1.中国农业科学院油料作物研究所/农业农村部油料作物生物学与遗传育种重点实验室,湖北 武汉,430062
2.湖北洪山实验室,湖北 武汉,430070
纪翔(2002- ),男,硕士研究生,主要从事油菜耐盐机理研究,E-mail: jsc121381@163.com
华玮(1977- ),女,研究员,博士,从事油料作物分子改良理论研究,E-mail: huawei@oilcrops.cn
收稿:2026-08-07,
纸质出版:2026-10-25
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纪翔,范世航,胡静等.外源N-乙酰-L-半胱氨酸缓解油菜盐胁迫损伤[J].中国油料作物学报,2026,48(05):87-100.
JI Xiang,FAN Shi-hang,HU Jing,et al.Exogenous N-acetyl-L-cysteine alleviates salt-induced damage in Brassica napus L.[J].Chinese Journal of Oil Crop Sciences,2026,48(05):87-100.
纪翔,范世航,胡静等.外源N-乙酰-L-半胱氨酸缓解油菜盐胁迫损伤[J].中国油料作物学报,2026,48(05):87-100. DOI: 10.19802/j.issn.1007-9084.2026269.
JI Xiang,FAN Shi-hang,HU Jing,et al.Exogenous N-acetyl-L-cysteine alleviates salt-induced damage in Brassica napus L.[J].Chinese Journal of Oil Crop Sciences,2026,48(05):87-100. DOI: 10.19802/j.issn.1007-9084.2026269.
N-乙酰-L-半胱氨酸(N-acetylcysteine,NAC)作为含巯基的小分子化合物,可有效清除植物在非生物胁迫下过量积累的活性氧,但其在油菜盐胁迫调控中的作用尚不明确。本研究采用150 mmol/L NaCl模拟盐胁迫,通过设置0、50、100、150和200 μmol/L NAC浓度梯度进行预处理筛选,最终确定100 μmol/L为最适外源处理浓度,并系统分析了外源NAC对油菜幼苗生长表型、生理特性及胁迫响应基因表达的影响。结果表
明,外源100 μmol/L NAC处理缓解了盐胁迫对油菜幼苗生长发育的抑制作用,且外源NAC处理降低了盐胁迫下地上部可溶性糖和脯氨酸的积累,并有效维持了Na
+
/K
+
稳态。同时,降低了地上部和地下部中MDA含量,减轻了膜脂过氧化损伤;并以组织特异性方式参与调控POD、SOD和CAT酶活性,增强活性氧清除能力。qRT-PCR分析显示,盐胁迫下,
BnRD29A
、
BnCAT2
等胁迫响应基因在油菜地上部或地下部中上调,而外源NAC处理可以有效缓解其变化幅度。综上,外源NAC通过调控渗透调节物质积累、维持离子稳态、增强抗氧化防御及胁迫响应基因表达等多重机制,协同缓解盐胁迫对油菜的损伤。
N-acetyl-L-cysteine (NAC)
a sulfhydryl-containing small molecule
effectively scavenges excess reactive oxygen species (ROS) that accumulate in plants under abiotic stress. However
its regulatory role in salt stress responses in rapeseed remains unclear. In this study
salt stress was imposed using 150 mmol/L NaCl
and a gradient of NAC concentrations (0
50
100
150
and 200 μmol/L) was applied in pretreatment screening
leading to the identification of 100 μmol/L as the optimal exogenous concentration. The effects of exogenous NAC on growth phenotypes
physiological traits
and stress-responsive gene expression were systematically evaluated. The results demonstrated that exogenous application of 100 μmol/L NAC significantly alleviated the inhibition of seedling growth under salt stress. NAC treatment reduced the accumulation of salt-induced soluble sugars and proline in shoots and effectively maintained Na
+
/K
+
homeostasis. Moreover
it decreased malondialdehyde content in both shoots and roots
thereby mitigating membrane lipid peroxidation. NAC also modulated the activities of peroxidase
superoxide dismutase
and catalase in a tissue-specific manner
thereby reinforcing ROS scavenging capacity. qRT-PCR analysis revealed that salt stress significantly upregulated stress-responsive genes such as
BnRD29A
and
BnCAT2
in shoots and/or roots
whereas exogenous NAC treatment significantly attenuated these changes. Collectively
these findings indicate that exogenous NAC alleviates salt-induced damage in rapeseed through multiple coordinated mech
anisms
including modulation of osmolyte accumulation
maintenance of ion homeostasis
enhancement of antioxidant defense
and regulation of stress-responsive gene expression.
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