Influence of the direction of crossing on heterosis and transgression events in relation to the length of the vegetative period of Burley tobaccos variety group
Investigated are manifestations of real and hypothetical heterosis in terms of the length of vegetative period in ten hybrid combinations involving indigenous and introduced varieties of Burley tobacco. Each of them is represented by forward and reverse cross. The results show that more than half o...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Trakia University. Faculty of Agriculture, Stara Zagora
2015-03-01
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| Series: | Agricultural Science and Technology |
| Subjects: | |
| Online Access: | http://agriscitech.eu/wp-content/uploads/2015/03/009.pdf |
| Summary: | Investigated are manifestations of real and hypothetical heterosis in terms of the length of vegetative period in ten hybrid combinations involving
indigenous and introduced varieties of Burley tobacco. Each of them is represented by forward and reverse cross. The results show that more than half of the
Burley tobacco hybrid combinations observed significant negative heterosis. Heterozis effect is influenced positively by distance of parents used for
hybridization, and the participation of a variety Burley 1344, regardless of whether maternal or paternal component. The direction of crossing influences
manifestations of heterosis effect in terms of length of the vegetative period at cross examined Burley tobacco. Heterosis effect is more pronounced when a
local variety or line is used as a mother component and an imported variety is used as a father component. Transgressive manifestations in the studied hybrids
in the second generation in terms of length of the vegetative period presented by degree and frequency are relatively low presented and do not have great
importance for the selection practice. The direction of crossing influences the degree and to a lesser extent the frequency of transgressive events. Strong
relationship between manifestations of heterosis and transgression has not been observed. |
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| ISSN: | 1313-8820 1314-412X |