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首页> 外文期刊>日本作物學會紀事 >Analysis of Developmental Factors Determining Yield and Its Application to Yield Prediction and Culture Improvement of Lowland Rice : L III. Developmental differences of young panicles in different maturing rice-varieties as affected by the time of cultivation and a method for identifying the developmental stages
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Analysis of Developmental Factors Determining Yield and Its Application to Yield Prediction and Culture Improvement of Lowland Rice : L III. Developmental differences of young panicles in different maturing rice-varieties as affected by the time of cultivation and a method for identifying the developmental stages

机译：确定产量的发育因子分析及其应用于产量预测和培养文化改善低地大米：L I​​II。培养时不同成熟水稻品种的青少年的发育差异及鉴定发展阶段的方法

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Further experiments were conducted with a view of clarifyillg the developmental differences of young panicles in different maturing varieties as affected by the time of cultivation and of establishing a method for identifying the developmental stages which can hold true in any circumstances. 1) Effects of early cultivation on hastening the time of first bract differentiation (which is the initiation of ear-primordium formation) are more remarkable in early varieties than in late varieties. Therefore, the larger varietal differences are found in the date of initiation of ear-primordia when rice-plants are transplanted the earlier. 2) The number of days required from the time of transplanting to the stage of the first bract differentiation as well as that required from the first bract differentiation to the heading are small in early varieties and large in late varieties, and in any variety, moreover, both the number of days are the larger in the earlier cultivation. From this fact it is confirmed that the number of days required from the initiation of ear-primordium formation to the heading, which has been hitherto considered to be nearly constant in general, varies considerably with the variety and cultiVation time. And it has been also made clear that the differences in number of days required from the initiation of ear-primordia to the heading due to different varieties and different cultivation times can be ascribed to the differences in the total number of leaves emerging on the main culm and the varietal differences in the photoperiodic and thermic sensitivities of the plant. 3) As the results of examinig the method for identifying each developmental stage which should hold true in any circumstances, it has been proved that a corrected "foliar age index"can satisfactorily be used. (c.f. Bull. Natio. Inst. Agr. Sci. Series A 5) The corrected "foliar age index"(Y) is calculated by the following formula, taking 16 in the total number of leaves on the main culm as a standard. Y=y+(1OO-y)×16-χ/10 Where y is indicating the "foliar age index"at a given stage, χis the total number of leaves on the main culm of a given variety used, which is fairly constant as a varietal character under a given cultural condition. By the way, "the foliar age index"is represented by the percentage ratio of the number of leaves which have actually emerged on the main culm by a given time to the total number of leaves to be expected by the time of heading on the main culm
机译：通过对不同成熟品种的年轻圆锥的发育差异进行了进一步的实验，这些植入在不同成熟品种中的培养时间和建立在任何情况下识别可以保持真实的发展阶段的方法。 1）早期培养对初始混凝的时间（即耳 - 原始形成的启动）在早期品种中更加出色，而不是晚期品种。因此，当米 - 植物移植之前，在耳后的开始时发现了较大的变异差异。 2）从初始苞片分化的阶段进行移植时所需的天数以及从最初的初始品种和大型品种的较大的第一次Bract差异，以及在任何品种的情况下都很小，而且，较早的培养中的天数都是较大的。从这个事实中证实，迄今为止被认为是几乎恒定的耳 - 原始形成所需的天数是几乎恒定的，随着品种和培养时间而变化。还有清楚的是，由于不同的品种和不同的种植时间，从耳初前开始的日子所需的天数的差异可以归因于主秆出现的叶片总数的差异和植物光周期和热敏敏感性的变异差异。 3）作为审查结果识别每个发育阶段的方法，在任何情况下都必须保持真实，有人旨在令人满意地使用纠正的“叶面年龄指数”。 （C.F. Bull。Natio。Inst。Agr.SCI。系列A 5）通过以下公式计算校正的“叶面年龄指数”（Y），在主秆上的叶片总数中作为标准进行16个。 Y = Y +（1OO-Y）×16-χ/ 10，其中Y表明在给定阶段的“叶面年龄指数”，χ在给定品种的主要秆上的叶片总数，这相当恒定在给定的文化条件下的一种品种特征。顺便说一下，“叶面年龄指数”由叶片的数量的百分比表示，这些叶片在主要的秆上实际出现在主要的时间上，以便在主要的叶子上的总叶子上进行预期c

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