Abstract
Five cowpea cultivars ( Vigna unguiculata (L.) Walp) were grown in controlled environment growth cabinets under each of three fluorescent lamp types, either alone or supplemented with tungsten lamps. For comparison, the same cultivars were grown widely spaced in the field at Ibadan, Nigeria. Several morphological attributes were recorded at first flowering in both situations and, accordingly, photomorphogenetic effects of lamp type were assessed. Providing the correct lamp type is used, plants of cv. TVu 4552 can be grown under artificial light in growth cabinets and closely resemble those grown in the field in the tropics in terms of reproductive ontogeny and overall morphology — stem elongation, branch production and leaf expansion.
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