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作物学报 ›› 2026, Vol. 52 ›› Issue (10): 2971-2983.doi: 10.3724/SP.J.1006.2026.64037

• 作物遗传育种·种质资源·分子遗传学 • 上一篇    下一篇

PaZFP36过表达提高狼尾草的光合效率及生物量积累

郑美1(), 李萍1,2(), 李翠1(), 侯新村1, 赵春桥1, 赵雪铮1, 张乃文1, 范希峰1,*(), 郭强1,*()   

  1. 1 北京市农林科学院草业花卉与生态景观研究所, 北京 100097
    2 甘肃农业大学草业学院 / 草业生态系统教育部重点实验室 / 甘肃省草业工程实验室 / 中-美草地畜牧业可持续发展研究中心, 甘肃兰州 730070
  • 收稿日期:2026-03-24 接受日期:2026-07-15 出版日期:2026-10-12 网络出版日期:2026-07-22
  • 通讯作者: 范希峰, E-mail: fanxifeng@baafs.net.cn;郭强, E-mail: guoqiang@baafs.net.cn
  • 作者简介:郑美, E-mail: zhengmei@baafs.net.cn;
    李萍, E-mail: liping@baafs.net.cn;
    李翠, E-mail: licui@baafs.net.cn** 同等贡献

Overexpression of PaZFP36 enhances photosynthetic efficiency and biomass accumulation in Pennisetum alopecuroides

Zheng Mei1(), Li Ping1,2(), Li Cui1(), Hou Xin-Cun1, Zhao Chun-Qiao1, Zhao Xue-Zheng1, Zhang Nai-Wen1, Fan Xi-Feng1,*(), Guo Qiang1,*()   

  1. 1 Institute of Grassland, Flowers and Ecology, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China
    2 College of Pratacultural Science, Gansu Agricultural University / Key Laboratory of Grassland Ecosystem, Ministry of Education / Pratacultural Engineering Laboratory of Gansu Province / Sino-US Centers for Grazing Land Ecosystem Sustainability, Lanzhou 730070, Gansu, China
  • Received:2026-03-24 Accepted:2026-07-15 Published:2026-10-12 Published online:2026-07-22
  • Contact: Fan Xi-Feng, E-mail: fanxifeng@baafs.net.cn;Guo Qiang, E-mail: guoqiang@baafs.net.cn
  • About author:** Contributed equally to this work

摘要:

C2H2型锌指蛋白在植物生长发育和逆境响应中发挥重要调控作用。本研究基于前期冷胁迫转录组数据, 从‘丽秋’狼尾草(Pennisetum alopecuroides cv. ‘Liqiu’)中克隆获得C2H2型锌指蛋白编码基因PaZFP36, 对其进行生物信息学分析, 并构建PaZFP36过表达载体, 获得转基因拟南芥(Arabidopsis thaliana)和‘丽秋’狼尾草, 通过盆栽试验对转基因株系的光合特性及成熟期农艺性状进行观察和系统分析。结果表明, PaZFP36蛋白分子量为24.65 kD, 等电点为8.49, 含有2个典型的C2H2锌指结构域。在拟南芥和‘丽秋’狼尾草中过表达PaZFP36均显著提高了净光合速率(Pn)、最大光化学效率(Fv/Fm)和光合性能指数(PIabs), 而胞间CO2浓度(Ci)显著降低, 表明PaZFP36通过提升叶肉细胞CO2固定能力、优化PSII反应中心性能和电子传递链效率, 协同增强光合效率。与野生型相比, 拟南芥及‘丽秋’狼尾草过表达PaZFP36株系的株高、鲜重、干重、主根长均显著增加; 转基因拟南芥的荚果长、主茎荚果数及转基因‘丽秋’狼尾草的分蘖数也显著提高。相关性分析显示, 净光合速率与干重呈显著正相关。因此, 过表达PaZFP36可以提高‘丽秋’狼尾草光合效率, 并促进生物量积累和产量形成, 为培育抗逆和高产的狼尾草新品种提供了种质资源及理论依据。

关键词: 狼尾草, PaZFP36, 光合特性, 叶绿素含量, 产量

Abstract:

C2H2-type zinc finger proteins play crucial regulatory roles in plant growth, development, and stress responses. Based on previous transcriptome data under cold stress, a C2H2-type zinc finger protein gene, PaZFP36, was cloned from Pennisetum alopecuroides cv. ‘Liqiu’ in this study. Bioinformatic analysis was performed, and overexpression vectors were constructed and transformed into Arabidopsis thaliana and P. alopecuroides cv. ‘Liqiu’. Photosynthetic characteristics and agronomic traits at maturity were systematically analyzed through pot experiments. The results showed that the PaZFP36 protein has a molecular weight of 24.65 kD and an isoelectric point of 8.49 and contains two typical C2H2 zinc finger domains. Overexpression of PaZFP36 in both Arabidopsis and P. alopecuroides cv. ‘Liqiu’ significantly increased the net photosynthetic rate (Pn), maximum photochemical efficiency (Fv/Fm), and photosynthetic performance index (PIabs), while significantly decreasing the intercellular CO2 concentration (Ci). These results indicate that PaZFP36 synergistically enhances photosynthetic efficiency by improving mesophyll CO2 fixation capacity, optimizing PSII reaction center performance, and enhancing electron transport chain efficiency. Compared with wild-type plants, PaZFP36-overexpressing lines of both Arabidopsis and P. alopecuroides cv. ‘Liqiu’ exhibited significantly increased plant height, fresh weight, dry weight, and main root length. In addition, transgenic Arabidopsis showed significant increases in pod length and pod number per main stem, whereas transgenic P. alopecuroides cv. ‘Liqiu’ showed a significant increase in tiller number. Correlation analysis revealed a significant positive relationship between net photosynthetic rate and dry weight. In conclusion, overexpression of PaZFP36 enhances photosynthetic efficiency and promotes biomass accumulation and yield formation in P. alopecuroides cv. ‘Liqiu’, providing germplasm resources and a theoretical basis for breeding stress-tolerant and high-yielding Pennisetum varieties.

Key words: Pennisetum alopecuroides, PaZFP36, photosynthetic characteristics, chlorophyll content, yield

表1

本研究所用的引物"

引物名称
Primer name
引物序列
Primer sequence (5′-3′)
PaZFP36-F ATGGTCGCCAGCTTCGAAGC
PaZFP36-R ATCCGACATCCTGCGCTTCT
qRT-PaZFP36-F GGTGTCGGTCTCCCTGTC
qRT-PaZFP36-R CTCTGCACCTCTTCCTCCTC
qRT-At-actin-F AGTCCACCCTTCATCTTGTTCTC
qRT-At-actin-R GTCAGCCAAAGTTCTTCCATCT
qRT-Pa-actin-F CTGAGCGGGAAATTGTGAGG
qRT-Pa-actin-R CATGGATGGCTGGAAGAGGA
pBI121-GUS-PaZFP36-F CGGGGGACTCTAGAGGATCCATGGTCGCCAGCTTCGAAG
pBI121-GUS-PaZFP36-R GACTGACCACCCGGGGATCCATCCGACATCCTGCGCTTC
PaZFP36-OE-F ATGTTACGTCCTGTAGAAAC
PaZFP36-OE-R GGATTCACCACTTGCAAAGT

图1

‘丽秋’狼尾草PaZFP36的遗传转化 A: 愈伤组织的培养; B: 愈伤组织培养后进行侵染; C: 抗性愈伤组织的诱导筛选; D: 抗性丛生芽分化; E-F: 抗性苗生根。"

图2

PaZFP36基因结构及其蛋白质理化性质 A: 狼尾草PaZFP36基因的克隆; B: PaZFP36基因结构示意图; C: 蛋白质二级结构; D: 蛋白质亲疏水性预测结果; E: 蛋白质三级结构。"

图3

不同物种的ZFP36蛋白进化树及蛋白多序列比对 A: 进化树分析; B: 不同物种ZFP36蛋白的多序列比对。Pa: 狼尾草; Zm: 玉米; Mf: 五节芒; Pv: 柳枝稷; Ob: 短药野生稻; Os: 水稻; At: 拟南芥。"

图4

PaZFP36过表达拟南芥的分子鉴定、生长表型及光合特性 A: 野生型(WT)与过表达PaZFP36转基因株系(OE-10、OE-11、OE-22、OE-23、OE-40、OE-61)中PaZFP36基因的相对表达量; B: 组织化学GUS染色; C: 4周龄(a)、5周龄(b)的表型图及叶片大小(c), 比例尺= 1 cm; D: 株高; E: 鲜重; F: 干重; G: 主根长; H: 荚果长; I: 主茎荚果数; J: 净光合速率; K: 气孔导度; L: 胞间CO2浓度; M: 叶绿素含量; N: 最大光化学效率(Fv/Fm); O: 光合性能指数(PIabs)。WT: 野生型拟南芥; OE-10和OE-61为过表达PaZFP36的转基因株系; 比例尺= 1 cm。所有数据以平均值±标准差表示, **和*分别表示与野生型相比在0.01和0.05水平差异显著。"

图5

PaZFP36过表达‘丽秋’狼尾草的分子鉴定、生长表型及光合特性 A: T0代阳性转化苗PCR鉴定; B: 野生型(WT)与各过表达转基因株系(OE-1、OE-5、OE-6、OE-7、OE-8、OE-9、OE-10)中PaZFP36基因的相对表达量; C: 野生型(WT)、PaZFP36-OE-8和PaZFP36-OE-9植株整体表型, 比例尺= 2 cm; D: 株高; E: 鲜重; F: 干重; G: 叶宽; H: 分蘖数; I: 主根长; J: 净光合速率; K: 气孔导度; L: 胞间CO2浓度; M: 叶绿素含量; N: 最大光化学效率; O: 光合性能指数。WT: 野生型‘丽秋’狼尾草; OE-8和OE-9为过表达PaZFP36的转基因株系。所有数据以平均值±标准差表示。**和*分别表示与野生型相比在0.01和0.05水平差异显著。"

图6

PaZFP36过表达拟南芥(A)和‘丽秋’狼尾草(B)的光合与生长指标间的相关性分析 Pn: 净光合速率; Gs: 气孔导度; Ci: 胞间CO2浓度; Chla+b: 叶绿素含量; Fv/Fm: 最大光化学效率; PIabs: 光合性能指数; PH: 株高; FW: 鲜重; DW: 干重; MRL: 主根长; PL: 荚果长; NPMS: 主茎荚果数; LW: 叶宽; TN: 分蘖数。红色代表正相关, 青绿色代表负相关, 颜色越深代表相关程度越大。*和**分别表示在0.05和0.01概率水平相关性显著。"

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