Bicarbonate rather than high pH in growth medium induced Fe-deficiency chlorosis in dwarfing rootstock quince A (Cydonia oblonga Mill.) but did not impair Fe nutrition of vigorous rootstock Pyrus betulifolia

Frontiers in Plant Science

Plant Science

Futong Yu¹  Zhi Sun²  Haigang Li²  Fei Li²  Yanyan Zhao³  Mingde Sun⁴  Zhenxu Liang⁴  Songzhong Liu⁴  Yinglong Chen⁵  Zed Rengel⁶ 

[1] College of Resources and Environmental Sciences, China Agricultural University, Beijing, China;Inner Mongolia Key Laboratory of Soil Quality and Nutrient Resources, Key Laboratory of Agricultural Ecological Security and Green Development at Universities of Inner Mongolia Autonomous Region, Inner Mongolia Agricultural University, Hohhot, China;Key Laboratory of Agricultural Ecological Security and Green Development at Universities of Inner Mongolia Autonomous Region, Inner Mongolia Agricultural University, Hohhot, China;Inner Mongolia Key Laboratory of Soil Quality and Nutrient Resources, Key Laboratory of Agricultural Ecological Security and Green Development at Universities of Inner Mongolia Autonomous Region, Inner Mongolia Agricultural University, Hohhot, China;Key Laboratory of Agricultural Ecological Security and Green Development at Universities of Inner Mongolia Autonomous Region, Inner Mongolia Agricultural University, Hohhot, China;The UWA Institute of Agriculture, & School of Agriculture and Environment, The University of Western Australia, Perth, WA, Australia;Institute of Forestry & Pomology, Beijing Academy of Agriculture & Forestry Sciences, Beijing Engineering Research Center for Deciduous Fruit Trees, Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (North China), Ministry of Agriculture, Beijing, China;The UWA Institute of Agriculture, & School of Agriculture and Environment, The University of Western Australia, Perth, WA, Australia;The UWA Institute of Agriculture, & School of Agriculture and Environment, The University of Western Australia, Perth, WA, Australia;Institute for Adriatic Crops and Karst Reclamation, Split, Croatia;

关键词: Fe deficiency;    bicarbonate;    high pH;    pear rootstock;    quince A;    Pyrus betulifolia;   

DOI  :  10.3389/fpls.2023.1237327

 received in 2023-06-09, accepted in 2023-08-14,  发布年份 2023

来源: Frontiers

【 摘 要 】

IntroductionQuince A (Cydonia oblonga Mill.), a typical dwarfing rootstock in pear cultivation, is susceptible to iron (Fe) deficiency in calcareous soils. The aim of this study was to compare the strategies in Fe uptake and utilization in dwarfing rootstock quince A (low Fe efficiency) versus a typical vigorous rootstock Pyrus betulifolia (PB) with high Fe efficiency.MethodsQuince A and PB were grown in nutrient solution (pH 6.3) for 4 weeks followed by three pH treatments: pH6.3, pH8.3a (adjusted with hydroxide) and pH8.3b (adjusted with bicarbonate). The Fe uptake and utilization indicators of the rootstocks were assessed at the onset of chlorosis symptoms (after 58 days of treatments).Results and discussionIn contrast to PB, quince A exhibited Fe deficiency chlorosis under bicarbonate (pH8.3b). Bicarbonate stimulated the root proton secretion, inhibited root growth and ferric chelate reductase (FCR) activity in both PB and quince A, whereas high pH without bicarbonate (pH8.3a) stimulated only root proton release. Both species accumulated more Fe in roots under high pH treatments than under pH6.3, resulting in Fe sufficiency in leaves. Both high pH treatments increased the activity of leaf FCR in PB and quince A. However, extractable Fe(II) concentration in leaves was increased by high pH treatments in PB only. This study demonstrated that depressed Fe(III) reduction in leaves caused by bicarbonate rather than high pH explained Fe deficiency in quince A grown in bicarbonate-containing medium.

【 授权许可】

Unknown   
Copyright © 2023 Zhao, Chen, Liu, Li, Sun, Liang, Sun, Yu, Rengel and Li