Manganese (Mn) toxicity in plants is often not a clearly identifiable disorder and it can interfere with the absorption, translocation and utilization of other elements such as Ca, Mg, Fe and P. Soil conditions, management factors and the use of different genotypes of rootstock can determine the degree of Mn toxicity and of interaction with other elements in the orchard. Five plants of the cultivar ‘Big Top’ grafted onto itself, onto plum rootstock ‘Mr.S.2/5’ and onto hybrid peach x almond rootstock ‘GF677’ were grown in 25-liter containers under three treatments, 0%, 20%, 30% concentration of total lime, obtained by mixing powdered CaCO3 to a sandy soil. Plants were fertilized with manure and a solid fertilizer in early spring and irrigated in summer periodically with water rich in manganese. After just 28 days, active lime caused a decrease of chlorophyll SPAD index especially in plants grafted on itself, while those grafted on the tolerant ‘GF677’ rootstock behaved better than those grafted on ‘Mr.S.2/5’. From June to September, irrigation caused increases in soil Mn concentration and Mn concentration in control plants. This caused first a serious defoliation in BigTop/BigTop plants and then a re-greening of cultivar grafted onto ‘Mr.S.2/5’ and ‘GF677’, probably due to the interaction between iron and manganese at high pH. In particular the 20% CaCO3 addition to the soil preserved the plants of cultivar grafted onto ‘Mr.S.2/5’ from Mn toxicity, as shown by their high chlorophyll content and growth and lower Mn leaf concentrations. Plants grafted onto ‘GF677’ rootstock showed the best behaviour under 30% CaCO3 treatment associated to higher Fe(III)-reducing capacity and photosynthetic activity. Rootstocks and soil conditions (lime and waterlogging) influenced mineral status and growth of the peach cultivar ‘BigTop’, particularly by interacting together and modifying Fe-Mn availability.
|Autori:||CINELLI F; TAMANTINI I; IACONA C|
|Titolo:||Nutritional (Fe-Mn) interactions in 'Big Top' peach plants as influenced by rootstock and by soil CaCO3 concentration|
|Anno del prodotto:||2004|
|Digital Object Identifier (DOI):||10.1080/00380768.2004.10408580|
|Appare nelle tipologie:||1.1 Articolo in rivista|