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Comparison of cell wall changes of two different types of apple cultivars during fruit development and ripening

Journal of Integrative Agriculture 2023年第9期22卷 2705-2718页

作者： LI Xiang-lu SU Qiu-fang JIA Rong-jian WANG Zi-dun FU Jiang-hong GUO Jian-hua YANG Hui-juan ZHAO Zheng-yang College of Horticulture Northwest A&F UniversityYangling 712100P.R.China Apple Engineering and Technology Research Center of Shaanxi Province Yangling 712100P.R.China

fruit development and ripening is a complex procedure(Malus×domestica Borkh.)and can be caused by various factors such as cell structure,cell wall components,and cell wall hydrolytic *** our study,we focused on the variations in fruit firmness,cell wall morphology and components,the activity of cell wall hydrolytic enzymes and the expression patterns of associated genes during fruit development in two different types of apple cultivars,the hard-crisp cultivar and the loose-crisp *** this paper,the aim was to find out the causes of the texture variations between the different type *** wall materials(CWMs),hemicellulose and cellulose content were strongly associated with variations in fruit firmness during the fruit *** content of water soluble pectin(WSP)and chelator soluble pectin(CSP)gradually increased,while the content of ionic soluble pectin(ISP)showed inconsistent trends in the four *** activities of polygalacturonase(PG),β-galactosidase(β-gal),cellulase(CEL),and pectate lyase(PL)gradually increased in four *** the activities of PG,β-gal,and CEL were higher in‘Fuji’and‘Honeycrisp’fruit with the fruit development,while the activity of PL of‘Fuji’and‘Honeycrisp’was lower than that of‘ENVY’and‘Modi’.Both four cultivars of fruit cells progressively became bigger as the fruit expanded,with looser cell arrangements and larger cell *** to the qRT-PCR,the relative expression levels of MdACO and Mdβ-gal were notably *** study showed that there were large differences in the content of ISP and hemicellulose,the activity of PL and the relative expression of Mdβ-gal between two different types of apple cultivars,and these differences might be responsible for the variations in the texture of the four cultivars.

关键词： apple(Malus×domestica Borkh.) fruit softening cell wall firmness

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Effects of Nitric Oxide on the Quality and Pectin Metabolism of Yali Pears During Cold Storage

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Agricultural Sciences in China 2011年第7期10卷 1125-1133页

作者： LIU Li-qin DONG Yu GUAN Jun-feng College of Life Science Hebei Normal University Shijiazhuang 050016 P.R.China Institute of Genetics and Physiology Hebei Academy of Agricultural and Forestry Sciences Shijiazhuang 050051 P.R.China

The effect of fumigation with 10, 20, and 30 μL L-1 nitric oxide （NO） was investigated to study the effects of NO on the quality of Yali pears during cold storage. The ethylene production, composition of cell walls, and cell-wall-modifying enzyme activities were measured on fruits which were fumigated with NO （20 μL L-1）. The results showed that NO not only reduced the peak value of ethylene production rate, the soluble sugar, soluble solid content, maintained higher firmness, starch, and NO content, but also retarded the degradation of covalent soluble pectin, accumulation of ionic soluble pectin and water soluble pectin. Moreover, NO fumigation decreased the activities of polygalacturonase （PG） and b-galactosidase（b-Gal） and delayed the peak of PG activity of fruits. Therefore, it indicated that NO fumigation could delay the softening and ripening of Yali pears.

关键词： pear nitric oxide cell wall material fruit softening

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Apear PGIP gene preferentially expressed during fruit development and regulated by salicylic acid

Apear PGIP gene preferentially expressed during fruit develo...

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从植物科学到农业发展——2012全国植物生物学大会

作者： Haiyan Shi~(*1),Yuxing Zhang~(*1) and Liang Chen~2 1、College of Horticulture,Agricultural University of Hebei,Baoding 071001,China 2、Wuhan Botanical Garden,Chinese Academy of Sciences,Wuhan 430074,China

To elucidate the roles of genes during fruit ripening and softening,a fruit-predominant cDNA(designated PpPGIP1) encoding a polygalacturonase inhibitor protein(PGIP) was isolated from a pear(Pyrus pyrifolia ***) fruit cDNA *** PpPGIPl gene shares high sequence homology at the nucleotide level in the coding region and at the amino acid level with other plant PGIP ***,the corresponding PpPGIPl gene was isolated from pear genomic *** PCR analyses revealed that PpPGIPl transcripts were preferentially accumulated during the developing fruit of *** PpPGIPl expression was gradually up-regulated during fruit development,and its transcripts were accumulated at highest level in 150 d after full bloom *** addition, PpPGIPl gene was dramatically up-regulated in fruit by 0.02 mM salicylic acid for 12 h. These results suggested that the PpPGIPl might be involved in regulation of fruit softening and in response to salicylic acid in pear.

关键词： pear(Pyrus pyrifolia) polygalacturonase inhibitor-like protein fruit softening gene expression salicylic acid.

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