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Transcriptomic and physiological comparison of Shatangju (Citrus reticulata) and its late-maturing mutant provides insights into auxin regulation of citrus fruit maturation

文献类型： 外文期刊

作者： Lv, Yuanda 1 ; Ren, Shuang 1 ; Wu, Bo 1 ; Jiang, Caizhong 2 ; Jiang, Bo 1 ; Zhou, Birong 1 ; Zhong, Guangyan 1 ; Zhong, Yun 1 ; Yan, Huaxue 1 ;

作者机构： 1.Guangdong Acad Agr Sci, Minist Agr & Rural Affairs,Inst Fruit Tree Res, Key Lab South Subtrop Fruit Biol & Genet Resource, GuangdongProv Key Lab Trop & Subtrop Fruit Tree R, 80 Dafeng 2 St, Guangzhou 510650, Guangdong, Peoples R China

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

关键词： Citrus fruit; auxin; carotenoid; maturation; transcriptome

期刊名称：TREE PHYSIOLOGY （ 影响因子：4.0； 五年影响因子：4.7 ）

ISSN： 0829-318X

年卷期： 2023 年 43 卷 10 期

页码：

收录情况： SCI

摘要： Previous studies have shown that abscisic acid (ABA) and ethylene are involved in pulp maturation and peel coloration in the nonclimacteric citrus fruits. There are also signs indicating that other plant hormones may play some roles in citrus fruit ripening. In this study, we compared profiles of genome-wide gene expression and changes in hormones and peel pigments between fruits of Shatangju mandarin (Citrus reticulata Blanco, designated WT) and its natural mutant, Yuenongwanju (designated MT). The MT fruit matures similar to 2 months later than the WT fruit. Significant differences in fruit diameter, total soluble solids, titratable acid content, chlorophylls and carotenoids were detected between the fruits of the two genotypes at the sampled time points. Genome-wide transcriptome profiling showed that many genes involved in auxin and ABA metabolism and/or signaling pathways were differentially expressed between the MT and the WT fruits. Importantly, the expression of CrYUCCA8 was significantly lower and the expression of CrNCED5 was significantly higher in WT than in MT fruits at 230 and 250 DPA, respectively. In addition, the indole-3-acetic acid (IAA) level in the MT fruit was significantly higher than that in the WT counterpart, whereas a significantly lower level of ABA was detected in the mutant. Treatment of the WT fruit with exogenous IAA significantly delayed fruit maturation. Our results provide experimental evidence supporting the notion that auxin is a negative regulator of fruit maturation in citrus.

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