Arun KUMAR, S. Ramo RAO, N. S. SHEKHAWAT

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

Çok özellikli sert ağaçlar olan Anogeissus pendula ve A. latifolia’nın havada kurutulmuş tohumlarının ışınlanması sonucunda kök uçlarında kromozom aberasyonları meydana gelmektedir. Hem kromozom hem de kromatid tiplerinde meydana gelen bu aberasyonlar, değişik hücrelerde veya aynı zamanda aynı hücrede gözlenebilmektedir. Yüksek derecede polimorfizmlerin ışınlama sonucunda meydana geldiği saptanmıştır. Gözlemler sonucunda, değişik oranlarda anormal hücre oluşumları, aynı kromozomda ya da farklı kromozomlar arasında parça değişiklikleri, kardeş kromatid değişimleri ve sınıflandırılamayan anormallikler saptanmıştır. İyonlaştırıcı radyasyonun etkisi ile, değişik kromozom aberasyonlarının meydana gelmesi ve bunun ıslah mutasyonu açısından muhtemel rolü detaylı bir şekilde tartışılmıştır.

Rajastan IV için bazı önemli ağaç türlerinde sitolojik araştırmalar: Anogeissus pendula ve A. latifolia' da radyasyonunun oluşturduğu kromozom aberasyonları

Irradiation of air-dried seeds of Anogeissus pendulaand 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.

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