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Comparative transcriptome analysis to identify fruit coloration-related genes of late-ripening litchi mutants and their wild type

文献类型： 外文期刊

作者： Ding, Feng 1 ; Li, Haoran 2 ; Zhang, Shuwei 3 ; Wang, Jinying 1 ; Peng, Hongxiang 3 ; Chen, Houbin 4 ; Hu, Fuchu 5 ; Lai, 1 ;

作者机构： 1.Guangxi Univ, Coll Agr, State Key Lab Conservat & Utilizat Subtrop Agrobi, Nanning 530004, Guangxi, Peoples R China

2.Guangxi Key Lab Genet Improvement Crops Guangxi A, Nanning 530007, Guangxi, Peoples R China

3.Guangxi Acad Agr Sci, Hort Res Inst, Nanning 530007, Guangxi, Peoples R China

4.South China Agr Univ, Hort Coll, Guangzhou 510642, Guangdong, Peoples R China

5.Hainan Acad Agr Sci, Inst Trop Fruit Trees, Hainan Prov Key Lab Trop Fruit Tree Biol, Haikou 510642, Hainan, Peoples R China

6.Yangtze Normal Univ, Sch Adv Agr & Bioengn, Chongqing 408100, Peoples R China

7.Hainan Univ, Coll Hort, Haikou 570228, Hainan, Peoples R China

8.South China Agr Univ, China Litchi Res Ctr, State Key Lab Conservat & Utilizat Subtrop Agrobi, Guangzhou 510642, Peoples R China

关键词： Litchi; Late-ripening mutants; Anthocyanin biosynthesis; Chlorophyll degradation; Hormone signaling; Transcriptome

期刊名称：SCIENTIA HORTICULTURAE （ 影响因子：3.463； 五年影响因子：3.672 ）

ISSN： 0304-4238

年卷期： 2021 年 288 卷

页码：

收录情况： SCI

摘要： Litchi (Litchi chinensis Sonn.) is an important subtropical fruit crop with high economic and nutritional values. Fruit coloration is a sign of litchi fruit ripening and an important external quality traits. Two continuous generations of mutants, named MS1 and MS2, originally derived from cultivar 'Heli', exhibited the distinctive characteristic of late maturation of 20 d, with observable delays in coloration. The present study aimed to understand the mechanism underlying maturation difference between 'Heli' and its two mutants. An RNA-seq analysis revealed 6,145 differentially expressed genes, mostly identified at the color-breaking stage. The maximum expression levels of some genes involved in anthocyanin biosynthesis and chlorophyll degradation were delayed in the pericarp of the mutants compared with in the original cultivar. Generally, they peaked at earlier stages (S2/S3) in 'Heli', compared with later stages (S4/S5) in mutants. Moreover, some hormonal signal receptors, especially those involved in abscisic and ethylene signaling pathways, were also differentially expressed between the original cultivar and the mutant. Transcription factors, including MYB, bHLH, bZIP, and WRKY, correlated with anthocyanin biosynthesis, chlorophyll degradation and abscisic acid signal pathways were identified. The late pigmentation in mutants was related to the fruit ripening program, a complex and comprehensive process. Additionally, we identified novel candidate genes that are involved in the regulation of litchi fruit pigmentation of and gained significant insights into the process of litchi fruit ripening.

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