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Seedling physiology of 3 radiata pine pinus radiata families with parents of contrasting growth



Seedling physiology of 3 radiata pine pinus radiata families with parents of contrasting growth



Australian Forest Research 11(1): 13-22



Seedlings from 3 full-sib families of radiata pine (P. radiata D. Don), whose parents had high, medium or low general combining abilities for growth in stem volume in the field, were compared in 2 parallel experiments in the glasshouse, involving different nutrient regimes of either N or P. Plants were harvested 240 days after germination. Characters measured were as follows: height, diameter and dry weight of stem, dry weight of needles, length, diameter and dry weight of roots, length and frequency of occurrence of fascicles, number of needles per fascicle, fascicle index and uptake and distribution of N and P. Fascicle characters were adjusted to a constant shoot dry weight to remove the confounding influence of correlations with plant size. There was agreement between experiments in relative family performance for shoot, root and fascicle characters, although family differences were accentuated by N. The family with the highest expected potential for growth in the field also had the largest seedlings, but differences in seedling size between the other families were small. There was a positive association between family means for fascicle index and subsequent growth. Families did not differ in their ability to absorb N or P, but differed markedly in their efficiency of N utilization for growth, particularly stem growth.

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Accession: 006379099

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