Effect of a rootstock on apple growth and IAA, ABA and calcium concentration in leaves
2000
Wlosek-Stangret, C.R. (Warsaw Agricultural University, Warsaw (Poland)) | Rakowski, K.J. | Jadczuk, E.
Concentration of IAA, ABA and calcium have been determined in shoot leaves of Jonagold apple trees grafted on five rootstocks. The leaves of semi-vigorous trees growing on M.26 and P14 had lower levels of free ABA and calcium than those from dwarf trees on P22, M.9-751 and P60. Free and conjugated IAA concentrations were similar in the foliage of all trees tested with the exception of those on P60, where the content of conjugated hormone was higher as compared to other combinations. Apple trees grafted on semi-vigorous M.26 and P14 terminated growth later than those on dwarfing rootstocks. These results are discussed in terms of a possible involvement of hormoness and calcium in the rootstock effect on tree vigour
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