Identification and characterization of quantitative trait loci for root elongation by using introgression lines with genetic background of Indica-type rice variety IR64

Mitsuhiro Obara, Tsutomu Ishimaru, Tomomi Abiko, Daisuke Fujita, Nobuya Kobayashi, Seiji Yanagihara, Yoshimichi Fukuta

研究成果: ジャーナルへの寄稿学術誌査読

24 被引用数 (Scopus)

抄録

The root is the sole organ taking up water and nutrients from soils. Hence, root system architecture (RSA) is important for enhancing high-level and stable rice (Oryza sativa L.) production. However, the genetic improvement of RSA has received less attention than yield and yield components. Here, we aimed to identify and characterize quantitative trait loci (QTLs) for RSA by determining the maximum root length (MRL) of seedlings grown hydroponically under various concentrations of NH4 +. We used a total of 280 introgression lines (ILs) with an Indica-type variety IR64 genetic background, consisting of ten sibling ILs groups, to detect the QTLs. Greater variation of MRL was found in three sibling ILs groups. In total, five QTLs were detected by single marker analyses: two each on chromosomes 5 and 6 and one on chromosome 7. Among them, the most effective QTL was detected on a segment derived from IR69093-41-2-3-2 (YP5), which was localized to the long-arm of chromosome 6. The QTL, designated as qRL6.4-YP5, concerned in root elongation. MRL and total root length of a near-isogenic line (NIL) for qRL6.4-YP5 were significantly (15.2-24.6 %) higher than those of IR64 over a wide range of NH4 + concentrations. Root number and weight of the NIL were the same as those of IR64. These results indicated that qRL6.4-YP5 was a constitutive QTL for root length in response to change in nitrogen concentrations. To enhance yield potential by improving RSA, qRL6.4-YP5 might help to improve root development in rice molecular breeding programs with marker-assisted selection.

本文言語英語
ページ(範囲)267-277
ページ数11
ジャーナルPlant Biotechnology Reports
8
3
DOI
出版ステータス出版済み - 5月 2014
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • バイオテクノロジー
  • 植物科学

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