Study of Some Characteristics Related to the Sexual Reproduction in Autotetraploid Vicia narbonensis

Hassen Hamadi and El Bok Safia

Journal of Agricultural Science, 2011, vol. 3, issue 1, 153

Abstract: Some parameters such as frequency of pod formation, average number of seeds per pod and percentage of emptypods were used to evaluate the variation of fertility in autotetraploid Vicia narbonensis. The results showed thatthe autotetraploid and diploid parents had the same number of ova per gynaecium. However, the tetraploidseedling produced fewer seeds per pod and per seedling than their corresponding diploids; the poor fertilizationof many ovum was probably behind the decline of fertility in the autotetraploids. Several factors may beinvolved- the low efficiency of diploid pollen (related to a relatively slow growth of the pollen tubes), anunbalanced meiosis for a great number of mother cells of pollen grains and a significant morphologicalmodification of the reproductive system due to the passage from the diploid to the tetraploid state.

Date: 2011
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