Mapping of QTLs controlling seedling establishment using a direct seeding method in rice
Mapping of QTLs controlling seedling establishment using a direct seeding method in rice
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DOI：
10.1270/jsbbs.60.353
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发表时间：
2010-12-01
期刊：
影响因子：
2.4
通讯作者：
Fujino, Kenji
中科院分区：
文献类型：
--
作者：
Iwata, Natsuko;Shinada, Hiroshi;Fujino, Kenji
低温是影响植物生长和发育的最常见的环境胁迫之一，并严重限制植物生产力。耐低温是温带地区和热带、亚热带高海拔地区水稻育种计划的一个重要目标。水稻在低温下秧苗阶段生长旺盛，是直播法稳定成苗（SES）的一个重要特征，直播法是将水稻直接播种到淹水的田地中。本研究的目的是使用 Arroz Da Terra 和 Italica Livorno 作为供体亲本的回交自交系 (BIL) 的 3 个作图群体来识别控制 SES 的 QTL。本研究通过田间评价系统对SES进行评价，由于稻田水稻种植SES环境条件的复杂性，该系统在当前的水稻育种项目中使用。总共鉴定了 9 个 SES 染色体区域，解释了总表型变异的 10.9% 至 25.6%。对于除 qSES5-2 之外的所有 QTL，来自供体父母的等位基因增加了表型值。这些QTL应该有助于改善低温地区水稻育种计划的SES。
Low-temperature is one of the most common environmental stresses that affect plant growth and development and places a major limit on plant productivity. Tolerance to low-temperature is an important objective of rice breeding programs in temperate areas and at high altitudes in tropical and sub-tropical areas. Vigorous rice growth during the seedling stage at low-temperature is an important characteristic for stable seedling establishment (SES) in direct seeding methods, in which rice is sown directly into a flooded field. The aim of this study was to identify QTLs controlling SES using 3 mapping populations of backcrossed inbred lines (BILs) with Arroz Da Terra and Italica Livorno as the donor parents. SES was evaluated by a field evaluation system in this study, which is used in current rice breeding programs because of the complexity of environmental conditions in SES in rice cultivation in a paddy field. A total of 9 chromosomal regions for SES were identified, which explained 10.9% to 25.6% of total phenotypic variation. For all of QTLs except for qSES5-2, alleles from the donor parents increased phenotypic values. These QTLs should be useful for the improvement of SES in rice breeding programs in low-temperature regions.