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首页> 外文期刊>日本作物學會紀事 >Prevention of Lodging of Rice Plants under Direct Sowing Culture on Well-Drained Paddy Field : II. Transition of the characters related to lodging resistance after the heading
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Prevention of Lodging of Rice Plants under Direct Sowing Culture on Well-Drained Paddy Field : II. Transition of the characters related to lodging resistance after the heading

机译：在排水良好的稻田下直接播种培养下水稻植物的预防：II。标题后的抗议抵抗相关的角色的转变

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The varietal differences and the interrelationships in transition of the characters related to lodging resistance after the heading were examined in direct sowing on well-drained paddy field. Four varieties differing in lodging resistance (i.e. Koshihikari, Yamakogane, No^-rin 25 and Kanto^- 90) were grown at two seeding densities. On the other hand, the effects of nitrogen top-dressing at full heading stage on lodging resistance were examined. 1. The decrease of lodging resistance after heading could bc attributed to the decrease in breaking strength and to the raise of the centroid height of the culm. 2. The decrease in the breaking strength after the heading had closer relationship to the decrease in the strength of leaf sheath than that of culm. 3. In the short-culmed variety, the contribution rate of leaf sheath to the breaking strength amounted to about 50% and this value maintained during about 30 days after the heading. However, in the long-culmed variety, thc rate was in the range of 30% to 40% and in lodging susceptible variety 'Koshihikari', the rate decreased rapidly after the heading. 4. The relative amount of starch in the breaking internode (the lowest internode over 6 cm long) decreased rapidly after the heading in thc lodging susceptible variety. Positive correlation coefficient was found between the amount of starch in the culm and the number of living leaf sheath wrapping the internode. 5. After heading, the number of living leaf and leaf sheath in the long-culmed variety were much the same to those in the short-culmed variety. However, the breaking internode of the long-culmed variety was one internode lower than that of the short-culmed variety, therefore, both the contribution rate of leaf sheath to the breaking strength and the starch amount of the culm in the long-culmed variety were less than those in the short-culmed variety. 6. By the top-dressing of nitrogen at full heading stage, the leaves and leaf sheathes of the lower internode were made alive longer. Consequently, it is considered that this treatment showed positive effect to lodging resistance through thc maintenance of breaking strength.
机译：在排水良好的稻田直接播种后，研究了与沟渠后抗性抗性相关性的字符转变的变异差异和相互关系。在两种播种密度下生长了四种多种植入抗性（即Koshihikari，Yamakogane，No ^ -Rin 25和Kanto ^ - 90）。另一方面，研究了氮顶敷在全场阶段对耐植物抗性的影响。 1.转向后的耐腐蚀性降低可以归因于突破强度的降低和秆的质心高度的升高。 2.突破后的断裂强度的降低与叶鞘的强度的关系更接近而不是秆的强度。 3.在短型多样性中，叶子护套对断裂强度的贡献率为约50％，并且在标题后约30天内保持该值。然而，在长达经过的多样性中，THC速率在30％至40％的范围内，并且在植入易感品种“Koshihikari”中，速率在标题后迅速下降。 4.在THC易感易感品种中，断裂节电极点中的淀粉（超过6厘米6厘米的最低节）迅速下降。阳性相关系数在秆中的淀粉量和包裹节间的活叶鞘的数量之间存在。 5.标题后，长达品种中的长达品种中的活叶和叶子鞘的数量与那些相同。然而，长达多样性的断裂节电器是低于短CULMED品种的节间，因此，叶鞘的贡献率均为叶片强度和长达多样化的杉木的淀粉量低于短被繁殖的品种。 6.通过在完全标题阶段的氮气上的顶部敷料，较低的间叶片和叶片护套较长。因此，认为该处理对通过维持断裂强度的耐腐蚀性的积极作用。

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