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Disassembly of the fruit cell wall by the ripening-associated polygalacturonase and expansin influences tomato cracking

文献类型： 外文期刊

作者： Jiang, Fangling 1 ; Lopez, Alfonso 2 ; Jeon, Shinjae 2 ; de Freitas, Sergio Tonetto 2 ; Yu, Qinghui 2 ; Wu, Zhen 1 ; L 1 ;

作者机构： 1.Nanjing Agr Univ, Dept Hort, Nanjing 210095, Jiangsu, Peoples R China

2.Univ Calif Davis, Dept Plant Sci, Davis, CA 95616 USA

3.Gangwon Agr Res & Extens Serv, Chunchon 200150, South Korea

4.Xinjiang Acad Agr Sci, Inst Vegetables, Urumqi 830091, Peoples R China

5.Zhejiang Univ, Coll Environm & Resource Sci, Hangzhou 310058, Zhejiang, Peoples R China

期刊名称：HORTICULTURE RESEARCH （ 影响因子：6.793； 五年影响因子：6.589 ）

ISSN： 2052-7276

年卷期： 2019 年 6 卷

页码：

收录情况： SCI

摘要： Fruit cracking is an important problem in horticultural crop production. Polygalacturonase (SlPG) and expansin (SlEXP1) proteins cooperatively disassemble the polysaccharide network of tomato fruit cell walls during ripening and thereby, enable softening. A Golden 2-like (GLK2) transcription factor, SlGLK2 regulates unripe fruit chloroplast development and results in elevated soluble solids and carotenoids in ripe fruit. To determine whether SlPG, SlEXP1, or SlGLK2 influence the rate of tomato fruit cracking, the incidence of fruit epidermal cracking was compared between wild-type, Ailsa Craig (WT) and fruit with suppressed SlPG and SlEXP1 expression (pg/exp) or expressing a truncated nonfunctional Slglk2 (glk2). Treating plants with exogenous ABA increases xylemic flow into fruit. Our results showed that ABA treatment of tomato plants greatly increased cracking of fruit from WT and glk2 mutant, but not from pg/exp genotypes. The pg/exp fruit were firmer, had higher total soluble solids, denser cell walls and thicker cuticles than fruit of the other genotypes. Fruit from the ABA treated pg/exp fruit had cell walls with less water-soluble and more ionically and covalently-bound pectins than fruit from the other lines, demonstrating that ripening-related disassembly of the fruit cell wall, but not elimination of SlGLK2, influences cracking. Cracking incidence was significantly correlated with cell wall and wax thickness, and the content of cell wall protopectin and cellulose, but not with Ca2+ content.

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