Mapping of quantitative trait loci associated with chilling tolerance in maize (Zea mays L.) seedlings grown under field conditions
Mapping of quantitative trait loci associated with chilling tolerance in maize (Zea mays L.) seedlings grown under field conditions
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DOI：
10.1093/jxb/eri108
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发表时间：
2005-04-01
影响因子：
6.9
通讯作者：
Leipner, J
中科院分区：
文献类型：
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作者：
Jompuk, C;Fracheboud, Y;Leipner, J
通过对瑞士田间条件下生长的分离 F-2:3 群体进行 QTL 分析，研究了低生长温度对玉米形态生理性状的影响。在苗期对叶绿素荧光参数、叶片绿度、叶面积、地上部干重和地上部氮含量进行了两年的调查。玉米每年在两个日期播种；因此，早播的植物暴露在低温下，而晚播的植物则在更有利的条件下发育。参与低温下光合机构功能的主要 QTL 在寒冷环境中保持稳定，并且在之前的研究中也在次优温度的受控条件下进行了鉴定。基于QTL分析，叶绿素荧光参数与叶片绿度之间存在中等关系。这表明光合作用机制的范围和功能可能处于不同的遗传控制之下。田间低温下发育的植物光合器官的功能并未明显影响生物量积累；由于叶面积和茎干重的 QTL 之间不存在共位，因此在田间凉爽条件下的苗期生物量积累似乎不受碳限制。
The effect of low growth temperature on morpho-physiological traits of maize was investigated by the means of a QTL analysis in a segregating F-2:3 population grown under field conditions in Switzerland. Chlorophyll fluorescence parameters, leaf greenness, leaf area, shoot dry weight, and shoot nitrogen content were investigated at the seedling stage for two years. Maize was sown on two dates in each year; thus, plants sown early were exposed to low temperature, whereas those sown later developed under more favourable conditions. The main QTLs involved in the functioning of the photosynthetic apparatus at low temperature were stable across the cold environments and were also identified under controlled conditions with suboptimal temperature in a previous study. Based on the QTL analysis, relationships between chlorophyll fluorescence parameters and leaf greenness were moderate. This indicates that the extent and functioning of the photosynthetic machinery may be under different genetic control. The functioning of the photosynthetic apparatus in plants developed at low temperature in the field did not noticeably affect biomass accumulation; since there were no co-locations between QTLs for leaf area and shoot dry weight, biomass accumulation did not seem to be carbon-limited at the seedling stage under cool conditions in the field.