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草业学报 ›› 2023, Vol. 32 ›› Issue (4): 91-100.DOI: 10.11686/cyxb2022173

• 研究论文 • 上一篇    下一篇

SbER10_X1调控饲用高粱光合作用和生物产量的功能特性分析

郑甲成1(), 余婕1(), 李凡1, 黄小奕1, 李杰勤1, 陈海州3, 王歆1, 詹秋文1(), 徐兆师2()   

  1. 1.安徽科技学院,安徽 凤阳 233100
    2.中国农业科学院作物科学研究所,国家农作物基因资源与基因改良重大科学工程,农业农村部麦类生物学与遗传育种重点实验室,北京 100081
    3.安徽友鑫农业科技有限公司,安徽 合肥 230000
  • 收稿日期:2022-04-19 修回日期:2022-07-27 出版日期:2023-04-20 发布日期:2023-01-29
  • 通讯作者: 詹秋文,徐兆师
  • 作者简介:E-mail: xuzhaoshi@caas.cn
    E-mail: qwzhan@163.com
    郑甲成(1984-),男,甘肃庆阳人,副教授,博士。E-mail: zhengjiachengx2016@126.com
    余婕(1998-),女,安徽广德人,在读硕士。E-mail: yujiezero@qq.com第一联系人:郑甲成和余婕是共同第一作者
  • 基金资助:
    安徽科技学院校级研究生科研项目(YK202103);国家级大学生创新创业训练计划项目(202210879054);转基因生物新品种培育重大专项(2016ZX08002-002)

Functional characterization of the role of SbER10_X1 in regulating photosynthesis and biomass of sorghum forage

Jia-cheng ZHENG1(), Jie YU1(), Fan LI1, Xiao-yi HUANG1, Jie-qin LI1, Hai-zhou CHEN3, Xin WANG1, Qiu-wen ZHAN1(), Zhao-shi XU2()   

  1. 1.Anhui Science and Technology University,Fengyang 233100,China
    2.Institute of Crop Science,Chinese Academy of Agricultural Sciences,National Key Facility for Crop Gene Resources and Genetic Improvement,Key Laboratory of Biology and Genetic Improvement of Triticeae Crops,Ministry of Agriculture,Beijing 100081,China
    3.Anhui Youxin Agricultural Science and Technology Co. LTD,Hefei 230000,China
  • Received:2022-04-19 Revised:2022-07-27 Online:2023-04-20 Published:2023-01-29
  • Contact: Qiu-wen ZHAN,Zhao-shi XU

摘要:

为了分析SbER10_X1调控高粱光合作用和生物产量的功能特性,本研究以高粱SbER10_X1基因过表达株系(SbERex)、目的基因沉默株系(SbERin)和野生型对照株系(WT)为材料,鉴定转基因株系的阳性和目的基因表达水平,挑选SbERex 5和SbERin 6株系,切片观察茎秆细胞大小,测定主茎秆内植物激素含量,分析光合作用相关参数,并连续两年调查生物量相关指标。结果表明:与WT株系相比,SbERex 5茎秆中赤霉素含量显著增加,脱落酸含量显著降低,导致过表达株系茎秆细胞显著增大,株高显著增加,而SbERin 6株系的赤霉素含量显著减少,脱落酸含量显著升高,但主茎秆细胞大小变化不显著。SbERex 5株系的光合速率和水分利用效率显著增加,引起SbERex 5的株高、分蘖数、叶面积、单株产量和单株生物量显著高于WT,而SbERin 6仅存在减小趋势。结果表明SbER10_X1可以影响植物激素合成,导致高粱细胞体积增大,光合能力增强,有效提升饲用高粱生物产量。

关键词: 高粱, SbER10_X1基因, 光合作用, 生物量, 植物激素

Abstract:

The objective of this study was to functionally analyze SbER10_X1 in terms of its role in regulating the photosynthesis and biomass of sorghum. We generated SbERex lines overexpressing the sorghum SbER10_X1 gene and SbERin lines with the target gene silenced. From the transgenic lines, we selected SbERex 5 and SbERin 6 line for observations of stem cell size, determination of phytohormone contents in the main stems, analyses of photosynthesis-related parameters, and measurement of biomass-related traits in 2 consecutive years, and compared these attributes with those of the wild type (WT). Compared with the WT, SbERex 5 showed a higher gibberellin content in the stem and markedly decreased abscisic acid content, leading to a significant enlargement of stem cells and increased plant height. The SbERin 6 line showed a significantly reduced gibberellin content and increased abscisic acid content in the stem, but the stem cell size was unchanged. Compared with the WT, the SbERex 5 line showed significantly increased photosynthetic rate and water-use efficiency, which contributed to significant increases in plant height, number of tillers, leaf area, grain yield, and biomass per plant. All these characteristics showed slightly lower values in SbERin 6 than in WT. These results suggest that SbER10_X1 affects phytohormone synthesis, increases sorghum cell size, enhances photosynthetic capacity, and effectively improves the biomass production of forage sorghum.

Key words: sorghum, SbER10_X1 gene, photosynthesis, biomass, phytohormones