Evidence for long-term heterosis phenomenon in the Alnus incana x glutinosa F-1 hybrids
1999
Mejnartowicz, L.
This report gives the result of investigation carried out with hybrid progenies of the phenotypically negative dwarf Alnus incana tree, pollinated with a pollen mixture sampled From 12 plus trees of Alnus glutinosa. The experimentcovers growth rate. branching type, stem form and morphological character of leaves. Through twenty-eight years of studies the mean height and diameter growth of tested hybrid progenies A. incana x A. glutinosa were much better than those of A. glutinosa paternal population. At age 12 interspecific hybrids showed superior growth-rate over the paternal population on 90%. At age 28 hybrids surpassed the black alder paternal population by 22% in diameter. The trunks were straight with the vital twigs settled at an acute angle. Heterosis was also demonstrated in the bigger leaf size and more abundant production of leaf proteins. Flowering and seed production of hybrids was classified as poor.
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