脱落酸对番茄部分果实性状和营养品质的影响

为研究脱落酸(ABA)对番茄果实品质的影响,本研究测定了番茄ABA生物合成缺失突变体not和flc及其野生型各成熟时期果实,以及外源100μmol·L^-1 ABA处理后不同天数的番茄果实的外观品质和营养品质。结果表明,内源ABA缺失抑制番茄果实增重并促进果实纵向生长,但对果实硬度无明显影响。同时,内源ABA可影响番茄果实可溶性固形物含量并促进破色期和转色期的还原糖积累。not和flc果实中番茄红素、β-胡萝卜素、叶黄素和总类胡萝卜素含量均显著高于其野生型,且外源喷施试验表明,与对照组相比,外源100μmol·L^-1 ABA处理能显著抑制番茄果实中番茄红素、β-胡萝卜素和总类胡萝卜素的积累。综上,ABA在调控番茄果实外观品质方面,可促进番茄果实增重并抑制番茄果实纵向生长;在调控番茄果实营养品质方面,可促进还原糖积累并抑制类胡萝卜素积累。本研究结果为利用ABA调控番茄果实品质提供了一定的理论依据和技术支持。

Effect of Abscisic Acid on Partial Traits and Nutritional Quality in Tomato Fruit

In order to investigate the effects of phytohormone abscisic acid (ABA) on the tomato fruit quality, the visual and nutritional quality of ABA biosynthetic deficiency mutants, not and flc, and their wild types at different ripening stages as well as the fruits at different days after 100 μM ABA treatment were analyzed. The results showed that endogenous ABA deficiency significantly decreased the fruit weight and promoted the fruit longtitudinal elongation, but had no effect on fruit firmness. ABA affected the soluble solids content of tomator fruits and promoted the accumulation of reducing sugar in the color-breaking periods. Moreover, the contents of lycopene, β-carotene, lutein and total carotenoids greatly increased in two ABA deficiency mutants when compared with their wild types. Meanwhile, the contents of lycopene, β-carotene and total carotenoids significantly decreased after exogenous 100 M ABA treatment. Taken together, ABA increased the fruit weight and inhibited the fruit longitudinal elongation in terms of fruit visual regulation. ABA also promoted the reduced sugar accumulation and decreased the carotenoid accumulation in tomato fruits in term of fruit nutritional quality. These findings will provide the theoretical basis and technical support for the improvement of fruit quality via regulation of ABA.