中国农业科学 ›› 2022, Vol. 55 ›› Issue (21): 4265-4278.doi: 10.3864/j.issn.0578-1752.2022.21.013

• 园艺 • 上一篇    下一篇

‘黑比诺’葡萄不同叶龄叶片叶绿体内淀粉积累及其相关基因表达差异分析

尤佳玲(),李有梅,孙孟豪,谢兆森()   

  1. 扬州大学园艺与植物保护学院,江苏扬州 225009
  • 收稿日期:2022-02-21 接受日期:2022-04-20 出版日期:2022-11-01 发布日期:2022-11-09
  • 通讯作者: 谢兆森
  • 作者简介:尤佳玲,E-mail:youjialing1948@163.com
  • 基金资助:
    国家自然科学基金(31872050);国家自然科学基金青年基金(32102348)

Analysis Reveals the Differential Expression of Genes Related to Starch Accumulation in Chloroplast of Leaf with Different Ages in Pinot Noir Grape

YOU JiaLing(),LI YouMei,SUN MengHao,XIE ZhaoSen()   

  1. College of Horticulture and Plant Protection, Yangzhou University, Yangzhou 225009, Jiangsu
  • Received:2022-02-21 Accepted:2022-04-20 Online:2022-11-01 Published:2022-11-09
  • Contact: ZhaoSen XIE

摘要:

【目的】随着叶龄的增长,葡萄叶片叶绿体内淀粉积累增加,但是调控其淀粉积累的分子机理还未见报道,本研究通过筛选参与调控淀粉积累的潜在基因,阐明葡萄不同叶龄叶片叶绿体中淀粉积累的分子机理。【方法】以2年生‘黑比诺’(Pinot Noir)葡萄为试材,观察不同叶龄叶片叶绿体内淀粉积累动态,并采用高通量测序技术进行转录组分析,筛选出与淀粉和蔗糖代谢途径相关的关键酶基因,同时采用实时荧光定量PCR技术对关键基因进行表达验证。【结果】未展开叶(NL)叶绿体内淀粉粒体积较小,积累量少,随着叶龄增长,在生长中叶(GL)和成熟叶(ML)叶绿体内,淀粉粒体积明显增大,积累量增加。转录组测序共得到58.57 GB的有效数据,KEGG富集分析表明,与NL相比,在GL和ML中差异表达的基因显著富集于淀粉与蔗糖代谢通路。分析该通路基因表达模式发现,细胞壁转化酶(cell wall invertase,CWINV)、磷酸葡萄糖变位酶(Phosphoglucomutase,PGM)、腺苷二磷酸葡萄糖焦磷酸化酶(ADP-glucose pyrophosphorylase,AGPase)等基因参与蔗糖转化为淀粉合成前体腺苷二磷酸葡萄糖(adenosine diphosphate glucose,ADPG)的过程,且随叶龄增大逐渐上调表达;可溶性淀粉合成酶(soluble starch synthase,SSⅠ)、淀粉分支酶(starch branching enzyme,SBE)、α-淀粉酶(α-amylase,AMY)、β-淀粉酶(β-amylase,BAM)等基因参与淀粉合成与水解过程,同样随叶龄增大上调表达,其中AGPaseSSⅠ、SBE在半结晶结构支链淀粉合成中起重要作用。【结论】随着叶龄的增大,叶绿体中淀粉积累增加;AGPase、SSⅠ、SBE等基因可能是参与调控叶绿体内淀粉积累的关键基因。

关键词: 黑比诺, 转录组, 叶龄, 淀粉, 淀粉代谢

Abstract:

【Objective】The accumulation of starch in chloroplast of grape leaves increased with leaf maturation, but the related molecular mechanism has not been reported. In this study, the potential related genes were screened in order to clarify the molecular regulation mechanism of starch accumulation in chloroplast of grape leaves with different leaf ages.【Method】 Two years old ‘Pinot Noir’ grapes (Vitis vinifera L.) were used as plant materials to investigate the dynamic changes of starch accumulation in chloroplast of leaves with different ages. The RNA sequencing technology was used to characterize the differently expressed genes (DEGs) involved in starch and sucrose metabolism in leaves with different ages. The expression levels of several key candidate genes were detected by using real-time quantitative qPCR.【Result】The starch grains in NL (undeveloped leaves) were smallest in volume and lowest in number compared with these in GL (growing leaves) and ML (mature leaves). With the increase of leaf ages, the volume and amount of starch grains in GL and ML also increased. A total of 58.57 GB valid data was obtained by RNA-sequencing. Differentially expressed genes mainly involved in starch and sucrose metabolism pathway for the leaves with different ages. The genes involved in the process of sucrose conversion into starch synthesis precursor adenosine diphosphate glucose (ADP) showed up-regulated expression level with the increase of leaf ages, including cell wall invertase (CWINV), phosphoglucomutase (PGM), and ADP-glucose pyrophosphorylase (AGPase). The genes involved in starch synthesis and hydrolysis also presented up-regulated expression level with the increase of leaf ages, including soluble starch synthase (SSⅠ), starch branching enzyme (SBE), α-amylase (AMY), and β-amylase (BAM). AGPase, SSⅠ and SBE played an important role in synthesis of amylopectin with semi-crystalline structure.【Conclusion】With the increase of leaf ages, the starch accumulation in chloroplast also increased. AGPase, SSⅠ and SBE genes could be the key genes involved in the regulation of starch accumulation in chloroplast of grape leaves.

Key words: Pinot Noir, transcriptome, leaf age, starch, starch metabolism