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ヨウ ブンセキ ノ ケンキュウ 8 スイトウ シュカン ヨウブ セッカンブ オヨビ ホブ ノ ハツイク ケイカ トウタイ カクブ ノ オオキサ カンブツジュウ カンブツ ブアイ オヨビ ヨウメンセキ ノ セイイク ニ トモナウ ヘンカ ト ヨウメンセキ オ アラワス シスウ ニツイテ

Studies on Leaf Analysis 8 : The Growth and Development of Leaf, Internode and Ear on the Main Stem of Rice Plant : Seasonal changes of size, dry weight and dry matter percentage of various parts of rice plant, and on the leaf size index

Japanese (日本語)

兵庫農科大學研究報告. 農学編

4(1)

44-52

兵庫農科大学

1959

2014-06-11

This experiment was carried out to make clear the growth and development of leaf, internode and ear on the main stem of rice plant, as the basic data of leaf analysis. Results obtained are summrized as follows : 1. Life duration of each leaf showed a tendency to increase gradually from the lower position to the higher position. (Fig. 1) 2. The length of leaf blade increased gradually as the position rose from the 2nd blade to the 14th blade, and it reached maximum at 14th blade, decreasing again at the 15,16th blades. (Fig. 2) 3. The width of leaf blade increased as the position rose up to the 12th blade, and the 13,14th blades decreased slightly, it increased again at higher position than the 14th blade. (Fig. 3) 4. The maximum leaf area was observed at the 14th blade, and the area of the 16th blade was nearly equal that of the 11th blade. (Fig. 5) 5. Elongation process of the internode are shown in Fig. 6,and the length of internode increased gradually as the position rose. 6. From the relation between the length of leaf blade (L), width of leaf blade (W) and measured leaf area (S), the authors found the rapid method of determination of leaf area, such as S'=(L×W)×0.7. (S' : calculated leaf area; 0.7 : leaf size index) (Table 1) 7. The dry weight of each leaf blade changed regularly according to the leaf position as shown in Fig. 12,and the maximum weight was reached at about one week after full elongation. 8. Sheath-weight changed in the similar tendency as that of the blade, but the sheath showed the remarkable decrease than the blade after the maximum weight was attained. Tnis decrease of dry weight correlated closely with starch translocation in sheath. (Fig. 13) 9. Total weight of blade and sheath per stem was largest at the time immediately before heading. On the other hand, the maximum total weight of internode was reached at about one week after heading. (Fig. 16) 10. From the above results and the previous reports, the authors conceived the predominant function of each leaf on the main stem as follows : the role of 8∿10th leaves is the tillering, 11∿13th leaves is the stem elongation and ear formation, and 14∿16th leaves is the ripening.

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