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Genotypic Variation in Root Growth Angle in Rice (Oryza sativa L.) and its Association with Deep Root Development in Upland Fields with Different Water Regimes

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Abstract

Deep root development, which is important for the drought resistance in rice (Oryza sativa L.), is a complex trait combining various root morphologies. The objective of this study was to elucidate genotypic variation in deep root development in relation to morphological indicators such as vertical root distribution and root growth angle. Two experiments were conducted: one on upland fields, and one in pots and fields. In experiment 1, the root systems of six rice cultivars on upland fields were physio-morphologically analyzed under different water regimes (irrigated and intermittent drought conditions during panicle development). In experiment 2, cultivar differences in root growth angles were evaluated with 12 cultivars using the basket method under irrigated conditions. No cultivar × environment interactions were found for total root length or deep root length between irrigated and drought conditions in experiment 1. This suggests that constitutive root growth, which is genetically determined, is important for deep root development under intermittent drought conditions during reproductive stage. Among root traits, the deep root ratio (i.e., deep root weight divided by total root weight) was most closely related to deep root length under both water regimes. This suggested that vertical root distribution constitutively affects deep root length. Significant genotypic variation existed in the nodal root diameter and root growth angle of upland rice in experiment 2. It was considered that genotypes with thick roots allocated more assimilates to deep roots through root growth angles higher to the horizontal plane on upland fields. This is the first report on genotypic variation in the root growth angle of rice on upland fields. It should prove useful for rough estimations of genotypic variation in the vertical root distribution of upland rice because root growth angle is rapidly and easily measured.

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Acknowledgments

We thank Mr N. Washizu, Mr K. Ichikawa, Ms S. Nakata, Mr H. Kimura, Mr R. Soga, and Mr H. Kubota (Field Production Science Center, The University of Tokyo) for their technical assistance in carrying out these experiments, and for collecting meteorological data.

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Authors and Affiliations

  1. Field Production Science Center, Graduate School of Agriculture and Life Sciences, The University of Tokyo, Midori-cho 1-1-1 Nishitokyo, Tokyo, 188-0002, Japan

    Yoichiro Kato, Akihiko Kamoshita & Junko Yamagishi

  2. AE-Bio, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo, 113-8657, Japan

    Jun Abe

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  1. Yoichiro Kato
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  2. Jun Abe
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  3. Akihiko Kamoshita
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  4. Junko Yamagishi
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Correspondence to Junko Yamagishi.

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Kato, Y., Abe, J., Kamoshita, A. et al. Genotypic Variation in Root Growth Angle in Rice (Oryza sativa L.) and its Association with Deep Root Development in Upland Fields with Different Water Regimes. Plant Soil 287, 117–129 (2006). https://doi.org/10.1007/s11104-006-9008-4

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  • DOI: https://doi.org/10.1007/s11104-006-9008-4

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