Cytomorphological study in the interspecific hybrid Helianthus annuus L. x Helianthus argophyllus T. & G.
1999
Manjula, T. | Seetharam, A. | Seenappa, K. (GKVK, Bangalore (India). University of Agricultural Sciences)
An investigation was undertaken to study the cytomorphology of the interspecific hybrid Helianthus annuus var. Morden x Helianthus argophyllus along with the parents. The hybrid showed considerable vigour for plant height and stem girth. The hybrid was intermediate for seed size and test weight and exhibited reduced pollen and seed fertility. The chromosome pairing was normal in the parents while one chain or ring quadrivalent was observed in the hybrid in most of the meiotic cells scored in diakinesis / metaphase 1, suggesting that the species Helianthus annuus and Helianthus argophyllus differ by one reciprocal translocation. The mean chiasmata frequency in the hybrid was 20.94 per cell and 1.22 per bivalent, while for Helianthus annuus and Helianthus argophyllus the values were 22.76, 22.16 per cell and 1.33, 1.33 per bivalent, respectively.
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