The effect of quince rootstocks and interstems on the mineral content of twelve pear cultivars
1994
Psarras, G.
The possible role of mineral content of leaf, bark and roots in graft incompatibility between two clonal quince rootstocks (East Malling A and Provence Quince BA29) and twelve pear cultivars was studied. For the incompatible cultivars "Williams", "A.Fetel" and "Highland", interstems of "B.Hardly", "Comice", "P.Crassane" and "G.Leclerc" were used. Leaf samples were taken from bearing and non bearing trees, whereas bark samples were taken only from non-bearing trees. Leaf samples of "Tsakoniki had high levels of Fe, whereas "Kontoula" had low Ca. "Comice" had the lowest levels of almost all elements. From the incompatible cultivars, "A.Fetel" had low levels of Mn and "Champion" of Fe; these two cultivars had also the lowest chlorophyll content. Leaves of "B.Hardly" were high in Mn. Interstems of "Comice", "P.Crassane" and "G.Leclerc" did not increase the leaf content of any element. However, interstems of "B.Hardly" increased the Mn levels. Our results indicate that "B.Hardly induces higher uptake of Mn when used as scion or interstem. Significant differences were found in the miner content of bark samples collected during winter from shoots, roots and above or below the graft union. However, the pattern change of the elements was similar to all combinations tested and was not affected by the degree of rootstock scion incompatibility.
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