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园艺学报 ›› 2021, Vol. 48 ›› Issue (3): 487-504.doi: 10.16420/j.issn.0513-353x.2020-0438

• 研究论文 • 上一篇    下一篇

核桃内果皮硬化期生长素动态变化及差异表达基因分析

鱼尚奇1,2,4, 张锐2,3,4,*(), 郭众仲1,2, 宋岩2,3, 付嘉智2,3, 武鹏雨2,3, 马治浩3   

  1. 1塔里木大学生命科学学院,新疆阿拉尔 843300
    2新疆生产建设兵团塔里木盆地生物资源保护利用重点实验室,新疆阿拉尔 843300
    3塔里木大学植物科学学院,新疆阿拉尔 843300
    4南疆特色果树高效优质栽培与深加工技术国家地方联合工程实验室,新疆阿拉尔 843300
  • 收稿日期:2020-11-16 出版日期:2021-03-25 发布日期:2021-04-02
  • 通讯作者: 张锐 E-mail:zhrgsh@163.com
  • 基金资助:
    新疆生产兵团南疆重点产业创新发展支撑计划项目(2017DB006);国家自然科学基金项目(31260469);研究生科研创新项目(TDGRI201716);大学生创新创业训练计划项目(201910757017)

Dynamic Changes of Auxin and Analysis of Differentially Expressed Genes in Walnut Endocarp During Hardening

YU Shangqi1,2,4, ZHANG Rui2,3,4,*(), GUO Zhongzhong1,2, SONG Yan2,3, FU Jiazhi2,3, WU Pengyu2,3, MA Zhihao3   

  1. 1College of Life Science,Tarim University,Alar,Xinjiang 843300,China
    2Production and Construction Corps Key Laboratory of Protection and Utilization of Biological Resources in Tarim Basin,Alar,Xinjiang 843300,China
    3College of Plant Science and Technology,Tarim University,Alar,Xinjiang 843300,China
    4The National and Local Joint Engineering Laboratory of High Efficiency and Superior-Quality Cultivation and Fruit Deep Processing Technology of Characteristic Fruit Trees in South Xinjiang,Alar,Xinjiang 843300,China
  • Received:2020-11-16 Online:2021-03-25 Published:2021-04-02
  • Contact: ZHANG Rui E-mail:zhrgsh@163.com

摘要:

为研究核桃内果皮硬化主要涉及的生物过程及生长素在硬化过程中的作用,以‘新露’核桃为研究试材,形态学观察及木质素沉积分析表明,内果皮硬化与其表面维管束分布具有密切关系,靠近维管组织附近的内果皮硬化先于远离维管的区域。IAA含量在内果皮硬化过程中呈V字形变化;IAA在5个时期平均含量最高(16.467 ng·g-1),约为IBA、ICA和ME-IAA总和的6.8倍。木质素合成中间代谢物分析显示,木质素单体对香豆醇在内果皮硬化区的含量是未硬化区的16倍,芥子醇在内果皮硬化区的含量极高,但在未硬化区未检测到存在,且随着硬化进程这两种物质在内果皮硬化区的含量总体呈上升趋势。转录组与蛋白组关联分析获得了内果皮硬化相关的差异表达基因369条,在转录水平和蛋白质水平同时存在差异的基因关联结果较好,相关系数最低为0.48124;但差异表达基因整体关联结果较差,相关系数最高为0.22112。利用Metascape构建了差异表达基因显著富集的前20个生物学功能之间的关系网络,发现内果皮硬化主要涉及苯丙烷类代谢、氧胁迫响应、细胞壁组织与生物合成和氨基糖与核酸糖代谢4个生物过程。荧光定量结果表明,AUX/IAA基因JrIAA9JrIAA16JrIAA27的表达量变化趋势与IAA含量的基本一致。由此推测生长素IAA在内果皮硬化过程中发挥着重要调控作用,这对后续开展露仁发生机理研究具有重要参考意义。

关键词: 核桃, 生长素, 内果皮, 转录组, 蛋白组, 关联分析, 木质素

Abstract:

In order to study the hardening of the walnut endocarp,which mainly involves the biological process and the role of auxin in the hardening process,the‘Xinlu’walnut was used as the research material. There is a close relationship between walnut endocarp hardening and distribution of vascular bundles on the walnut endocarp surface by morphological observation and lignin deposition analysis;The hardening of walnut endocarp near the vascular tissue is earlier than that away from the vascular tissue. The content of IAA showed a V-shaped change in the hardening of the endocarp. The average content of IAA was the highest than others during the five stages,16.467 ng·g-1,which was about 6.8 times of the sum of IBA,ICA and ME-IAA. The analysis of intermediate metabolites of lignin synthesis showed that the content of p-coumaryl alcohol of lignin monomer in the hardening area of the endocarp was 16 times of the unhardening area. The content of sinapyl alcohol in the hardening area of the walnut endocarp was extremely high,but it was not detected in the unhardening area,and the content of these two substances in the hardening area of the walnut endocarp showed an overall upward trend with the hardening process. Through transcriptome and proteome correlation analysis,369 differentially expressed genes related to endocarp hardening were obtained. The correlation result of genes that are differentially expressed at both the transcription and protein levels is good,with the lowest correlation coefficient of 0.48124,but the correlation result of all differentially expressed genes is poor,with the highest correlation coefficient of 0.22112. Using Metascape to construct a network of relationships among the top 20 biological functions that are significantly enriched by differentially expressed genes,it is found that four biological processes,namely Phenylpropanoid metabolic process,Response to oxidative stress,Cell wall organization or biogenesis,Amino sugar and nucleotide sugar metabolism were mainly involved in endocarp hardening mainly involve. The fluorescence quantitative results showed that the expression changes trend of AUX/IAA genes JrIAA9,JrIAA16 and JrIAA27 were basically consistent with that of IAA content. It is speculated that IAA plays an important regulatory role in the process of walnut endocarp hardening,and it is of great significance to carry out the research on the mechanism of Bared-nut later.

Key words: walnut, auxin, endocarp, transcriptome, proteome, correlation analysis, lignin

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