Studies on the Grain Productivity in Rice Tillers of Different Order and Position on the Main Stem

水稻主茎上不同分蘖顺序和位置的籽粒生产力研究

• 批准号: 03660015
• 负责人: YAMAMOTO Yoshinori
• 金额: $ 1.47万
• 依托单位: Kochi University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03660015/
• 关键词: Rice; Plant type; Removal of tiller; Panicle weight; Cropping season; Order of tiller; Tillering position on the main stem; 1次分げつの抑制; 1次分げつ出現時期; 主稈の節位別・次位別精籾収量; 精籾収量; 収量構成要素

About 4.5 leaf-aged rice seedlings of different ecotype and plant type cultivars with almost same heading time were transplanted in ca. 1/1000a pot with one seedling per hill. And primary tillers developed from base to the 5th(T1), 8th(T2) or 11th(T3) node on the main stem were removed to clarify the effects of tillering position on the grain productivity in rice tillers of different order and position on the main stem. The results were summarized as follows:1.First tillering date of T1,T2 and T3-plot corresponded to the beginning active and final to maximum tillering stage of non-treated(C) plot, respectively.2.The lower the nodal position on the main stem was, the higher the panicle weight in all plots, mainly due to the difference of panicle number. Both of the total panicle and average a panicle weight at the same position on the main stem was higher in order of T3>T2>T1>C-plot. And also the average of a panicle weight was higher in tillering order and marked decrease of a panicle weight by ascending the nodal position was found in higher order tillers.3.Although the number of maximum tillers and panicles were lower in order of T1<T2<T3<C-plot, the average of a panicle weight showed reverse response to the removal of lower tillers. But great varietal difference was found in the increment of a panicle weight by the treatment, that is, increasing rate was higher in panicle number type than panicle weight type cultivars. Consequently, panicle weight per hill, namely yield, of the former type cultivars did not change or rather increase, but decrease in case of the latter type cultivars by the treatment. And this yield in-crease was closely related to the period of vegetative growth, that is, days from tiller appearance to heading, so the highest effect was obtained in the early planting in normal season culture.

大约 4.5 株不同生态型和株型品种、抽穗期几乎相同的叶龄水稻秧苗被移栽于约 100 株中。 1/1000a 盆，每山一苗。并剔除从基部至主茎第5节(T1)、第8节(T2)或第11节(T3)的初生分蘖,以明确分蘖位置对水稻不同序次和不同位置分蘖产量的影响。主干。结果如下：1.T1、T2、T3小区的首次分蘖日期分别对应于未处理(C)小区的开始活跃期和最终最大分蘖期。2.节点位置越低，主茎越多，各小区的穗重越高，主要是由于穗数的差异。主茎同一位置的总穗重和平均穗重均较高，顺序为T3>T2>T1>C图。分蘖序中穗重均值较高,高序分蘖中穗重随节位升高而明显下降。 3.虽然最大分蘖数和穗数按T1<T2的顺序较低。 <T3<C-图，平均穗重显示出对去除下分蘖的相反反应。但处理后穗重增加量存在较大品种差异，即穗数型品种的增加率高于穗重型品种。因此，通过处理，前一类型品种的每山穗重（即产量）没有改变或者反而增加，但在后一类型品种的情况下却减少。而这种增产效果与营养生长期，即从分蘖出现到抽穗的天数密切相关，因此在正常季节栽培中，在播种初期获得的效果最高。