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首页> 外文期刊>日本作物學會紀事 >Studies on Branching Habits in Crop Plants : 4. On the growth of tillering buds after enlargement of space by thinning in thick-sown rice seedlings.
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Studies on Branching Habits in Crop Plants : 4. On the growth of tillering buds after enlargement of space by thinning in thick-sown rice seedlings.

机译：作物植物分支习性研究：4。厚苗稻幼苗稀释后扩大空间后的分蘖芽的生长。

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摘要

This experiment was made for the purpose of studying the possibility of growth in tillering buds which have ceased to grow. Rice seeds were sown relatively thickly, i. e., one seed every 3 cm × 1.5 cm in 1959, and one seed every 3 cm × 1.5 cm or 6 cm × 3 cm in 1961. These rice seedlings were thinned alternatively so that the spaces among the seedlings were enlarged to 6 cm × 3 cm or to 12 cm × 6 cm. Thinning treatments were made at the seedling age 5, 6, 7 or 8 by means of clipping the seedlings with scissors. at the ground surface After that, the growth and the leaf formation of each tillering bud were observed at every seedling age. Moreover, the measurements of respiratory rates were made 2 days after thinning in 1961. During the two years of experiments, the tillering buds which grew surely after each age thinning were as follows: In 1959 (Fig. 2 and Table 3), the 2nd, 3rd, 4th, 5th and 6th tillering buds after the 5th age thinning, the 2nd, 4th, 5th and 6th ones after the 6th age thinning, the 6th, 7th and 8th ones after the 7th age thinning, and the 7th and 8th ones after the 8th age thinning; in 1961 (Fig. 3, Fig. 4 and Table 3), the 5th, 6th and 7th tillering buds after the 6th age thinning, and the 6th, 7th and 8th ones after the 7th and 8th age thinnings. The 2nd and 3rd buds grew after thinning of seedling age 5 or 6 in 1959, but did not grow after thinning of seedling age 6 in 1961. The difference between the results of two years' experiments is thought to be due to the facts that these buds were in the course of growth at seedling age 5 and 6 in 1959, although have ceased to grow at the same age in 1961. The differentiation of leaves on each tillering bud were observed at every seedling age with cross section (Table 1 and Fig. 5). In these observations the author could recognize the following facts; first, even in a bud which has ceased to grow, new leaves are being formed on the growing point though very slowly, second, leaf formation is accelerated by thinning not only in the tillering buds which grow after thinning (ex. the 6th bud in Fig. 5), but also in those which do not grow after thinning (ex. the 2nd and 4th ones in Fig. 5). As regards the respiratory rate, similarly, it was shown to be activated by thinning even in the buds which do not grow after thinning (Table 2). In a previous work, the author found that at the seedling age "n" in thick-sown rice seedlings, the "n"th and "n-1"th tillering buds are in the course of growth, the "n-3"th and lower ones have ceased to grow. In this experiment, the following facts were observed : If the spaces among seedlings are enlarged at seedling age "n" in the similar seedlings, the "n"th and "n-1"th buds grow surely and normally, the "n-3"th and lower ones do not grow, and the "n-2"th bud, which is in a critical stage, grow temporarily or very slightly with only a few exceptions. In those buds that do not grow, however, the formation of leaves are accelerated and the respiration activated. The main factors which inhibit the growth of these buds, in spite of activation of leaf formation and respiration, are going to be studied.
机译：该实验是为了研究不再生长的芽芽生长的可能性。米种子相对较厚，我播种。即，1959年每3厘米×1.5厘米的一粒，1961年每3厘米×1.5厘米或6cm×3cm×1.5厘米或6cm×3cm。这些米幼苗替代，使幼苗的空间扩大到6厘米×3厘米或12厘米×6厘米。通过用剪刀剪切幼苗，在幼苗5,6,7或8时进行稀疏处理。在地面之后，在每个幼苗时代观察到每个分蘖芽的生长和叶片形成。此外，在1961年减薄后2天进行呼吸率的测量。在两年的实验中，在每年变薄后肯定地生长的分蘖芽如下：1959年（图2和表3），第二次第3岁5岁稀薄后的第3岁，第2岁，第四，第四，第6和第6岁后的第6岁，第6岁以下后的第6岁，第7和第8岁后的第6岁，第7岁和第8和第8岁在第8岁稀疏之后;在1961年（图3，图4和表3），第6岁稀薄后的第五，第6和第7次分蘖芽，第7和第8岁以年龄稀薄后的第6个，第7和第8岁。在1959年的幼苗5或6岁或6岁的幼苗5或6岁稀薄后，苗木在1961年6月6日稀疏的情况下增长。两年的实验结果之间的差异被认为是由于这些事实芽在1959年幼苗5和6岁的幼苗赛中，尽管已经在1961年的同龄中停止增长。在每个幼苗年龄的横截面上观察到叶片上的叶子的分化（表1和图1 。5）。在这些观察中，提交人可以认识到以下事实;首先，即使在停止生长的芽中，也在生长点上形成新的叶子，虽然非常缓慢地，但不仅在稀疏后生长的分蘖芽（例如第6芽图。5），但也在减薄后不会生长的那些（例如图5中的第2位和第4位）。同样地，呼吸速率，类似地，即使在稀疏后不生长的芽中，也通过稀释而被激活（表2）。在以前的工作中，作者发现，在厚播种水稻幼苗的幼苗年龄“n”，“n”和“n-1”分蘖芽在生长过程中，“n-3”和较低的人已经停止生长。在这个实验中，观察到以下事实：如果幼苗中的空间在类似幼苗中的幼苗年龄“n”，则“n”和“n-1”芽肯定和正常，“n- 3“th和较低的人不会生长，并且在关键阶段的”n-2“芽，只有几例例外地暂时或非常略微生长。然而，在那些不生长的芽中，叶片的形成是加速和激活的呼吸。尽管叶片形成和呼吸活化，但抑制这些芽生长的主要因素将会研究。

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    《日本作物學會紀事》 |1965年第2期|共页
  • 作者

    Kiichi HANADA;

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  • 收录信息 美国《科学引文索引》(SCI);
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