作物学报 ›› 2018, Vol. 44 ›› Issue (6): 814-823.doi: 10.3724/SP.J.1006.2018.00814
Jian-Wei WANG1,Xiao-Lan HE1,*(),Wen-Xu LI3,Xin-Hong CHEN2
摘要:
果聚糖与植物碳素分配和抗逆性有关, 在逆境胁迫中具有保护植物细胞免受伤害的作用。为明确不同来源的果聚糖1-果糖基转移酶基因在植物抗逆中的作用, 本研究分别以小麦近缘属植物华山新麦草(Psathyrostachys huashanica, 2n = 2x = 14, NsNs)、簇毛麦(Dasypyrum villosum, 2n = 2x = 14, VV)、大赖草(Leymus racemosus, 2n = 4x = 28, NsNsXmXm)为材料, 利用RACE技术克隆获得3个果聚糖1-果糖基转移酶1-FFT基因, 分别命名为Ph-1-FFT、Dv-1-FFT和Lr-1-FFT。3个基因的完整开放阅读框长度分别为1989、1950和1989 bp, 编码662、649和662个氨基酸, 其编码氨基酸序列均含有果糖基转移酶保守结构域。氨基酸序列比对及进化树分析表明, Ph-1-FFT和Lr-1-FFT高度同源, 与Dv-1-FFT位于不同的分支, 而Dv-1-FFT与普通小麦、圆锥小麦、西尔斯山羊草和乌拉尔图小麦1-FFT具有高度同源性。采用基因重组技术构建p1300-35SN-Ph-1-FFT/Dv-1-FFT/Lr-1-FFT表达载体, 利用农杆菌介导法将3个载体分别转入烟草品种W38中。对经过抗性筛选、PCR和RT-PCR验证的转基因植株鉴定发现, 其抗旱和抗寒性明显高于对照, 不同来源的1-FFT转基因植株的抗逆性差异不明显; 在逆境胁迫条件下, 转基因株系的果聚糖、可溶性糖、脯氨酸含量都显著高于对照, 而丙二醛的含量显著低于对照, 不同来源的1-FFT转基因植株的果聚糖、可溶性糖、脯氨酸和丙二醛含量差异不显著。本研究表明, Ph-1-FFT、Dv-1-FFT和Lr-1-FFT基因均是典型的GH32基因家族成员, 其表达可能对提高烟草抗旱和抗寒性起作用。
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