Cepa Aggregatum Group Research Articles

Chromosomal locations of isocitrate dehydrogenase and phosphoglucoisomerase gene loci in shallot (Allium cepa L. Aggregatum group).

The chromosomal locations of isozyme gene loci encoding isocitrate dehy-drogenase (IDE) and phosphoglucoisomerase (PGI) were investigated in shallot (Allium cepa L. Aggregatum group). The alien monosomic addition lines of A. fistulosum L. with the extra chromosomes (1A, 2A, 5A, 6A, 8A and other unidentified chromosomes) from A. cepa Aggregatum group were used as plant materials. Both gene loci, Idh-1 and Pgi-1, were located on the chromosome 5A. The present study established two new isozyme markers for the chromosome 5A in addition to the six previously reported isozyme markers for the chromosomes 1A, 2A, 6A and 8A.

Chromosomal locations of five isozyme gene loci(Lap-1, Got-1, 6-Pgdh-2, Adh-1 and Gdh-1) in shallot(Allium cepa L. Aggregatum group).

The chromosomal locations of isozyme gene loci encoding leucine aminopeptidase (LAP), glutamate-oxaloacetate transaminase (GOT), 6-phosphogluconate dehydrogenase (6-PGDH), alcohol dehydrogenase (ADH) and glutamate dehydrogenase (GDH) were investigated in shallot (Allium cepa L. Aggregatum group). The alien monosomic addition lines of A. fistulosum L. with the extra chromosomes (1A, 2A, 6A, 8A and other unidentified chromosomes) from A. cepa Aggregatum group were used for plant materials. The results revealed that the five gene loci, Lap-1, Got-1, 6-Pgdh-2, Adh-1 and Gdh-1, were located on the chromosomes 1A, 2A, 2A, 6A and 8A, respectively.

Chromosomal locations of glutamate oxaloacetate transaminase gene loci in Japanese bunching onion(Allium fistulosum L.) and shallot(A.cepa L.Aggregatum group).

The chromosomal locations of glutamate oxaloacetate transaminase gene loci in Japanese bunching onion (Allium fistulosum L., 2n=2X= 16, FF) and shallot (A. cepa L. Aggregatum group, 2n=2X = l6, AA) were investigated using alien monosomic addition lines (2n=2X+1=17, FF+nA, AA+nF) and hypoallotriploid lines (2n=3X-1=23, AFF-nA, AAF-nF) between these two species. The gene locus Got-2 was located on the homoeologous sub-telocentric chromosomes, 6F in A. fistulosum and 6A in A. cepa Aggregatum group. The gene locus Got-1 was on the other chromosomes. The present results indicate that chromosomal locations of these gene loci, at least Got-2, were conservative both in A. fistulosum and A. cepa Aggregatum group during speciation and subsequent evolution.