草业学报 ›› 2026, Vol. 35 ›› Issue (10): 144-155.DOI: 10.11686/cyxb2025436
• 研究论文 • 上一篇
王艺华1(
), 任慈1, 张盼玉1, 刘翠玲1, 何亮亮1, 李洁仪1, 刘超1, 陈曙1,2,3(
)
收稿日期:2025-10-21
修回日期:2025-12-05
出版日期:2026-10-20
发布日期:2026-09-09
通讯作者:
陈曙
作者简介:E-mail: shuchen@scau.edu.cn基金资助:
Yi-hua WANG1(
), Ci REN1, Pan-yu ZHANG1, Cui-ling LIU1, Liang-liang HE1, Jie-yi LI1, Chao LIU1, Shu CHEN1,2,3(
)
Received:2025-10-21
Revised:2025-12-05
Online:2026-10-20
Published:2026-09-09
Contact:
Shu CHEN
摘要:
在热带和亚热带地区,柱花草属是极具经济价值的豆科牧草,被誉为“热带苜蓿”,在饲草生产、水土保持、果园覆盖等领域发挥重要作用。随着全球盐碱地面积逐年扩大,盐胁迫导致柱花草生长受阻、产量下降,已成为限制其栽植推广的关键障碍,亟需挖掘耐盐关键基因并解析其功能。NAC转录因子是植物耐盐调控的核心家族,而柱花草SgNAC1的耐盐特性尚未明确。本研究通过实时荧光定量PCR分析SgNAC1基因在细茎柱花草株系‘YN02’叶片及茎中的表达模式。结果表明,盐胁迫(150 mmol·L-1 NaCl)处理后,叶片中SgNAC1基因表达量在2 h时降至最低,茎中表达量在6 h达到峰值;脱落酸(ABA)处理后,叶片和茎中SgNAC1基因表达量均在处理1 h达到最高,在ABA+NaCl复合处理后,叶片中SgNAC1基因表达量在处理0.5 h后达到峰值,茎中表达量在1 h出现第一个峰值,12 h出现第二个峰值。上述结果表明,茎中SgNAC1基因在12 h左右响应盐胁迫,在1 h左右响应ABA和ABA+NaCl胁迫;盐胁迫下叶片中SgNAC1基因表达量在2 h显著下降,推测可能受其他因素调控;ABA+NaCl 复合处理下茎中SgNAC1基因的双表达峰,可能是NaCl与ABA协同作用的结果。通过根癌农杆菌介导的叶盘法转化野生型烟草,成功获得SgNAC1过表达的转基因烟草株系(SgNAC1-OE)。对野生型和SgNAC1-OE烟草同时进行盐胁迫(300 mmol·L-1 NaCl)处理,测定处理前后叶片的各项生理指标发现,SgNAC1过表达显著提升了脯氨酸水平,增强了烟草耐盐能力。本研究明确了SgNAC1基因在柱花草不同组织中的表达特征,并通过转基因烟草验证了其耐盐功能,为柱花草耐盐机制解析及耐盐育种提供理论依据和基因资源。
王艺华, 任慈, 张盼玉, 刘翠玲, 何亮亮, 李洁仪, 刘超, 陈曙. 柱花草SgNAC1基因的耐盐功能研究[J]. 草业学报, 2026, 35(10): 144-155.
Yi-hua WANG, Ci REN, Pan-yu ZHANG, Cui-ling LIU, Liang-liang HE, Jie-yi LI, Chao LIU, Shu CHEN. A functional study of the role of SgNAC1 in salt tolerance in Stylosanthes[J]. Acta Prataculturae Sinica, 2026, 35(10): 144-155.
| 引物名称Name of the primer | 正向引物序列Forward primer sequence (5'→3') | 反向引物序列Reverse primer sequence (5'→3') |
|---|---|---|
| SgNAC1 | TCTAGAATGGCAGCTGAACTTCAATTGC | GGATCCTCAGAACGGTTTCTGCAGGTTC |
| SgNAC1-qPCR | TTCCGATCATAGCCGAAATC | TGCCTTCCAGTACCCAGTTC |
| SgActin-qPCR | TCGATTGGATCTTGCAGGGC | TGGACAACGGAATCTCTCAGC |
表1 本研究所用引物
Table 1 Primers used in this study
| 引物名称Name of the primer | 正向引物序列Forward primer sequence (5'→3') | 反向引物序列Reverse primer sequence (5'→3') |
|---|---|---|
| SgNAC1 | TCTAGAATGGCAGCTGAACTTCAATTGC | GGATCCTCAGAACGGTTTCTGCAGGTTC |
| SgNAC1-qPCR | TTCCGATCATAGCCGAAATC | TGCCTTCCAGTACCCAGTTC |
| SgActin-qPCR | TCGATTGGATCTTGCAGGGC | TGGACAACGGAATCTCTCAGC |
图1 SgNAC1基因启动子顺式作用元件及其基因结构分析A~E分别代表5个保守亚结构域。A-E represent the 5 conserved subdomains.
Fig.1 Analysis of cis-acting elements in the promoter of SgNAC1 gene and its gene structure
图2 不同处理下柱花草‘YN02’叶片及茎中SgNAC1基因的相对表达量变化NaCl:盐胁迫Salt stress;ABA:脱落酸Abscisic acid. A:盐胁迫下叶片中SgNAC1表达量的变化;B:ABA处理下叶片中SgNAC1表达量的变化;C:ABA和NaCl处理下叶片中SgNAC1表达量的变化;D:盐胁迫下茎中SgNAC1表达量的变化;E:ABA处理下茎中SgNAC1表达量的变化;F:ABA和NaCl处理下茎中SgNAC1表达量的变化;* 和 **分别表示在P<0.05和P<0.01水平存在显著差异。A: Changes in SgNAC1 expression levels in leaves under salt stress; B: Changes in SgNAC1 expression levels in leaves treated with ABA; C: Changes in SgNAC1 expression levels in leaves treated with NaCl and ABA; D: Changes in SgNAC1 expression levels in stems under salt stress; E: Changes in SgNAC1 expression levels in stems treated with ABA; F: Changes in SgNAC1 expression levels in stems treated with NaCl and ABA. * and ** indicate significant differences at P<0.05 and P<0.01 levels, respectively.
Fig.2 Changes in the relative expression levels of the SgNAC1 gene in leaves and stems of Stylosanthes ‘YN02’ under different treatments
图3 SgNAC1-OE转基因烟草的Basta抗性鉴定及SgNAC1基因的PCR鉴定和qRT-PCR分析A:转基因植株的草铵膦抗性鉴定,W38为野生型烟草株系。1~18均为转基因SgNAC1-OE同一株系的不同单株,黑色标记为草铵膦涂抹处;B:野生型及转基因烟草中SgNAC1基因的PCR鉴定。C: 野生型及转基因烟草中SgNAC1基因的qRT-PCR分析。2K-MK为DNA marker DL 2000,N1为农杆菌菌液阳性对照,WT为野生型烟草W38, 1~18均为转基因株系;***表示在P<0.001水平存在显著差异。A: Basta resistance identification of transgenic plants, with W38 as the wild type N. tabacum. 1-18 are different individual plants from the same transgenic SgNAC1-OE strain, with black marks indicating Basta application sites; B: PCR identification of the SgNAC1 gene in wild-type and transgenic tobacco. C: qRT-PCR analysis of the SgNAC1 gene in wild-type and transgenic tobaccos. 2K-MK is the DNA marker DL 2000, N1 is the Agrobacterium culture positive control, WT is the wild type N. tabacum W38, and 1-18 are transgenic lines. *** indicates significant differences at the P<0.001 levels.
Fig.3 Identification of Basta resistance in SgNAC1-OE transgenic tobacco, PCR identification and qRT-PCR analysis of the SgNAC1 gene
图4 转基因与野生型烟草叶片长宽比与花色差异*表示与 WT 相比有显著差异(P<0.05), SgNAC1-OE为转基因烟草,WT为野生型烟草W38。下同。标尺=10 cm。* indicates a significant difference compared to WT (P<0.05). SgNAC1-OE refers to transgenic N. tabacum, and WT refers to wild-type tobacco W38. The same below. Bar=10 cm.
Fig.4 Differences in the length-to-width ratio and flower color between genetically modified and wild N. tabacum leaves
图6 盐胁迫下野生型与过表达SgNAC1烟草生理指标变化*表示与处理前相比有显著差异(P<0.05),**表示与处理前相比有极显著差异(P<0.01)。* indicates a significant difference compared to before processing (P<0.05). ** indicates an extremely significant difference compared to before treatment (P<0.01).
Fig.6 Changes in physiological indicators of wild-type and SgNAC1-overexpressing tobacco under salt stress
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