DEVELOPMENT IN COWPEA (VIGNA-UNGUICULATA) .2. EFFECT OF TEMPERATURE AND SATURATION DEFICIT ON TIME TO FLOWERING IN PHOTOPERIOD-INSENSITIVE GENOTYPES

Authors
CRAUFURD PQ QI A ELLIS RH SUMMERFIELD RJ ROBERTS EH
Citation
Pq. Craufurd et al., DEVELOPMENT IN COWPEA (VIGNA-UNGUICULATA) .2. EFFECT OF TEMPERATURE AND SATURATION DEFICIT ON TIME TO FLOWERING IN PHOTOPERIOD-INSENSITIVE GENOTYPES, Experimental Agriculture, 32(1), 1996, pp. 13-28
Citations number
22
Categorie Soggetti
Agriculture
Journal title
Experimental Agriculture → ACNP
ISSN journal
00144797
Volume
32
Issue
1
Year of publication
1996
Pages
13 - 28
Database
ISI
SICI code
0014-4797(1996)32:1<13:DIC(.E>2.0.ZU;2-6
Abstract
Twenty-nine diverse genotypes of cowpea (Vigna unguiculata) were grown in approximately 30 photothermal environments in Nigeria and Niger, w ith mean temperatures ranging from 19 degrees to 30 degrees C, photope riods from 10 to 16 h d(-1) and saturation deficits from 0.5 to 3.1 kP a. Twelve of these genotypes were insensitive to photoperiod. The rime of flowering of these photoperiod-insensitive genotypes showed a simi lar response to temperature. Time to flowering was also delayed by mea n pre-flowering saturation deficits greater than 1.5 kPa. The implicat ions of these responses to temperature and saturation deficit for phen ological adaptation in West Africa are discussed.