title: Mode of inheritance for biochemical traits in genetically engineered cotton under water stress.
abstract: Drought is an abiotic environmental stress that can significantly reduce crop productivity. We examined the mode of inheritance for different biochemical traits including total soluble proteins, chlorophyll a, chlorophyll b, total chlorophyll, carotenoids, total phenolic contents and enzymatic antioxidants (superoxide dismutase, peroxidase and catalase), and their relationship with Bacillus thuringiensis (Bt) toxin under control and drought conditions. Eight genetically diverse cotton genotypes were selfed for two generations to ensure homozygosity. Fifteen F1 hybrids were developed by crossing five non-Bt female lines with three Bt male testers. The F1 hybrids and eight parents were finally evaluated under control (100 % field capacity (FC)) and drought (50 % FC) conditions in 2013. The biochemical traits appeared to be controlled by non-additive gene action with low narrow sense heritability estimates. The estimates of general combining ability and specific combining ability for all biochemical traits were significant under control and drought conditions. The genotype-by-trait biplot analysis showed the better performance of Bt cotton hybrids when compared with their parental genotypes for various biochemical traits under control and drought conditions. The biplot and path coefficient analyses revealed the prevalence of different relationships between Cry1Ac toxin and biochemical traits in the control and drought conditions. In conclusion, biochemical traits could serve as potential biochemical markers for breeding Bt cotton genotypes without compromising the optimal level of Bt toxin.
authors.affiliation: Genomics Lab, Department of Plant Breeding and Genetics, Faculty of Agricultural Sciences and Technology, Bahauddin Zakariya University, Multan 60000, Pakistan Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, 100081 Beijing, China.
authors.forename: Muhammad Ali
authors.initials: MA
authors.lastname: Abid
authors.affiliation: Genomics Lab, Department of Plant Breeding and Genetics, Faculty of Agricultural Sciences and Technology, Bahauddin Zakariya University, Multan 60000, Pakistan Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, 100081 Beijing, China waqasmalik@bzu.edu.pk.
authors.forename: Waqas
authors.initials: W
authors.lastname: Malik
authors.affiliation: Department of Agronomy, Faculty of Agricultural Sciences and Technology, Bahauddin Zakariya University, Multan 60000, Pakistan.
authors.forename: Azra
authors.initials: A
authors.lastname: Yasmeen
authors.affiliation: Genomics Lab, Department of Plant Breeding and Genetics, Faculty of Agricultural Sciences and Technology, Bahauddin Zakariya University, Multan 60000, Pakistan.
authors.forename: Abdul
authors.initials: A
authors.lastname: Qayyum
authors.affiliation: Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, 100081 Beijing, China.
authors.forename: Rui
authors.initials: R
authors.lastname: Zhang
authors.affiliation: Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, 100081 Beijing, China.
authors.forename: Chengzhen
authors.initials: C
authors.lastname: Liang
authors.affiliation: Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, 100081 Beijing, China.
authors.forename: Sandui
authors.initials: S
authors.lastname: Guo
authors.affiliation: Genomics Lab, Department of Plant Breeding and Genetics, Faculty of Agricultural Sciences and Technology, Bahauddin Zakariya University, Multan 60000, Pakistan.
authors.forename: Javaria
authors.initials: J
authors.lastname: Ashraf
keywords: Biochemical markers; Cry1Ac toxin; carotenoids; enzymatic antioxidants; non-additive gene action
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