化性是家蚕的重要生理特性,受第6染色体上的化性主基因V及Z染色体上的伴性成熟基因Lm的影响,伴性早熟基因Lme促进家蚕化性趋向多化性。采用多化性家蚕品种nistari和二化性家蚕品种p50配制BC1M群体[p50×(nistari×p50)],选择其...化性是家蚕的重要生理特性,受第6染色体上的化性主基因V及Z染色体上的伴性成熟基因Lm的影响,伴性早熟基因Lme促进家蚕化性趋向多化性。采用多化性家蚕品种nistari和二化性家蚕品种p50配制BC1M群体[p50×(nistari×p50)],选择其中734头产非滞育卵的雌蛾个体作为定位群体,以其基因组DNA为模板进行SSR标记的PCR扩增,应用高分辨率熔解曲线分析(HRM)技术进行各个标记位点的基因型分析,绘制出遗传总距离为12.91 c M的分子遗传连锁图,Lme基因位于标记s2734-299和s2734-525之间,与2个标记的遗传距离均为0.41 c M。s2734-299和s2734-525间的物理距离为226 kb,其间有18个预测基因,有2个属于DNA序列特异性结合转录因子基因,但尚不能判定这2个基因是否与Lme有明确的关联。展开更多
A rice pse（t） （premature senescence, tentatively） mutant line, was isolated from 4500 independent T-DNA inserted transgenic lines. The symptoms of premature senescence appeared more severely than those of the cont...A rice pse（t） （premature senescence, tentatively） mutant line, was isolated from 4500 independent T-DNA inserted transgenic lines. The symptoms of premature senescence appeared more severely than those of the control plants （Zhonghua 11, japonica） at the last development stage. To characterize the mutant and provide basic information on the candidate genes by mapping to a physical region of 220-kb, experiments were carried out in two phytotrons under controlled temperature of 24 ℃ and 28 ℃, respectively. The content of chlorophyll, soluble protein and MDA （malondialdehyde）, net photosynthesis, the antioxidant enzyme activities of SOD （superoxide dismuase） （EC 1.15.1.1 ） and POD （peroxidase） （EC 1.11.1.7） and the peptidase activities of leaves were measured from top to bottom according to the leaf positions at the flowering stage. Compared with the control plant, the mutant showed the following characteristics： （1） Higher net photosynthesis rate （Pn） appeared in the 1st and 2nd leaves, contents of chlorophyll and soluble protein were also higher in the 1st leaf; （2） The activities of SOD, POD and peptidase were higher according to the leaf position from top to bottom; （3） The symptom of premature senescence was accelerated in the mutant at 28 ℃ treatment. The MDA content and the SOD and POD activities between the 24 ℃ and 28 ℃ treatment mutants were not significantly different. Content of chlorophyll and soluble protein of leaves mutant decreased rapidly at 28 ℃ treatment. The results show thatpse（t） is sensitive to high temperature. The probable function of PSE（T） is discussed.展开更多
文摘化性是家蚕的重要生理特性,受第6染色体上的化性主基因V及Z染色体上的伴性成熟基因Lm的影响,伴性早熟基因Lme促进家蚕化性趋向多化性。采用多化性家蚕品种nistari和二化性家蚕品种p50配制BC1M群体[p50×(nistari×p50)],选择其中734头产非滞育卵的雌蛾个体作为定位群体,以其基因组DNA为模板进行SSR标记的PCR扩增,应用高分辨率熔解曲线分析(HRM)技术进行各个标记位点的基因型分析,绘制出遗传总距离为12.91 c M的分子遗传连锁图,Lme基因位于标记s2734-299和s2734-525之间,与2个标记的遗传距离均为0.41 c M。s2734-299和s2734-525间的物理距离为226 kb,其间有18个预测基因,有2个属于DNA序列特异性结合转录因子基因,但尚不能判定这2个基因是否与Lme有明确的关联。
基金Project supported by the National Basic Research Program (973) of China (No. G19990116-1)the High-Tech Research and Develop-ment Program (863) of China (No. 2002AA2Z1001)the State Key Laboratory of Rice Biology and partly granted (Nos. 30471051 and 30470933) from National Natural Science Foundation of China
文摘A rice pse（t） （premature senescence, tentatively） mutant line, was isolated from 4500 independent T-DNA inserted transgenic lines. The symptoms of premature senescence appeared more severely than those of the control plants （Zhonghua 11, japonica） at the last development stage. To characterize the mutant and provide basic information on the candidate genes by mapping to a physical region of 220-kb, experiments were carried out in two phytotrons under controlled temperature of 24 ℃ and 28 ℃, respectively. The content of chlorophyll, soluble protein and MDA （malondialdehyde）, net photosynthesis, the antioxidant enzyme activities of SOD （superoxide dismuase） （EC 1.15.1.1 ） and POD （peroxidase） （EC 1.11.1.7） and the peptidase activities of leaves were measured from top to bottom according to the leaf positions at the flowering stage. Compared with the control plant, the mutant showed the following characteristics： （1） Higher net photosynthesis rate （Pn） appeared in the 1st and 2nd leaves, contents of chlorophyll and soluble protein were also higher in the 1st leaf; （2） The activities of SOD, POD and peptidase were higher according to the leaf position from top to bottom; （3） The symptom of premature senescence was accelerated in the mutant at 28 ℃ treatment. The MDA content and the SOD and POD activities between the 24 ℃ and 28 ℃ treatment mutants were not significantly different. Content of chlorophyll and soluble protein of leaves mutant decreased rapidly at 28 ℃ treatment. The results show thatpse（t） is sensitive to high temperature. The probable function of PSE（T） is discussed.
