Effect of HCO3- on root growth and nutrient absorption of different rice genotypes

Abstract

Abstract: Solution culture experiments with Zn-inefficient cultivar(IR26)and the Zn-efficient cultivar(IR8192-31-2)were conducted to study the effect of HCO₃^- on the root growth and nutrient absorption of different rice cultivars.The results showed that HCO₃^- strongly inhibited the root growth of Zn-inefficient cultivar especially at low Zn concentration.In contrast,that of Zn-efficienct cultivar was slightly stimulated by HCO₃^- at low Zn concentration.HCO₃^- not only inhibited Zn absorption of Zn-inefficient cultivar,but also inhibited its absorption of Fe,Mn,Cu,implying that there was no specific inhibition of HCO₃^- on Zn absorption.These results demonstrated that the inhibition of root growth by HCO₃^- was likely to be the initial action of HCO₃^- in inducing Zn deficiency in lowland rice.With treatment of bicarbonate,Zn concentrations in upper and lower leaves of the Zn-efficient cultivar and their ratios were higher than those of the Zn-inefficient cultivar.The results showed that the Zn-efficient cultivar could transport more zinc from lower leaves to upper leaves,which might be one of mechanisms that the Zn-efficient cultivar adapted to zinc deficiency in calcareous soil.

Key words: Zn-inefficient rice cultivar, Zn-efficient rice cultivar, HCO₃^-, Root growth and nutrient absorption

CLC Number:

S311

XU Xiaoyan, YANG Xiaoe, YANG Yuai. Effect of HCO₃^- on root growth and nutrient absorption of different rice genotypes[J]. Chinese Journal of Applied Ecology, 2001, (4): 557-560.

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Effect of HCO₃^- on root growth and nutrient absorption of different rice genotypes

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