Cytological investigations in some important tree species of Rajasthan VI. Radiation induced chromosome aberrations in Anogeissus pendula and A. latifolia

摘要

Irradiation of air-dried seeds of Anogeissus pendula and A. latifolia, the two multipurpose hard wood trees, produces various categories of chromosome aberrations in the root tips. Both chromosome and chromatid types of aberrations were observed in different cells and at times even with in the same cell. A high degree of polymorphism was exhibited by the resultant chromosomes after irradiation. The observations clearly showed distinct variations with respect to percentage values of abnormal cells; altered chromosome; chromosome-interchanges; chromosomeintrachanges; chromatid-intrachanges and unclassified types. The efficacy of the ionizing radiations in inducing various categories of chromosome aberrations and their possible role in genetic improvement through mutation breeding has been discussed in detail.