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植物研究 ›› 2024, Vol. 44 ›› Issue (2): 232-238.doi: 10.7525/j.issn.1673-5102.2024.02.008

• 遗传与育种 • 上一篇    下一篇

一株拟南芥宽叶形突变体atscamp的分离鉴定

郝雪峰1(), 贾晓宇1, 曹海艳1, 亢春霞1, 裴雁曦2   

  1. 1.太原师范学院,生物科学与技术学院,晋中 030619
    2.山西大学,生命科学学院,特色植物资源研究与利用山西省重点实验室,太原 030006
  • 收稿日期:2023-08-07 出版日期:2024-03-20 发布日期:2024-03-11
  • 通讯作者: 郝雪峰 E-mail:Haoxf@tynu.edu.cn
  • 作者简介:郝雪峰(1978—),女,副教授,主要从事非生物胁迫下植物气体信号转导研究。E-mail:Haoxf@tynu.edu.cn
  • 基金资助:
    山西省应用基础研究计划项目(20210302123091);太原师范学院研究生教育创新项目(SYYJSYC-2320)

Isolation and Identification of a Novel Enlarged Leaf Mutant atscamp in Arabidopsis thaliana

Xuefeng HAO1(), Xiaoyu JIA1, Haiyan CAO1, Chunxia KANG1, Yanxi PEI2   

  1. 1.College of Biological Science and Technology,Taiyuan Normal University,Jinzhong 030619
    2.Shanxi Key Laboratory for Research and Development of Regional Plants,School of Life Science,Shanxi University,Taiyuan 030006
  • Received:2023-08-07 Online:2024-03-20 Published:2024-03-11
  • Contact: Xuefeng HAO E-mail:Haoxf@tynu.edu.cn

摘要:

叶片是主要的光合作用器官,选育利于光合作用的叶片形态已成为重要的育种目标。atscamp是从拟南芥(Arabidopsis thaliana)突变体库(约6 000株系)中筛选获得的1株叶片宽大突变体。Tail-PCR分析该突变体为AT1G11180位点的插入,该基因位点编码1个分泌载体膜蛋白(SCAMP)。RT-PCR检测显示,该基因转录表达水平基本为零。进一步研究发现,该突变体叶片的宽度和叶面积极显著大于野生型植株(P<0.01),但是冠幅基本保持不变;同时atscamp突变体叶绿素含量增加,叶绿素最大荧光、PSⅡ潜在光化学效率显著增加(P<0.05);相应地,突变体植株蒸腾系数(Tr)、净光合速率(Pn)和叶片水分利用效率(WUE)显著增加(P<0.05)。拟南芥AT1G11180基因的时空特异性表达分析显示,该基因仅在叶片中高表达,在其他器官中表达量很低;且随着植物发育成熟,该基因表达量逐渐增加。研究结果表明AtSCAMP基因在叶形发育中发挥着重要作用。

关键词: 拟南芥, AtSCAMP基因, 叶形, 突变体

Abstract:

Leaf is the main photosynthetic organ, and the leaf morphology beneficial for photosynthesis has become an important breeding target. atscamp was screened from the Arabidopsis thaliana mutant library(about 6 000 lines) with wide leaves. Tail-PCR analysis revealed a T-DNA insertion at the AT1G11180 locus, which encodes a secretory carrier membrane protein(SCAMP). RT-PCR showed that the transcriptional expression level of the gene was basically zero. The leaf width and area of the mutant were significantly larger than those of wild type plants(P<0.01), while the crown diameter was essentially unchanged. Additionally, chlorophyll content, chlorophyll maximium fluorescence, and photosystem II potential photochemical efficiency were all increased in the atscamp mutant(P<0.05). Correspondingly, the mutants showed significant increases in transpiration coefficient(Tr), net photosynthetic rate(Pn), and leaf water use efficiency(WUE)(P<0.05). Spatial-temporal specific expression analysis of the AT1G11180 gene revealed that the gene was highly expressed only in leaves, with low expression levels in other organs, and the gene expression gradually increased with the development and maturity of plants. The results suggested that AtSCAMP might play an important role in leaf shape development.

Key words: Arabidopsis thaliana, AtSCAMP gene, leaf shape, mutant

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