Mode of inheritance of petiole angle and length in the F1 and F2 generations of some sunflower inbred lines
1999
Hladni, N. (Naucni institut za ratarstvo i povrtarstvo, Novi Sad (Yugoslavia)) | Skoric, D. | Kraljevic-Balalic, M.
In order to enable progress in sunflower breeding, an increasing amount of attention has to be payed to the morpho-physiological traits of this crop that have a significant effect on its yield. The development of inbred lines with high combining abilities is of great importance in developing SC hybrids with both as high a potential for yield as possible and good morpho-physiological traits. In the present study, significant differences were found among six inbreds and hybrids in the F1 and F2 generations regarding petiole angle and petiole length. Petiole angle and petiole length are determined by additive and non-additive gene effects, where additive ones are the predominant type, as shown by the GCA (general combining ability)/SCA (special combining ability) ratio. In the study, it was found lines with negative GCA values but good GCA for reduced petiole angle (NS-BD inbred line) and petiole lenght (NS-NDF inbred line). This study will find its application in the development of new genotypes with altered plant architecture, i.e. altered leaf architecture (reduced petiole angle and petiole length). With its morphological traits, the hybrid NS-NDF x NS-K is an example of the optimum model of NS sunflower hybrid with altered plant architecture suitable for growing in stands with a larger plant number per unit area.
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