Project/Area Number |
61560021
|
Research Category |
Grant-in-Aid for General Scientific Research (C)
|
Allocation Type | Single-year Grants |
Research Field |
作物
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Research Institution | Fukui Prefectural College |
Principal Investigator |
MIYASAKA Akira Fukui Prefectural College, Department of Agriculture, 農学科, 教授 (90174151)
|
Co-Investigator(Kenkyū-buntansha) |
YOSHIKAWA Yoshikazu Fukui Prefectural College, Department of Agriculture, 農学科, 助手 (10200966)
|
Project Period (FY) |
1986 – 1988
|
Project Status |
Completed (Fiscal Year 1988)
|
Budget Amount *help |
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1988: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1987: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1986: ¥900,000 (Direct Cost: ¥900,000)
|
Keywords | 水稲の根 / うわ根 |
Research Abstract |
1) The characteristics of rice roots grown in the high yielding field. (a) The high yield of rice was clarified to be attributable to vertically elongated roots having rich amount, extended depth, and superior physical strength. This physical strength of the root showed a close relationship between its oxdative capacity. (b) Rich amount of superficial roots was also necessary to increase the yield. 2) The role of vertically elongated roots in the rice plant growth.The development of vertically elongated roots produced the increase in the lodging resistance. This fact was demonstrated by the cutting off treatments of roots operated in different growth stages. 3) The role of the superficial roots. The satisfactory ripening of the rice grain was indebted to the development of the superficial roots. The extract of superficial roots had promoted the translocation of photosynthate for grains. This knowlege was brought by the newly established method for translocation capacity of photo-synthates by means of killing sieve tubes in the rachises. 4) Effect of drainage on the development of vertically elongated roots and of superficial roots. (a) The continued drainage for 10 days from 40 days before the heading date facilitated the de-velopment of the vertically elonated roots. (b) The intermittent drainage during the ripening stage helped the growth of the superficial roots. 5) The role of lower leaves of the rice population in the activity of roots. By shearing treatment of the leaf blades situated in the lower parts of rice population, the support by the lower leaves to the activity of roots were recognized both in the booting stage and in the ripening stage. The development of vertically elongated roots showed a certain relationship with the activity of lower leaves in the booting stage, and that of superficial roots did with the vitality of lower leaves in the ripening stage.
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