作物学报 ›› 2025, Vol. 51 ›› Issue (1): 247-259.doi: 10.3724/SP.J.1006.2025.44044
宋倩娜1,2(
), 宋慧洋1, 李京昊1, 段永红1, 梅超1,2, 冯瑞云1,2,*(
)
SONG Qian-Na1,2(
), SONG Hui-Yang1, LI Jing-Hao1, DUAN Yong-Hong1, MEI Chao1,2, FENG Rui-Yun1,2,*(
)
摘要:
bHLH (basic helix-loop-helix)作为植物界第二大类转录因子, 在植物应对环境胁迫响应中起着重要的调控作用。探究马铃薯(Solanum tuberosum L.) bHLH家族基因功能将为马铃薯改良和育种提供一定的理论依据。本研究克隆了马铃薯StFBH3基因(Gene ID: 102582309), 利用qPCR技术分析了不同逆境胁迫下StFBH3基因表达模式, 结果表明, StFBH3基因在马铃薯根和叶中的表达量较高, 且该基因的表达受渗透、高盐和脱落酸(abscisic acid, ABA)诱导; 以过表达StFBH3基因的马铃薯试管苗为材料, 在分别含有不同浓度甘露醇(mannitol)、NaCl和ABA的MS培养基中, 过表达StFBH3马铃薯株系的叶绿素含量显著高于野生型, 根长显著长于野生型。在干旱和高盐处理下, 土壤栽培的过表达马铃薯株系较野生型表现较强的耐受性, 叶片相对含水量、叶绿素含量和过氧化物歧化酶(SOD)活性显著高于野生型。qPCR分析发现, 干旱和盐胁迫处理下相关基因(KAT1)的表达量在过表达马铃薯株系中较野生型显著降低。以上结果表明, StFBH3基因可能在马铃薯对渗透、干旱和高盐等胁迫响应中起正向调控作用。本研究也为StFBH3基因在马铃薯中的生物学功能深入理解提供一定的参考依据。
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