论文部分内容阅读
缺磷是抑制全球水稻产量主要因素之一。本研究利用Asomonori(粳型)/IR24(籼型)杂交重组自交株系,对5个水稻苗期性状(相对苗高、相对根长、相对根重、相对苗重以及相对总重)在缺磷条件下的响应QTL进行定位。共检测到20个水稻苗期生长对缺磷响应的QTL位点,分别位于第1(4QTLs)、第4(4QTLs)、第5(2QTLs)、第7、第8(4QTLs)、第9(2QTLs)、第11(2QTLs)和第12号染色体上,其中13个QTLs位于与C3029C、XNpb302、C621B、C621C、R2976和C1263分子标记紧密连锁的6个基因组区域上。另外,每个性状均能从双亲中检测到正负效应QTL位点,这些能解释重组自交系群体中出现超亲和连续分布的现象。本文主要报道了水稻第5、第7和第11染色体上存在水稻苗期生长对缺磷响应的QTL位点。研究表明,该结果及其中检测到的QTLs两侧的连锁分子标记可用于水稻苗期耐低磷性分子育种。
Phosphorus deficiency is one of the main factors inhibiting global rice production. In this study, we used Asomonori (japonica) / IR24 (indica) hybrid inbred lines to study the seedling traits (relative height, relative root length, relative root weight, relative seedling weight and relative total weight) Response to QTL for P deficiency. A total of 20 QTL loci for response to phosphorus deficiency were detected at seedling stage 4 (4QTLs), 4 (4QTLs), 5QTLs (2QTLs), 7QQs (8QQQs), 9QTLs 2 QTLs), 11 (2QTLs) and 12 chromosomes, of which 13 were located in 6 genomic regions closely linked to the C3029C, XNpb302, C621B, C621C, R2976 and C1263 molecular markers. In addition, positive and negative QTLs were detected from both parents in each trait, which could explain the phenomenon of over-affinity and continuous distribution in the population of recombinant inbred lines. This paper mainly reports the QTL loci on the 5th, 7th and 11th chromosomes of rice in response to phosphorus deficiency at seedling stage. The results showed that the results and the linked molecular markers flanked by QTLs could be used for molecular breeding of low-phosphorus-tolerant rice in seedling stage.