HCO3-对不同基因型水稻根生长及养分吸收分配的影响

应用生态学报 ›› 2001, Vol. ›› Issue (4): 557-560.

HCO₃^-对不同基因型水稻根生长及养分吸收分配的影响

徐晓燕¹, 杨肖娥², 杨玉爱²

1. 中国科学技术大学经济技术学院烟草科学系, 合肥 230052;
2. 浙江大学环资学院, 杭州 310029

收稿日期:2000-03-06 修回日期:2000-09-04 出版日期:2001-07-25
通讯作者: 徐晓燕,女,1965年生,博士,副教授,主要从事土壤、植物营养与分子生物学研究,发表论文15篇.Tel:0551-3492126,E-mail:xuy@mail.hf.ah.cn
基金资助:
国家自然科学基金资助项目(39570416)

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

XU Xiaoyan¹, YANG Xiaoe², YANG Yuai²

1. Department of Tobacco Science, University of Science and Technology of China, Hefei 230052;
2. Zhejiang University, Hangzhou 310029

Received:2000-03-06 Revised:2000-09-04 Online:2001-07-25

摘要/Abstract

摘要： 采用营养液培养法,研究了缺Zn敏感(IR26)和耐性水稻品种(IR8192-31-2)根生长和养分吸收受HCO₃^-影响的差异.结果表明,HCO₃^-(20mmol·L^-1)严重抑制敏感品种根系生长,特别是在低Zn或缺Zn条件下,而对耐性品种影响很小,在低Zn水平下,对根系生长甚至有轻微的促进作用.HCO₃^-不仅抑制敏感品种对Zn的吸收和分配,而且也抑制对Cu、Mn和Fe的吸收,表明HCO₃^-对Zn的吸收无专性抑制作用,HCO₃^-抑制敏感品种根系生长可能是其诱发缺Zn的最初作用.NCO₃^-处理下,耐性品种上位叶和下位叶Zn浓度以及比率高于敏感品种,表明耐性品种将Zn从下位叶向上位叶转运的效率高,Zn在植物体内的转运能力可能是耐性品种适应石灰性土壤缺Zn的主要机制之一.

关键词: 缺Zn敏感水稻品种, 耐缺Zn水稻品种, 重碳酸氢根, 根生长及养分吸收

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

中图分类号:

S311

徐晓燕, 杨肖娥, 杨玉爱. HCO₃^-对不同基因型水稻根生长及养分吸收分配的影响[J]. 应用生态学报, 2001, (4): 557-560.

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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HCO₃^-对不同基因型水稻根生长及养分吸收分配的影响

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

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