Articles
Evaluation of combining ability in asparagus triploid hybrids using a North Carolina II mating design
Article number
1376_5
Pages
31 – 36
Language
English
Abstract
A high potential for the asparagus triploid hybrids (4x×2x) derived from crosses between female plants of the tetraploid landrace Morado de Huetor and diploid cultivated male plants has been reported in a previous study.
In the present study, five female tetraploid plants from Morado de Huetor were crossed with four diploid plants from current cultivars.
These crosses were performed following a North Carolina II (NC II) design.
Their progenies were planted in an experimental field plot following a randomized block design with 4 repetitions and they were evaluated for yield and spear thickness for three years.
General ability (GCA) for both female and male and specific combining ability (SCA) were assessed.
Significant differences among females were found for yield, explaining a high variation of the total variance among progenies.
Male × female interactions were also significant but explain a lower percentage of the total variance among progenies.
For spear thickness, significant differences were found among both females and males, making the male × female interaction highly significant.
These results suggest a major presence of additive effects for yield and both additive and non-additive (dominance and epistatic interactions) for spear thickness.
The tetraploid female HT340 showed the highest positive and significant GCA for both yield and spear thickness, and the hybrids HT349 × CM064 and HT200 × CM064 showed the best positive and significant SCA for spear thickness.
In the present study, five female tetraploid plants from Morado de Huetor were crossed with four diploid plants from current cultivars.
These crosses were performed following a North Carolina II (NC II) design.
Their progenies were planted in an experimental field plot following a randomized block design with 4 repetitions and they were evaluated for yield and spear thickness for three years.
General ability (GCA) for both female and male and specific combining ability (SCA) were assessed.
Significant differences among females were found for yield, explaining a high variation of the total variance among progenies.
Male × female interactions were also significant but explain a lower percentage of the total variance among progenies.
For spear thickness, significant differences were found among both females and males, making the male × female interaction highly significant.
These results suggest a major presence of additive effects for yield and both additive and non-additive (dominance and epistatic interactions) for spear thickness.
The tetraploid female HT340 showed the highest positive and significant GCA for both yield and spear thickness, and the hybrids HT349 × CM064 and HT200 × CM064 showed the best positive and significant SCA for spear thickness.
Publication
Authors
R. Moreno, F. Flores, J. Rubio, J. Gil
Keywords
yield, spear thickness, additive and non-additive effects, general and specific ability
Groups involved
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