Dynamics of Starch Content and the Expression Profile of the Genes Involved in Starch Metabolism in Culms of Rice Recombinant Inbred Lines after Heading

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  • Kubo Ryuichi
    Faculty of Biology-Oriented Science and Technology, Kinki University
  • Horibata Akira
    Faculty of Biology-Oriented Science and Technology, Kinki University
  • Kato Tsuneo
    Faculty of Biology-Oriented Science and Technology, Kinki University

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Other Title
  • イネ組換え近交系の出穂後の稈におけるデンプン含量およびデンプン代謝関連遺伝子発現量の推移
  • イネ クミカエ キンコウケイ ノ シュッスイ ゴ ノ カン ニ オケル デンプン ガンリョウ オヨビ デンプン タイシャ カンレン イデンシ ハツゲンリョウ ノ スイイ

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Abstract

Photoassimilates are accumulated as starch at rice stems before heading, are converted to sucrose, and are translocated to panicles after heading. Efficient translocation of photoassimilates to panicles should be a key to improve poor grain filling of rice cultivars with numerous spikelets per panicle. On the other hand, rice cultivars accumulating photoassimilates at stems should be utilized in the development of forage cultivars as whole crop silage. In this study, we investigated the starch content of the culms on the first node below frag leaf after heading for three years (in 2009, 2010 and 2012), using 9 rice recombinant inbred lines (RILs) (derived from Nakateshinsenbon/Milyang 23) which showed characteristic dynamics of non-structural carbohydrate contents after heading. Among these RILs, we selected three RILs showing stable dynamics in starch contents in culms among different years, and examined the expression of genes involved in starch metabolism in this organ. Results showed that one RIL, which increased the starch content at later stages of grain filling, tended to increase the expression levels of genes for soluble starch synthase (SSIIIB) and sucrose synthase (RSUS1), both of which are involved in starch synthesis pathway. However, other two RILs, which did not show such re-accumulation of the starch content, also showed no increase in the expression levels of these two genes. These results suggested that the expression of these two genes would contribute to the re-accumulation of starch content at the first node culm, and could be available to develop forage rice cultivars.

Journal

  • Journal of Crop Research

    Journal of Crop Research 59 (0), 17-22, 2014

    The Society of Crop Science and Breeding in Kinki, Japan

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