馬鈴薯近縁種における種の分化に関する研究。(第 6 報) Solanum longipcdicellatum × S. chacocnse の染色体行動と両親ゲノムの親和性に対するその意義

概要

論文の詳細を見る
In this paper, the meiotic behavior of an amphiploid plant with 72 somatic chromosomes, induced from S. longipedicellatum × S. chacoense, is described and its significance to the genomic affinity between the parent species is discussed. This plant shows such unexpectedly high multivalent frequency as is indicated as three quadrivalents plus three trivalents in a mean number per cell at first metaphase. The chromosome behavior during the subsequent meiotic course are considerably irregular, showing various abnormarities such as laggards at first and second anaphases, unbalanced plates at second metaphase, micronuclei in the sporads and pollen abortion. From considerations on these behaviors, a suggestion is given as follows : 1) the genome of S. chacoense is completely homologous with either of the two genomes of S. longipedicellatum, 2) thus, the genome formulae of LLCCCC for the amphiploid plant and LCC for both the triploid F_1 hybrids from crossing S. longipedicellatum with S. chacoense and S. schickii respectively are proposed anew.
神戸大学の論文