Interspecific Crosses Among Ipomoea lacunosa, I. ramoni, I. trichocarpa, and I. triloba

Abstract

Chromosome-pairing at metaphase I in pollen mother cells of interspecific hybrids among Ipomoea lacunosa L., I. ramoni Choisy, I. trichocarpa Ell., and I. triloba L. was as good as that of the parental species, indicating a common genome for all 4 species. It is proposed that this genome be labeled "A." Some I. trichocarpa plants were observed to be perennial. On the basis of this observation and of other characters which are similar in the 4 species studied and in the sweet potato (I. batatas [L.] Lam.) it is suspected that genome A is one of the 3 genomes represented in the sweet potato.