文章基本信息

标题：A sweet orange mutant impaired in carotenoid biosynthesis and reduced ABA levels results in altered molecular responses along peel ripening
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作者：Paco Romero ; María Teresa Lafuente ; María Jesús Rodrigo 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2019
卷号：9
期号：1
页码：1-16
DOI：10.1038/s41598-019-46365-8
出版社：Springer Nature
摘要：Citrus fruit ripening is a complex process involving biochemical, physiological and molecular events that differ between the flesh and the peel of the fruit. We characterized sweet orange peel maturation by means of a comparative transcriptomic analysis between Navelate orange (Citrus sinensis L. Osbeck) and its mutant fruit Pinalate, which presents a severe blockage at early steps of the carotenoid biosynthetic pathway and consequently reduced ABA levels. Peel ripening involved the decrease of the photosynthetic activity and the transmembrane transport processes, as well as the buildup of starch and cuticular waxes and the cell wall modification. In addition, a number of biotic and abiotic stress responses, including the defense response, and the response to blue light, water deprivation and abscisic acid stimulus were modulated in a ripening-stage specific manner. The regulation of energy-related processes and secondary metabolism pathways was attenuated in Pinalate, while the molecular mechanisms underlying stress responses displayed dependency on ABA levels. These results indicate that ABA is a key signal inducing stress responses along orange peel ripening, which might determine the fruit postharvest performance.