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PJB-1975-6
CYCOLOGICAL AND MORPHOLOGICAL STUDIES ON ALLOTETRAPLOIDS OF (G.ARBPREUM X G. STOCKSII) AND (G. STOCKSII X G. ARBORETUM)
Abstract
Allo-tetraploids of (G.arbpreum x G. stocksii) (A) and (G. stocksii x G. arboretum) (B) were obtained by colchicine treatments. Cylogical studies of the allotetraploids revealed 2.2 I, 24.6 II and 0.21 III with 88.35 pollen stainability percentage in (a) and 6/7 I, 20.6 II , 1.1 III AND 0.2 IV with 83.7 pollen stainability percentage in (B). morphological studies were also undertaken and comparing to diploid hybrids the allotetraploids were luxuritant in growth , resistant to pest and drought with increased pollen stainability and fertility ( fruit setting), indicating complete sterility of the diploid hybrids which was overcome by colchicine treatments.
