Between Desoxyadenosine and Triplet 2-Methyl-1,4-naphthaquinone:A Laser Photolysis Study

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Chemical Research in Chinese Universities 2006年第3期22卷 397-399页

作者： ma Jian-hua lin Wei-zhen han Zhen-hui yao Si-de lin Nian-yun college of biology engineering Jimei University Xiamen 361021 P. R. China Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 P. R. China

Introduction Electron transfer oxidation of DNA by triplet artificial photonuclease reveals a bright prospect of its application in biology and medicine. Both molecular orbital calculation and laser experiments have indicated that the homo guanine sequence should be the final localization site of photoexcited hole via long range migration within DNA. However, the direct observation of the produced ion pairs of biomolecules especially the stabilized radical cation DNA or its components is hampered by the overwhelming transient absorption of protonated radical anion of photosensitizers, such as 2-methyl-1,4-naphthaguinonel （MQ）.

关键词： Electron transfer reaction 2-Methyl-1,4-naphthaquinone Desoxyadenosine Laser photolysis

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Unraveling a genetic roadmap for improved taste in the domesticated apple

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Molecular Plant 2021年第9期14卷 1454-1471页

作者： Liao Liao Weihan Zhang Bo Zhang Ting Fang Xiao-Fei Wang Yarning Cai Collins Ogutu Lei Gao Gang Chen Xiaoqing Nie Jinsheng Xu Quanyan Zhang Yiran Ren Jianqiang Yu Chukun Wang Cecilia H.Deng Baiquan ma Beibei Zheng Chun-Xiang You Da-Gang Hu Richard Espley Kui lin-Wang Jia-Long yao Andrew C.Allan Awais Khan Schuyler S.Korban Zhangjun Fei Ray Ming Yu-Jin Hao Li Li Yuepeng han CAS Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture Hubei Hongshan LaboratoryWuhan Botanical GardenThe Innovative Academy of Seed DesignChinese Academy of SciencesWuhan 430074China Agricultural Bioinformatics Key Laboratory of Hubei Province College of InformaticsHuazhong Agricultural UniversityWuhan 430070China Center of Economic Botany Core Botanical GardensChinese Academy of SciencesWuhan 430074China university of Chinese Academy of Sciences 19A YuquanluBeijing 100049China college of Horticulture Science and engineering Shandong Agricultural UniversityTai-An 271018China Sino-African Joint Research Center Chinese Academy of SciencesWuhan 430074China The New Zealand Institute for Plant&Food Research Limited AucklandNew Zealand School of Biological Sciences University of AucklandPrivate Bag 92019Auckland 1142New Zealand Plant Pathology and Plant-Microbe biology Section Cornell UniversityGenevaNY 14456USA Department of Natural Resources and Environmental Sciences University of Illinois at Urbana-ChampaignUrbanaIL 61801USA Boyce Thompson Institute Cornell UniversityIthacaNY 14853USA Department of Plant biology University of Illinois at Urbana-ChampaignUrbanaIL 61801USA

Although taste is an important aspect of fruit quality, an understanding of its genetic control remains elusive in apple and other fruit crops. In this study, we conducted genomic sequence analysis of 497 malus accessions and revealed erosion of genetic diversity caused by apple breeding and possible independent domestication events of dessert and cider apples. Signatures of selection for fruit acidity and size, but not for fruit sugar content, were detected during the processes of both domestication and improvement. Furthermore, we found that single mutations in major genes affecting fruit taste, including ma1, MdTDT, and MdSOT2, dramatically decrease malate, citrate, and sorbitol accumulation, respectively, and correspond to important domestication events. Interestingly, ma1 was identified to have pleiotropic effects on both organic acid content and sugar:acid ratio, suggesting that it plays a vital role in determining fruit taste. Fruit taste is unlikely to have been negatively affected by linkage drag associated with selection for larger fruit that resulted from the pyramiding of multiple genes with minor effects on fruit size. Collectively, our study provides new insights into the genetic basis of fruit quality and its evolutionary roadmap during apple domestication, pinpointing several candidate genes for genetic manipulation of fruit taste in apple.

关键词： apple fruit taste organic acids soluble sugars fruit size domestication

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