Investigations on some physiological parameters involved in chlorosis occurrence in different grapevine rootstocks and a <i>Vitis vinifera</i> cultivar
Abstract1-year-old grapevine cuttings were grown in pots in order to test, during the growing period, the changes of some leaf compounds related to chlorosis occurrence (chlorophylls a, b and total chlorophyll, Fe++ , macronutrients and trace elements).
The genotypes tested were three rootstocks showing an increasing degree of chlorosis resistance (Vitis riparia x V. rupestris 101-14, V. berlandieri x V. riparia SO 4, V. berlandieri x V. rupestris 140 Ru) and a V. vinifera variety (Chardonnay), each of them grown in both a calcareous and a non-calcareous soil.
At the end of the growing period, the whole cuttings were analysed to test the macronutrients and trace elements content of the dry matter.
The most important findings are
- During the growing period, the chlorophyll and leaf Fe++ content first increases and then decreases.
- The rootstock most susceptible to chlorosis (101-14) shows in the calcareous soil the highest Fe and total leaf chlorophyll content, while the most resistant one (140 Ru) has the lowest values. Therefore, the analysis of such parameters is not a suitable tool to screen rootstocks for chlorosis resistance.
- Suitable tools to judge the resistance/susceptibility to lime-induced chlorosis in ungrafted rootstocks grown on calcareous soils are: a) the dry matter production at the end of the annual growing cycle; b) the 'iron efficiency ratio' (g dry matter/mg iron) in the shoot at the end of the annual growing period.
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