HYBRIDIZATION IN ACACIA N1LOTICA COMPLEX IN INDO-PAKISTAN SUBCONTINENT: CYTOLOGICAL EVIDENCE

摘要

Acacia nilotica complex comprises 9 subspecies of which 5 occur in Pakistan. Hybridization among subspecies is reported in some previous works on the basis of morphological and chemical data. The present work provides the first cytological evidence (disturbed meiosis) for hybridization between subsp. indica (Benth.) Brenan and subsp. hemispherica Ali & Faruqi. The frequent abnormalities found in pollen mother cells meiosis of putative hybrids were pairing disturbance and precocity at metaphase-I; and lagging chromosomes at anaphase-I.