Development and Distribution of Root System in Two Grain Sorghum Cultivars Originated from Sudan under Drought Stress(Crop Physiology and Ecology)

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概要

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• The difference in rooting pattern between two grain sorghum cultivars differing in drought tolerance was investigated under drought stress. The cultivars, Gadambalia (drought-tolerant) and Tabat (drought-susceptible), were grown in bottomless wooden or acrylic root boxes to examine root parameters. Gadambalia consistently exhibited higher dry matter production and leaf water potential than Tabat under drought stress in both root boxes. In the experiment with wooden root boxes, under a drought condition, Gadambalia extracted more water from deep soil layers (1.1-1.5m), which was estimated from the reduction in soil water content, than Tabat. This was because Gadambalia had a significantly higher root length density in these soil layers. The high root length density was due to enhanced lateral root development in Gadambalia. In the other experiment with acrylic root boxes, though total root length in the upper soil layer (0-0.5m) was declined by limited irrigation in both cultivars, the reduction in Gadambalia was moderate compared with that in Tabat owing to the maintenance of fine root growth. Unlike Tabat, Gadambalia had an ability to produce the nodal roots from higher internodes even under drought, which resulted in the high nodal root length of Gadambalia. The growth angle of nodal roots was significantly correlated with root diameter, and the nodal roots from the higher internodes had large diameters and penetrated into the soil more vertically. These results indicate that the responses of roots (i.e. branching and/or growth of lateral root, and nodal root emergence from higher internodes) to soil dryness could be associated with the drought tolerance of Gadambalia.

• 日本作物学会の論文

著者

• MORITA Shigenori

  Graduate School of Agricultural and Life Sciences, The University of Tokyo

• Morita Shigenori

  Field Production Sci. Center Graduate School Of Agricultural And Life Sciences The Univ. Of Tokyo

• Araki Hideki

  Faculty Of Agriculture Yamaguchi University

• Morita Shigenori

  Graduate School Of Agricultural And Life Sciences The University Of Tokyo

• INANAGA Shinobu

  Arid Land Research Center, Tottori University

• An Ping

  Arid Land Research Center, Tottori University

• Inanaga Shinobu

  Arid Land Res. Center Tottori Univ.

• Tsuji Wataru

  Arid Land Research Center, Tottori University

• Sonobe Kaori

  Arid Land Research Center, Tottori University

• An Ping

  Arid Land Research Centre Tottori University

• An Ping

  Arid Land Research Center Tottori University

• Sonobe Kaori

  Arid Land Research Center Tottori University

• Tsuji Wataru

  Arid Land Research Center Tottori University

• Morita Shigenori

  Graduate School Of Agricultural And Life Sciences The Univ. Of Tokyo.

• ARAKI Hideki

  Faculty of Agriculture, Yamaguchi University

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