作物学报 ›› 2021, Vol. 47 ›› Issue (2): 224-236.doi: 10.3724/SP.J.1006.2021.01042
孟钰玉1(
), 魏春茹1, 范润侨1, 于秀梅1,2,*(
), 王逍冬2, 赵伟全2, 魏新燕2, 康振生3, 刘大群2
MENG Yu-Yu1(
), WEI Chun-Ru1, FAN Run-Qiao1, YU Xiu-Mei1,2,*(
), WANG Xiao-Dong2, ZHAO Wei-Quan2, WEI Xin-Yan2, KANG Zhen-Sheng3, LIU Da-Qun2
摘要:
为探究韧皮部蛋白2 (Phloem protein 2, PP2)基因在小麦(Triticum aestivum)响应逆境胁迫中的功能及作用机制, 本文以小麦抗叶锈病近等基因系TcLr15为材料获得一个小麦韧皮部蛋白2基因TaPP2-A13。该基因编码一个由298个氨基酸组成的亲水性蛋白质, 相对分子量为33.18 kD, 等电点为6.36。其N端为F-box结构域, C端具有典型的PP2结构域, 属于F-box/PP2 (FBP)亚家族成员。TaPP2-A13与禾本科植物中PP2-A13蛋白的亲缘关系较近。表达模式分析表明, TaPP2-A13的表达受叶锈菌(Puccinia triticina)侵染的诱导, 且感病组合中表达更强。用脱落酸(ABA)、水杨酸(SA)和甲基茉莉酸(MeJA)处理后, TaPP2-A13总体呈现上调表达趋势。利用聚乙二醇(PEG)和H2O2处理后, 小麦TaPP2-A13显著下调表达, 而NaCl处理后TaPP2-A13呈现先上调后下调的表达趋势。亚细胞定位结果表明TaPP2-A13在细胞核和细胞质均有分布。以构建的重组载体BD-TaPP2-A13为诱饵筛选酵母文库, 获得11种可能与TaPP2-A13互作的蛋白, 酵母双杂交(Yeast 2 Hybrid, Y2H)确定其中的5种蛋白TaPP2C5、TaSLY1、TaCHI、TaRbcS和TaSKP1分别与TaPP2-A13存在相互作用。进一步利用BiFC和Co-IP确认TaSKP1与TaPP2-A13两种蛋白质之间的相互作用关系, 推测TaPP2-A13可能为SCF复合体成员。本研究结果为深入解析TaPP2-A13蛋白的功能, 并探究其调控网络奠定了基础。
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