J Integr Plant Biol. ›› 1981, Vol. 23 ›› Issue (6): -.

• Research Articles •    

The Effect of Natural Growth Inhibitors in Potato Tuber on Respiration

Liang Hou-kuo, Chen Hong-yi and Liao Ming-long   

Abstract: The effects of natural growth inhibitors in potato tuber periderm on respiration were studied. The following results are presented in this paper: 1. The respiratory rate of potato tuber slices increased by application of inhibitors at concentration suppressing the growth of wheat coleoptile sections. This fraction of respiration induced by inhibitors was insensitive to DNP. According to inhibiting ex- periments with iodoacetic acid, malonic acid and KCN, it seems that this induced respiration is mediated by the EMP-TCA pathway and the CN-sensitive electron transfer chain. 2. The effects of various growth regulators on respiration are different depending on whether they are used in single or in combination. When the endogenous inhibitors at Rf 0.4—0.8 plus IAA or GA were studied, the inhibitors induced respiration rise was partially reduced by IAA, but completely depressed by GA. It seems reasonable to consider that the manner and the site of action of various growth zegulators on, respiration are not same.

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