Selection for Improving Field Resistance to Capsicum Chlorosis Virus and Yield-related Traits Using Selection Indices in Peanut Breeding
Jetsada Authrapun1, Udomsak Lertsuchatavanich2 and Dingming Kang1*
1College of Agronomy and Biotechnology, China Agricultural University, Beijing, China
2Department of Plant Pathology, Faculty of Agriculture, Kasetsart University, Bangkok, Thailand
*Corresponding Author: Dingming Kang, College of Agronomy and Biotechnology, China Agricultural University, Beijing, China.
Received: April 15, 2021; Published: May 11, 2021
Capsicum chlorosis virus (CaCV) is a pathogen causing a severe disease in peanut. Therefore, the aim of this study was to select peanut genotypes for improving field resistance to CaCV disease and yield using two selection indices, including a multitrait index based on factor analysis and ideotype-design (FAI-BLUP index) and a multi-trait stability index (MTSI). The 121 genotypes were evaluated under natural infection at the disease hotspots in Thailand from 2017 to 2018, totalling three environments. The experimental design was a randomized complete block with two replications. The 11 traits related to disease resistance and yields such as percentage of disease incidence (DisInc), the area under disease progress curve (AUDPC), pod yield (PY), harvest index (HI), number of pod per plant (PdPt), pod weight per plant (PWPt), seed weight per plant (SWPt), shelling percentage (SH), hundred seed weight (100SW), seed length (SdLgth) and seed width (SdWdth) were collected and used for simultaneous selection. After the selection considering a selection intensity of 15%, the selection differentials and selection gains obtained by the FAI-BLUP and MTSI indices were positive for almost yield-related traits except for SH and negative for DisInc and AUDPC, which want to be increased and decreased, respectively, indicating that these selection indices provide desirable genetic gains for all traits simultaneously. The genotypes selected by the two selection indices had a good performance for both disease resistance and yield characters. The FAI-BLUP and MTSI indices are efficient method for multi-trait selection and can be used as a tool in selecting promising genotypes based on several targeted traits in plant breeding programs.
Keywords: Arachis hypogaea L; Field Resistance; FAI-BLUP Index; Multi-trait Stability Index; Selection Gain
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