81005940

open access

Version of Record

ヨウ ブンセキ ノ ケンキュウ 1 スイトウ ニオケル タンスイカブツ ノ ジキテキ ヘンカ

Studies on Leaf Analysis 1. Seasonal variation of carbohydrates in rice plants

Japanese (日本語)

兵庫農科大學研究報告. 農学編

1(1)

5-8

兵庫農科大学

1953-12

2014-05-12

Carbohydrates, that is, sucrose, reducing sugar, and starch in leaf blade, leaf sheath, and top internode of rice plants were determined by photoelectric colorimeter by field experiment grown on varied fertilizer treatments. In complete plot, as normal growth was observed, sucrose content in dry leaf blade ranged from about 1 to 5%, gradually increasing as growth proceeds. At flowering stage, temporary decrease was observed, but in leaf sheath it was no evidence. We assume that at flowering stage ear demands much carbohydrates, so that sucrose are transported from leaf blade to ear. Reducing sugar content in leaf blade and leaf sheath ranged from 0.1∿1%. It is appeared that in leaf sheath maximum value was observed tillering and flowering stage. Starch was scarecely observed in leaf blade, but in leaf sheath contained remarkably, for example in complete plot 15%, at the stage between vegetative and reproductive phase-probably in the ear bud formation stage. This is a notable physiological function of rice plants. On the difference by varied fertilizer treatments, especially in respect to starch content in leaf sheath, NP or N plots reduced starch content, but K plot increased. We consider that K element indicates the rate photosynthesis. For the nutritional diagnosis of rice plants, we propose that starch content in leaf sheath at suitable stage is important index.

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