Growth and Nitrogen Fixation of Phaseolus vulgaris L. at Two Irradiances 1. Growth
1978; Oxford University Press; Volume: 42; Issue: 2 Linguagem: Inglês
10.1093/oxfordjournals.aob.a085472
ISSN1095-8290
AutoresL. D. Antoniw, Janet I. Sprent,
Tópico(s)Plant pathogens and resistance mechanisms
ResumoPlants of Phaseolus vulgaris grown at 7 and 28 W m−2 showed no differences in rate of development of leaves or flowers. At 7 W m-Z plants had longer internodes, more succulent stems and leaves, higher ratios of shoot:root and greater leaf areas that those at 28 W m−2. These differences were established prior to detectable differences in photosynthesis and could partly be attributed to an increased proportion of far-red light. Although the final d. wt, carbon content, and fruit yield were higher at 28 W m−2, plants at 7 W m−2 apparently had similar relative growth rates and greater photosynthetic efficiency. Dry weight differences are most easily interpreted as resulting from the establishment of an earlier net carbon gain at 28 W m−2 than at 7 W m−2.
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