A thermo-insensitive pale green leaf mutant （pgl2） was isolated from T-DNA inserted transgenic lines of rice （Oryza sativa L. subsp, japonica cv. Nipponbare）. Genetic analysis indicated that the phenotype was caus...A thermo-insensitive pale green leaf mutant （pgl2） was isolated from T-DNA inserted transgenic lines of rice （Oryza sativa L. subsp, japonica cv. Nipponbare）. Genetic analysis indicated that the phenotype was caused by a recessive mutation in a single nuclear-encoded gene. To map the PGL2gene, an F2 population was constructed by crossing the mutant with Longtefu （Oryza sativa L. subsp, indica）. The PGL2 locus was roughly linked to SSR marker RM331 on chromosome 8. To finely map the gene, 14 new InDel markers were developed around the marker, and PGL2 was further mapped to a 2.37 Mb centromeric region. Analysis on chlorophyll contents of leaves showed that there was no obvious difference between the mutant and the wild type in total chlorophyll （Chl） content, while the ratio of Chl a / Chl b in the mutant was only about 1, which was distinctly lower than that in the wild type, suggesting that the PGL2 gene was related to the conversion between Chl a and Chl b. Moreover, the method of primer design around the centromeric region was discussed, which would provide insight into fine mapping of the functional genes in plant centromeres.展开更多
在水稻品种南粳41中发现了一个黄绿叶自然突变体,经过多代连续自交形成了稳定的突变系,命名为ygl11（t）,ygl11（t）整个生育期叶片都表现为黄绿色。对苗期、分蘖盛期、齐穗期突变体和野生型的叶绿素含量进行测定,ygl11（t）的叶绿素含...在水稻品种南粳41中发现了一个黄绿叶自然突变体,经过多代连续自交形成了稳定的突变系,命名为ygl11（t）,ygl11（t）整个生育期叶片都表现为黄绿色。对苗期、分蘖盛期、齐穗期突变体和野生型的叶绿素含量进行测定,ygl11（t）的叶绿素含量是野生型的45.7%~74.7%,叶绿素a含量是野生型的55.2%~87.5%,叶绿素b含量是野生型的12.5%~25.3%,ygl11（t）的类胡萝卜素的含量是野生型的62.3%~97.0%。ygl11（t）在分蘖盛期的净光合速率显著高于野生型,花后10d,ygl11（t）的净光合速率比野生型略低。对突变体叶片中叶绿体的超微结构进行观察,发现突变体叶绿体内的类囊体基粒片层数目减少且严重扭曲变形。遗传分析表明,ygl11（t）叶色性状受1对隐性核基因控制。利用SSR分子标记将YGL11（t）初步定位在水稻第10染色体的长臂上,进一步利用新开发的InDel和CAPS标记将YGL11（t）定位在58.1kb的物理距离内。对该区段内存在的开放阅读框进行序列分析,发现突变体ygl11（t）中编码叶绿素a氧化酶（chlorophyll a oxygenase 1）基因（OsCAO 1）的第9个外显子存在2个碱基缺失,从而导致提前出现终止密码子,初步分析OsCAO1即为YGL11（t）的候选基因。展开更多
文摘A thermo-insensitive pale green leaf mutant （pgl2） was isolated from T-DNA inserted transgenic lines of rice （Oryza sativa L. subsp, japonica cv. Nipponbare）. Genetic analysis indicated that the phenotype was caused by a recessive mutation in a single nuclear-encoded gene. To map the PGL2gene, an F2 population was constructed by crossing the mutant with Longtefu （Oryza sativa L. subsp, indica）. The PGL2 locus was roughly linked to SSR marker RM331 on chromosome 8. To finely map the gene, 14 new InDel markers were developed around the marker, and PGL2 was further mapped to a 2.37 Mb centromeric region. Analysis on chlorophyll contents of leaves showed that there was no obvious difference between the mutant and the wild type in total chlorophyll （Chl） content, while the ratio of Chl a / Chl b in the mutant was only about 1, which was distinctly lower than that in the wild type, suggesting that the PGL2 gene was related to the conversion between Chl a and Chl b. Moreover, the method of primer design around the centromeric region was discussed, which would provide insight into fine mapping of the functional genes in plant centromeres.
文摘在水稻品种南粳41中发现了一个黄绿叶自然突变体,经过多代连续自交形成了稳定的突变系,命名为ygl11（t）,ygl11（t）整个生育期叶片都表现为黄绿色。对苗期、分蘖盛期、齐穗期突变体和野生型的叶绿素含量进行测定,ygl11（t）的叶绿素含量是野生型的45.7%~74.7%,叶绿素a含量是野生型的55.2%~87.5%,叶绿素b含量是野生型的12.5%~25.3%,ygl11（t）的类胡萝卜素的含量是野生型的62.3%~97.0%。ygl11（t）在分蘖盛期的净光合速率显著高于野生型,花后10d,ygl11（t）的净光合速率比野生型略低。对突变体叶片中叶绿体的超微结构进行观察,发现突变体叶绿体内的类囊体基粒片层数目减少且严重扭曲变形。遗传分析表明,ygl11（t）叶色性状受1对隐性核基因控制。利用SSR分子标记将YGL11（t）初步定位在水稻第10染色体的长臂上,进一步利用新开发的InDel和CAPS标记将YGL11（t）定位在58.1kb的物理距离内。对该区段内存在的开放阅读框进行序列分析,发现突变体ygl11（t）中编码叶绿素a氧化酶（chlorophyll a oxygenase 1）基因（OsCAO 1）的第9个外显子存在2个碱基缺失,从而导致提前出现终止密码子,初步分析OsCAO1即为YGL11（t）的候选基因。
