Relationship between the Spreading-Stub Phenotype of Rice and Negative Gravitropism of Stems at Tillering Stage

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  • Kato Tsuneo
    Faculty of Biology-Oriented Science and Technology, Kindai University
  • Horibata Akira
    Faculty of Biology-Oriented Science and Technology, Kindai University

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Other Title
  • イネにおける株開張性と茎の負の重力屈性との関係

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Description

The spreading-stub phenotype in rice could be a novel plant architecture in rice breeding. As a factor underlying this phenotype, weakened negative gravitropism of the stems caused by a shortage of starch granules in pulvinus cells has been proposed. This study evaluated one erect-type (non-spreading) cultivar and two spreading-type cultivars, which had the already reported to have nucleotide substitutions in the fourth intron of TAC1, for their negative gravitropism at the tillering stage. The degree of negative gravitropism was quantified from the responses to slanting treatment, in which plants in pots were slanted at 45° from the perpendicular, and also their recovery after plants were returned to the upright position. Starch content of the leaf sheath bases was also determined. Results showed that the two spreading-type cultivars clearly rose up less, and expressed weaker negative gravitropism than the erect-type cultivar in response to the two treatments during the tillering stage. The shortage of starch in the stem bases, including pulvinus cells, was also implied in these spreading-type cultivars. The present results, therefore, support the mechanism of spreading-stub expression in rice.

Journal

  • Journal of Crop Research

    Journal of Crop Research 62 (0), 1-5, 2017

    The Society of Crop Science and Breeding in Kinki, Japan

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