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Hybrid vigor as indicated by early growth characteristics of populus deltoides populus nigra and populus euramericana


Hybrid vigor as indicated by early growth characteristics of populus deltoides populus nigra and populus euramericana



Canadian Journal of Botany 62(1): 1-8



ISSN/ISBN: 0008-4026

The early growth of 2 hybrid P. .times. euramericana (Dode) Guinier clones and a species clone each of P. deltoides Bartr. ex Marsh. and P. nigra L. in controlled environments was studied in terms of growth of organs, partitioning of dry weight among parts, and growth analysis parameters. The hybrid clones grew more vigorously compared with the species' clones with regard to most of the parameters measured. From 7 wk after planting onward, the hybrid clones had greater plant dry weight, leaf dry weight, leaf area, and root dry weight than did the species' clones. The hybrids developed a larger root system and greater leaf area per unit weight earlier than did the species' clones. The greater leaf area was associated with lower specific leaf area. At all times the hybrid clones had significantly greater relative growth rates which were associated with early differences in unit leaf rate and later differences in leaf area ratio among the clones.

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Accession: 005597173

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