00228423

open access

Version of Record

サツマイモ ノ カガク セイブン ニ オヨボス カリ エイヨウ ノ エイキョウ ノウゲイ カガク

English (英語)

神戸大学農学部研究報告

10(1)

103-106

神戸大学農学部

1971

2006-09-15

本文ファイルは、国立情報学研究所CiNiiより提供されたものです。

In order to prepare a profitable material for investigations into the effect of potassium nutrition on the respiration in roots, shoot end of sweet potato plants var. 'Kohkei-14', 25cm long and with 5 leaves, was grown in solution culture without aeration for 3 weeks at varying potassium application and N-source. Yield survey and analysis of several constituents (total-N, phosphorus, potassium, amino-N, and sugars) were made on various plant parts. The effect of potassium nutrition on the respiration (QO_2(F)) in 2cm segments of the root tip and the root base were examined by the standard Warburg manometric technique. Ammonia toxicity associated with an exclusion of aeration may have depressed the respiratory metabolism in roots. A K-depletion of medium lowered the K-levels in roots to 2/3 of the normal levels in the 2 weeks' culture and to 1/2 in the 3 weeks' culture. Such a K-deficiency grade in roots from the 3 weeks' culture exceeded a critical point of K-deficiency resulting in a higher respiration rate than its normal status. The results obtained suggest that root samples from a 2 weeks' culture under nitrate nutrition may be the desired material.

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