Dissecting the genetic basis of root vigor : applications for improving rice for a changing world

在JSPS奖学金期间，我进行了一项研究，重点是了解水稻的磷(P)效率机制。本研究以两个水稻育种亲本及其杂交群体为材料，对其在低磷土壤上的根系活力相关性状和磷效率进行了对比研究。我进行了数量性状基因座(QTL)分析，以确定磷高效根系性状的潜在遗传基础。我的分析确定了4号染色体上的一个QTL，该QTL可能有助于在低磷条件下延长根长。我还跟踪了当磷的有效性被实验降低时，这些不同的磷高效水稻基因型的反应。结果表明，磷高效基因型通过表达与磷胁迫相关的基因来快速响应低磷可利用性。

During my JSPS Fellowship, I conducted research focusing on understanding phosphorus(P) efficiency mechanism in rice. My experimental material included two rice breeding parents and their crossing population contrasting in root-vigor related traits and P efficiency in low P soils. I carried out quantitative trait loci (QTL) analysis to determine the underlying genetic basis of the P-efficient root traits. My analysis identified a QTL on chromosome 4 potentially contributing to elongating root length in low P conditions. I also followed up how these contrasting P efficient rice genotypes responded to when P availability was experimentally reduced. My results revealed that the high P-efficient genotype rapidly responded to low P availability by expressing the P-stress related genes.