The ‘A’ Genome of Arachis hypogaea L

抄録

An attempt was made to find out the possible donor of the ‘A’ genome in Arachis hypogaea. For this, the chromosome morphology at pachytene was studied in Arachis correntina (Burk) Krap. et Greg. (Unpub. PI 331194) a diploid member of section Arachis. A comparison was also made of chromosome associations at meiotic metaphase I, chiasma frequencies, meiotic abnormalities, pollen fertilities and agronomical features of triploid, tetraploid and hexaploid derivatives from the two crosses A. hypogaea×A. correntina and A. hypogaea×A. chacoense. Pachytene chromosome morphology of A. correntina conformed to the ‘A’ genome of A. hypogaea. The derivatives also did not differ from each other. The tetraploid derivatives were similar to those of A. hypogaea parent for the various characters studied, except for the fact that the derivatives had leaf spot and rust resistance incorporated into them from the wild species. It was concluded that A. correntina could also be a donor of the ‘A’ genome and that genomic differences between section Arachis diploid species with the exception of A. batizocoi are not much pronounced.