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园艺学报 ›› 2025, Vol. 52 ›› Issue (3): 545-560.doi: 10.16420/j.issn.0513-353x.2024-0481

• 遗传育种·种质资源·分子生物学 •    下一篇

梨矮生相关基因转录组筛选与功能分析

吝茹雪, 王斐, 张艳杰, 马力, 刘肖烽, 李舒然, 刘亚龙, 王晨, 姜淑苓*(), 欧春青*()   

  1. 中国农业科学院果树研究所,农业农村部园艺作物种质资源利用重点实验室,辽宁兴城 125100
  • 收稿日期:2024-07-09 修回日期:2024-11-25 出版日期:2025-03-25 发布日期:2025-03-25
  • 通讯作者:
    *E-mail:
  • 基金资助:
    现代农业产业技术体系建设专项资助(CARS-28); 国家自然科学基金项目(32072531); 中国农业科学院科技创新工程项目(CAAS-ASTIP-2016-RIP)

Transcriptome Screening and Functional Analysis of Dwarf Related Genes in Pear

LIN Ruxue, WANG Fei, ZHANG Yanjie, MA Li, LIU Xiaofeng, LI Shuran, LIU Yalong, WANG Chen, JIANG Shuling*(), OU Chunqing*()   

  1. Key Laboratory of Biology and Genetic Improvement of Horticultural Crops,Germplasm Resources Utilization,Ministry of Agriculture and Rural Affairs,Research Institute of Pomology,Chinese Academy of Agricultural Sciences,Xingcheng,Liaoning 125100,China
  • Received:2024-07-09 Revised:2024-11-25 Published:2025-03-25 Online:2025-03-25

摘要:

为筛选梨矮生相关基因并分析其功能,以12个株型不同的梨品种(系)为试材,于新梢生长期测定其新梢长度和节间长度;利用转录组测序技术在‘早酥’(普通型)、‘锦香’(半矮生型)和‘中矮1号’(矮生型)梨不同时期生长点、叶片和韧皮部中筛选差异表达基因,并结合在12个品种(系)新梢韧皮部中的表达验证,筛选与矮生性状相关的候选基因,将候选基因PcGA2ox2转化烟草分析其功能。结果表明,‘早酥’‘锦香’和‘中矮1号’的新梢长度在新梢生长初期差异较小,在生长中后期矮生品种短于普通品种;6个普通型品种生长中后期的新梢长度和节间长度均显著长于6个矮生或半矮生型品种(系);‘早酥’‘锦香’和‘中矮1号’不同时期不同组织不同差异分组两两样品间的差异表达基因数量在1 882 ~ 5 729之间,其中,在叶片和韧皮部中的表达量均随枝条长度缩短而升高或降低的差异表达基因有51个;选择在3个品种新梢韧皮部中差异表达的9个基因利用RT-qPCR在12个品种(系)中进行验证,有4个基因表现出在矮生型品种(系)中的表达显著高于或低于普通型品种(系)的趋势,确定为矮生性状相关候选基因;其中1个矮生候选基因为GA2ox家族基因。进一步在‘中矮1号’基因组中鉴定出了15个GA2ox家族成员,分析发现PcGA2ox2在矮生型品种新梢韧皮部中的表达显著高于普通型品种。将PcGA2ox2在烟草中过表达,转化植株较对照明显变小。综上,认为PcGA2ox2在‘中矮1号’的矮生中起重要作用。

关键词: 梨, 矮生, 转录组分析, 赤霉素, PcGA2ox

Abstract:

To screen the dwarf trait related genes,the shoot length and internode length of 12 pear varieties or selections with different plant architectures were measured during the new shoot growth period. The genes differentially expressed in the growth points,leaves and phloem among three pear varieties ‘Zaosu’(vigorous),‘Jinxiang’(semi-dwarf)and‘Zhongai 1’(dwarf)at different periods were screened by transcripome sequencing analysis. Combined with the expression verification in new shoot phloem of 12 varieties or selections,dwarf trait related candidate genes were obtained. One of the candidate genes PcGA2ox2 was overexpressed in tobacco to analyze its function. The results showed that the new shoot length of‘Zaosu’,‘Jinxiang’and‘Zhongai 1’had a slight difference in the early growth period,while showed a significant difference in the middle and late growth period of new shoot. The internode length of dwarf varieties were shorter than that of vigorous varieties in all test periods. The shoot length and internode length of six vigorous varieties were significantly longer than those of six dwarf or semi-dwarf varieties or selections in the middle and late growth period of new shoot. The number of differentially expressed genes between two samples ranged from 1 882 to 5 729 in different tissues,and periods of three varieties. Among them,51 differentially expressed genes showed an increase or decrease in expression levels with the decrease of new shoot length in both leaf and phloem. Nine differentially expressed genes in new shoot phloem of three varieties were selected to verify the expression levels by RT-qPCR in the phloem of 12 pear varieties or selections in the late growth period of new shoot. Among them,four genes showed a tendency of significant higher or lower expression in dwarf varieties or selections than that in vigorous varieties or selections,and were identified as candidate genes related to dwarf trait. One of the dwarf candidate genes was a member of GA2ox family genes. Total 15 members of the GA2ox gene family were further identified in the‘Zhongai 1’genome,and the expression of the candidate PcGA2ox2 gene was significantly higher in new shoot phloem of dwarf varieties or selections than that of vigorous varieties. Then PcGA2ox2 gene was overexpressed in tobacco,the transformed plants were significantly smaller than the control plants. In conclusion,PcGA2ox2 gene plays a key role in the dwarf trait of‘Zhongai 1’pear.

Key words: pear, dwarf, transcriptome analysis, gibberellin, PcGA2ox