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Disrupted sugar transport and continued sugar consumption lead to sugar decline in ripe 'Shixia' longan fruit

文献类型： 外文期刊

作者： Huang, Shilian 1 ; Lv, Xinmin 1 ; Han, Yun 4 ; Han, Dongmei 1 ; Wei, Junbin 1 ; Li, Jianguang 1 ; Guo, Dongliang 1 ;

作者机构： 1.Guangdong Acad Agr Sci, Inst Fruit Tree Res, Guangzhou 510640, Peoples R China

2.Minist Agr & Rural Affairs, Key Lab South Subtrop Fruit Biol & Genet Resource, Guangzhou 510640, Peoples R China

3.Guangdong Prov Key Lab Trop & Subtrop Fruit Tree R, Guangzhou 510640, Peoples R China

4.Wenzhou Ecol Environm Bur, Pingyang Branch, Wenzhou 325400, Peoples R China

关键词： Dimocarpus longan; Sugar receding; Metabolome profiling; Transcriptome sequencing; Sucrose transporter

期刊名称：LWT-FOOD SCIENCE AND TECHNOLOGY （ 影响因子：6.0； 五年影响因子：6.0 ）

ISSN： 0023-6438

年卷期： 2024 年 191 卷

页码：

收录情况： SCI

摘要： Longan fruit pulp sugar content and sweetness decline after ripening, which affects fruit quality and postharvest storage. Fruit sugar decline research has focused mainly on fruit physiology and biochemistry. To explore the molecular mechanism underlying sugar decline, we conducted transcriptome and metabolome analyses of 'Shixia' longan fruit aril (pulp) tissues at different stages of development. In total, 873 metabolites and 26584 annotated unigenes were identified. Sugar content changes in aril tissues were closely related to gene expression patterns related to starch and sucrose metabolism, such as sucrose phosphate synthase (SPS), invertase (INV), sucrose synthase (SUS), and glucose-6-phosphate isomerase (GPI). Notably, glycolytic pathway gene expression and cellulose and lignin contents increased during the sugar decline stage compared to the sugar accumulation stage. Conversely, sucrose transporter genes, such as DlSWEET2b, DlSWEET10, and DlSWEET12, showed the opposite expression pattern, pointing to reduced sucrose transport during sugar decline. These results indicate that longan fruit sugar decline is likely related to an interruption of sugar input (cessation of sucrose transport to the aril) and continued glycolysis and cellulose/lignin biosynthesis. This provides a new way to delay longan fruit sugar decline, by regulating sugar transport instead of inhibiting respiration.

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