作物学报 ›› 2014, Vol. 40 ›› Issue (07): 1182-1189.doi: 10.3724/SP.J.1006.2014.01182
桑贤春,徐芳芳,朱小燕,邢亚迪,何沛龙,张长伟,杨正林,何光华*
SANG Xian-Chun,XU Fang-Fang,ZHU Xiao-Yan,XING Ya-Di,HE Pei-Long,ZHANG Chang-Wei, ANG Zheng-Lin,HE Guang-Hua*
摘要:
叶片早衰直接影响作物产量和品质, 鉴定早衰突变体、图位克隆调控基因对于研究植物衰老机理具有重要的意义。以甲基磺酸乙酯诱变水稻籼型恢复系缙恢10号, 获得一个早衰突变体esl5 (early senescent leaf mutant 5), 本文对其进行了形态鉴定、细胞学观察、理化分析和基因定位等研究。结果表明, 与野生型相比, esl5的苗期叶片正常, 分蘖期呈黄绿色, 孕穗期开始叶片中上部逐渐黄化衰老; 衰老部位的细胞结构异常, 细胞膜降解, 叶绿体基质片层疏松、排列不规则, 光合色素含量和光合速率极显著下降。此外, esl5的·OH和H2O2含量极显著升高, SOD和CAT的活性则极显著降低。与野生型相比, esl5的生育期延长了20 d左右, 千粒重显著增加, 穗粒数、实粒数和结实率则显著降低。esl5受1对隐性核基因调控, 精细定位在第3染色体Indel标记Indel03-1和Indel03-2之间83.4 kb的物理范围内, 包含11个注释基因, 这为ESL5的克隆和功能研究奠定了基础, 也有利于水稻品种的遗传改良。
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