Temporal and Spatial Variations of Carbohydrate Content in Rice Leaf Sheath and Their Varietal Differences

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Author(s)

    • HE Hai Yan
    • Graduate School of Agricultural and Life Sciences, the University of Tokyo
    • KOIKE Michiko
    • Graduate School of Agricultural and Life Sciences, the University of Tokyo
    • OHSUGI Ryu
    • Graduate School of Agricultural and Life Sciences, the University of Tokyo
    • YAMAGISHI Tohru
    • Graduate School of Agricultural and Life Sciences, the University of Tokyo

Abstract

In rice plant, carbohydrates accumulated in leaf sheaths before heading are translocated to grain and affect yield formation greatly. To clarify the intrinsic mechanism of carbohydrate metabolism in the leaf sheath, we investigated the temporal and spatial variations of carbohydrate metabolism in the third leaf sheath counted from the top and their varietal differences. The results revealed that the amount of carbohydrate decreased from the base to the tip of the leaf sheath, irrespective of variety and developmental stage. However, the proportion of starch content in the basal one-fifth of the leaf sheath to that in the whole sheath varied from 35% to 60% with the variety. Comparing the activities of enzymes related to starch metabolism at the base, middle and tip of the leaf sheath in IR65598-112-2 (New plant type) with those in Nipponbare, the activities of ADP-glucose pyrophosphorylase, branching enzyme and granule-bound starch synthase (GBSS) showed varietal differences. Particularly, the activity of GBSS may play an important role in the varietal difference in spatial variation of starch content in the leaf sheath. In IR65598-112-2, the sucrose content in the leaf sheath was extremely high, suggesting that sucrose may be one of the carbohydrate reserves in this line.

Journal

  • Plant Production Science

    Plant Production Science 8(5), 546-552, 2005-12-01

    The Crop Science Society of Japan

References:  23

Cited by:  2

Codes

  • NII Article ID (NAID)
    110002961793
  • NII NACSIS-CAT ID (NCID)
    AA11162156
  • Text Lang
    ENG
  • Article Type
    Journal Article
  • ISSN
    1343943X
  • Data Source
    CJP  CJPref  NII-ELS  J-STAGE 
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