Iron deficiency responses in roots of kiwi
作者:
Giannina Vizzotto,
Ivica Matosevic,
Roberto Pinton,
Zeno Varanini,
Guglielmo Costa,
期刊:
Journal of Plant Nutrition
(Taylor Available online 1997)
卷期:
Volume 20,
issue 2-3
页码: 327-334
ISSN:0190-4167
年代: 1997
DOI:10.1080/01904169709365253
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Many dicotyledonous species respond to iron (Fe) deficiency by morphological and physiological changes at root level, which are usually defined as Strategy I. Particularly, these latter modifications include a higher acidification of the external medium and the induction of a high root Fe reductase activity. The aim of this work was to investigate the response of kiwi(Actinidia deliciosacv. Hayward) plants, which often exhibit Fe chlorosis in the field, to Fe deficiency.Actinidiakept for two weeks in nutrient solution without Fe showed visual deficiency symptoms (leaf chlorosis). Moreover, upon prolonged micronutrient shortage shoot, and to a lesser extent, root dry weight accumulation was greatly impaired. Roots of Fe‐deficientActinidiashowed an increased capacity of net proton extrusion and higher ferric ethylenediaminetetraacetate [Fe(III)EDTA] reductase activity as compared to plants grown in the presence of 10 μM Fe(III)EDTA. Localization of the increased acidification and reductase capacity by means of agar‐technique revealed that these activities are both present in the sub‐apical region of the roots. Re‐supply of Fe after two weeks partially reversed the tendency of the roots to acidify the nutrient solution and to reduce Fe(III)EDTA.
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