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首页> 外文期刊>Breeding science >Identification and characterization of genomic regions associated with nitrogen dynamics in rice plants (Oryza sativa L.).
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Identification and characterization of genomic regions associated with nitrogen dynamics in rice plants (Oryza sativa L.).

机译：鉴定和鉴定与水稻中氮动态相关的基因组区域（Oryza sativa L.）。

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摘要

In rice (Oryza sativa L.) plants, accumulation and remobilization of nitrogen (N) are essential physiological processes that determine grain yield and quality. The objectives of the present study were to identify and characterize the genomic regions associated with this N dynamics by quantitative trait locus (QTL) analysis. In the present study, 191 recombinant inbred lines (F7) derived from a cross between Milyang 23 (Indica-type) and Akihikari (Japonica-type) were repeatedly evaluated for leaf nitrogen (N) concentration throughout four cropping seasons in Joetsu, Japan and Los Ba.os, Philippines, to perform interval mappings using a 182 RFLP marker-based linkage map. The locations and effects of the QTLs detected showed that the N dynamics was controlled by 15 genomic regions classified into three groups. Four regions in Group I (chromosomes 1, 2, 7 and 8) affected only the N concentration before heading, i.e., N accumulation during the vegetative phase; whereas eight regions in Group II (chromosomes 2, 3, 4, 6, 7, 9, 10 and 12) affected the N concentration after heading, i.e., N remobilization during the reproductive phase. Only three regions (chromosomes 1, 2 and 10) in Group III exerted effects on both N concentrations in the vegetative and reproductive phases. In 12 of these 15 regions, expression of the QTLs depended on the cropping seasons and sites. Statistical tests enabled to detect significant genotype . stage and genotype . season interaction effects for nine and eight regions, respectively. Characterization of the 15 regions demonstrated that the genetic control of N dynamics involves a number of genes whose effects were enhanced or suppressed by plant ontogeny and the growth environment.
机译：在水稻（Oryza sativa L.）植物中，氮（N）的积累和迁移是决定谷物产量和品质的重要生理过程。本研究的目的是通过定量性状基因座（QTL）分析来鉴定和表征与此N动态相关的基因组区域。在本研究中，对来自日本上越市和日本上越市四个种植季节的Milyang 23（In型）和Akihikari（粳型）之间的杂交衍生的191个重组自交系（F7）进行了反复评估，评估了叶氮（N）的浓度。菲律宾Los Ba.os，使用基于182 RFLP标记的链接图执行区间映射。检测到的QTL的位置和影响表明N动力学受15个分为三类的基因组区域控制。第一组的四个区域（染色体1、2、7和8）仅影响抽穗前的氮浓度，即在营养期氮的积累;而第二组中的八个区域（染色体2、3、4、6、7、9、10和12）影响抽穗后的N浓度，即生殖阶段的N迁移。第三组中只有三个区域（1、2和10号染色体）对营养期和生殖期的氮含量均产生影响。在这15个地区中的12个地区，QTL的表达取决于种植季节和地点。统计测试能够检测重要的基因型。分期和基因型。九个和八个区域的季节相互作用影响。 15个区域的特征表明，氮动力学的遗传控制涉及许多基因，这些基因的作用被植物个体发育和生长环境所增强或抑制。

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