Identification of suitable seed regeneration sites for photoperiod-sensitive cowpea germplasm

To determine an appropriate location to regenerate photoperiod-sensitive co wpea [Vigna unguiculata (L.) Walp.], seed production and virus contaminatio n data were measured at Isabela, PR, St. Croix, VI, and Griffin, GA for six photoperiod-sensitive cowpea accessions. The results indicate that Isabela was best suited for seed regeneration of photoperiod-sensitive cowpea. See d production at Isabela was equal to or greater than that at either of the other two locations for these accessions. Virus infection of plants and of seeds was high at Griffin. However, little virus infection occurred at Isab ela and at St. Croix. The systematic approach used in these tests can be us ed as a model for curators in the National Plant Germplasm System and other s to determine the best environment in which to regenerate germplasm.