Ancestors of 80- and 78-chromosome Glycine tomentella Hayata (Leguminosae)

Publisher Website
Google Scholar
Abstract
The objective of this study was to determine the progenitors of 80- and 78-chromosome tomentellas of the subgenus Glycine. Wide geographical distribution, aggressive and vigorous growth habit, diploid-like meiosis in the accessions, and meiotic pairing in intraspecific and interspecific hybrids suggested that both cytotypes (2n = 80, 78) evolved through allo-polyploidization. Two synthetic amphidiploids were obtained by somatic chromosome doubling ((G. tomentella, 2n = 40, genome DD) × (G. canescens, 2n = 40, genome AA) = F1, (2n = 40, genome AD), which was treated with colchicine, giving 2n = 80, genome AADD; (G. tomentella, 2n = 38, genome EE) × (G. canescens, 2n = 40, genome AA) = F1, (2n = 39, genome AE), which was treated with colchicine, giving 2n = 78, genome AAEE). These amphidiploids, which exhibited gigas effect, diploid-like meiosis, and normal pollen and seed set, were hybridized with 80- and 78-chromosome tomentellas. On the basis of morphological characteristics and meiotic pairing in F1 plants, G. tomentella (2n = 40, DD) and G. canescens (2n = 40, AA) are concluded to be the ancestors of 80-chromosome tomentellas (AADD) from Queensland, Australia. One of the ancestors of 80-chromosome tomentellas from Northern Territory and Western Australia, Australia, and Papua New Guinea is G. canescens; the second progenitor species was not determined. In addition, it is apparent that both 40- and 38-chromosome tomentellas gave rise to 78-chromosome G. tomentella (DDEE).Key words: allopolyploidy, colchicine, genome, intraspecific and interspecific hybridization, polyploid complex.

This publication has 13 references indexed in Scilit: