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Heterosis for symbiotic nitrogen fixation inPhaseolusinterspecific hybrids

✍ Scribed by Monika M. Lülsdorf; F. Brian Holl

Publisher: Springer
Year: 1992
Tongue: English
Weight: 315 KB
Volume: 59
Category: Article
ISSN: 0014-2336
DOI: 10.1007/bf00041270

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✦ Synopsis

Interspecific hybrids of Phaseolus vulgaris and Phaseolus acutifolius or Phaseolus filiformis have been evaluated for evidence of heterosis for symbiotic nitrogen fixation activity. Hybrids showing composite leghemoglobin profiles were selected for comparison. Rooted cuttings from hybrids and their respective parents were used to estimate nitrogen fixation (acetylene reduction) rates and to determine nitrogen accumulation during the growth period. Some hybrids of Phasolus vulgaris x Phaseolus acutifolius and Phaseolus vulgaris x Phaseolus filiformis had significantly (P < 0.01) higher nitrogen fixation rates and in the latter case, accumulated more total nitrogen, than either parent. The interspecific hybrids also showed more complex leghemoglobin profiles than either parent.

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