作物学报 ›› 2016, Vol. 42 ›› Issue (11): 1656-1665.doi: 10.3724/SP.J.1006.2016.01656
夏雪,马晨雨,白青河,冯园园,王顺友,王喜,周青利,席章营*
XIA Xue, MA Chen-Yu, BAI Qing-He, FENG Yuan-Yuan, WANG Shun-You, WANG Xi, ZHOU Qing-Li, and XI Zhang-Ying*
摘要:
玉米籽粒发育及产量是玉米重要的经济性状。本研究以玉米骨干自交系郑58为试材,采用同源克隆法得到一个与玉米籽粒发育相关的基因ZmMADS-RIN。该基因的cDNA全长859 bp,开放阅读框为768 bp,编码255个氨基酸,与玉米B73中所对应的cDNA的编码区序列相比,共有6个SNPs位点的差异,3个氨基酸残基发生了变化。生物信息学分析表明,ZmMADS-RIN蛋白的相对分子量为29.23 kD,理论等电点(pI)为8.84,是一种亲水性蛋白,不含信号肽序列,也不含跨膜结构;具有5个磷酸化位点;二级结构中含有50.20%的α-螺旋(alpha helix)、27.45%的无规则卷曲(random coil)、14.51%的延伸链(extended strand)和7.84%的β-转角(beta turn);该蛋白位于细胞核内;其氨基酸序列中含有高度保守的MADS结构域、相对保守的K结构域、低保守的I结构域和最不稳定的C结构域,是典型的MIKC型MADS-box蛋白;系统进化树分析表明,ZmMADS-RIN蛋白属于AGL6分枝,与水稻基因OsMADS6的相似性最高,为89%。ZmMADS-RIN基因在玉米自交系郑58的籽粒中特异表达,在根及不同时期的叶片中没有检测到表达信号。荧光定量PCR结果显示,ZmMADS-RIN基因的表达量在玉米籽粒发育的不同阶段呈一定规律的变化,在授粉后0~20 d,呈上调表达趋势,授粉后25 d表达量迅速下降至较低水平,而在授粉后30~40 d则检测不到其表达。推测该基因可能与玉米籽粒的发育有关。
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