Iron and proteins mobilization in Vitis Vinifera cultivars variously tolerant to iron chlorosis

摘要

In dependence of their genotype tolerant rootstocks do not evidence iron deficiency symptoms of inter-vein chlorosis even in highly calcareous soils (Tagliavini et al., 1995). It can be presumed that such plants have an enzymatic redox equipment depending on the Fe~(2+)/Fe~(3+) ratio (Nenova and Stoyanov, 1995), such that makes the microelement in its active form available to the plant. Tolerant varieties can mobilize iron by determining a lower pH in the soil at root level, thanks to their ability to emit H~+ and/or organic acids; in the latter case, iron is absorbed and transferred as a complex (Gessa et al.,1997). The present research was conducted with the aim of assessing the various rates of iron absorption by sensitive cultivars when graftedon a tolerant rootstock in an iron-deficient soil.