Combining ability and gene action studies for drought tolerance in tomato
محورهای موضوعی : Stress Physiology
Maryam Noori
1
(Former Ph.D. Student, Department of Horticulture, Faculty of Agriculture, University of Tabriz, Iran)
Alireza Motallebi Azar
2
(Department of Horticultural Sciences, Faculty of Agriculture, University of Tabriz, Postal code)
Jaber Panahandeh
3
(Department of Horticultural Sciences, Faculty of Agriculture, University of Tabriz,)
Mehdi Saidi
4
(Ilam University, College of Agriculture, Department of Horticulture)
Ali Akbar Asadi
5
(Crop and Horticultural Science Research Department, Zanjan Agriculture and Natural Resources Research and Educational Center (AREOO), Zanjan, Iran.)
Davoud ZareHaghi
6
(Associate Professor, Department of Soil Science, Faculty of Agriculture, University of Tabriz, Iran)
Shahnaz Fathi
7
(AssistantProfessorUniversity, ShahidBakeriHighEducationCenterofMiandoab,Iran)
کلید واژه: combing ability, drought stress, gen action, line × tester, peroxidase ,
چکیده مقاله :
Physiological traits of tomato including its resistance to stresses are a main breeding goal in producing new cultivars. This study reports on a combining ability analysis investigating the variance of general and specified combing abilities for some important physiological characteristics as a whole as well as their effects for individual parents and hybrids of 19 tomato genotypes of tomato under drought stress. Three commercial innate lines and four analyzers were used in a line-to-tester crossing plan at Ilam University, Iran. There was a significant difference between genotypes (parents and crosses) in all characteristics at three levels of stress. Evaluating the impacts of common combining capacity analyzers and lines showed that neither a single line nor an analyzer was a commendable common combiner for all of the characteristics examined at all three push levels. Estimation of the effects of specific combining ability indicated that for each specific physiological trait, a specific hybrid showed the highest effect at all three stress levels. In all of the traits under study, specific combining ability variance had a higher estimation than general combining ability variance, and the genetic variance ratio of additive variance to non-additive variance was smaller than one, indicating that non-additive gene action predominated in the inheritance of all of the characteristics in the three levels of stress. The degree of dominance under three levels of stress was higher than one for all attributes except total soluble solids, and it seems that dominance in the genetic locations controlling these traits is superseded.
Physiological traits of tomato including its resistance to stresses are a main breeding goal in producing new cultivars. This study reports on a combining ability analysis investigating the variance of general and specified combing abilities for some important physiological characteristics as a whole as well as their effects for individual parents and hybrids of 19 tomato genotypes of tomato under drought stress. Three commercial innate lines and four analyzers were used in a line-to-tester crossing plan at Ilam University, Iran. There was a significant difference between genotypes (parents and crosses) in all characteristics at three levels of stress. Evaluating the impacts of common combining capacity analyzers and lines showed that neither a single line nor an analyzer was a commendable common combiner for all of the characteristics examined at all three push levels. Estimation of the effects of specific combining ability indicated that for each specific physiological trait, a specific hybrid showed the highest effect at all three stress levels. In all of the traits under study, specific combining ability variance had a higher estimation than general combining ability variance, and the genetic variance ratio of additive variance to non-additive variance was smaller than one, indicating that non-additive gene action predominated in the inheritance of all of the characteristics in the three levels of stress. The degree of dominance under three levels of stress was higher than one for all attributes except total soluble solids, and it seems that dominance in the genetic locations controlling these traits is superseded.
