作物学报 ›› 2016, Vol. 42 ›› Issue (07): 966-975.doi: 10.3724/SP.J.1006.2016.00966
郭丹,施勇烽,王惠梅,张晓波,宋莉欣,徐霞,贺彦,郭梁,吴建利*
GUO Dan,SHI Yong-Feng,WANG Hui-Mei,ZHANG Xiao-Bo,SONG Li-Xin,XU Xia,HE Yan,GUO Liang,WU Jian-Li*
摘要:
通过EMS (ethane methyl sulfonate)诱变籼稻品种IR64获得一个稳定遗传的显性斑点叶突变体HM113。在大田环境下,突变体褐色斑点在播种后3周的叶片上产生,始穗期扩散至叶鞘。与野生型IR64相比,突变体HM113的株高、结实率和千粒重等农艺性状显著下降,光合色素含量、净光合速率和可溶性蛋白含量显著降低。同时突变体CAT和SOD活性显著降低,POD活性显著上升。组织化学分析显示,突变体叶片中积累了大量活性氧,且斑点处细胞坏死。白叶枯病菌接种结果显示,HM113是一个广谱抗性增强的突变体。实时定量PCR分析表明HM113中防卫反应基因AOS2、PAL4、PR10和PR1b等的表达大幅上调。遗传分析表明,突变体褐斑性状受单显性基因(SplHM113)控制,利用图位克隆法将该基因定位在第7染色体长臂RM21605和RM418之间,物理距离约为308 kb。本研究为褐斑基因SplHM113的克隆与功能分析奠定了基础。
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