Genetic parameters and simultaneous selection using traits of ornamental interest in pepper plants

ABSTRACT Pepper plants of the genus Capsicum are widely grown worldwide. The Capsicum annuum species shows ornamental potential; nevertheless, in the state of Piauí, there has been a lack of studies on its performance, related to quality traits needed to meet market demand. The aim of this study was to estimate the genetic parameters and associations between traits of ornamental interest in C. annuum in order to indicate, by simultaneous selection of traits, accessions to start an ornamental pepper breeding program in Piauí. We evaluated 16 accessions of C. annuum under plastic house conditions at Universidade Federal do Piauí. Number of days to flowering, number of days to fruit maturation, plant height, number of fruits per plant, fruit persistence, fruit length, fruit width, leaf length and fruit weight were evaluated. A significant difference (p≤0.01) between accessions for all traits was noticed. Coefficient of genetic variation / coefficient of experimental variation [Cvg/Cve (%)] ratios were greater than 1 and the genotypic determination coefficient (H²) values were all greater than 89.95%. The estimates of the genotypic correlations were higher in relation to phenotypic correlations in most of the traits, however, according to path analysis, an effect of residual variable (0.59) was verified. According to the results, the accessions BAGC 98, 199, 207 and 236 can be used as parents to start an ornamental pepper breeding program in Piauí.

摘要：辣椒属（Capsicum）辣椒在全球范围内广泛种植。一年生辣椒（Capsicum annuum）具备观赏潜力，但在皮奥伊州，针对其符合市场需求的品质性状表现的相关研究仍较为匮乏。本研究旨在估算一年生辣椒观赏相关性状的遗传参数与性状间关联，通过多性状同步筛选，为皮奥伊州观赏辣椒育种项目遴选初始种质材料。本研究于皮奥伊联邦大学（Universidade Federal do Piauí）的塑料大棚环境下，对16份一年生辣椒种质开展了性状评价。测定性状包括：开花天数、果实成熟天数、株高、单株结果数、果实挂果持久性、果实长度、果实宽度、叶片长度及单果质量。所有性状的种质间差异均达极显著水平（p≤0.01）。遗传变异系数与试验变异系数的比值[Cvg/Cve (%)]均大于1，基因型决定系数（H²）均高于89.95%。多数性状的基因型相关系数高于表型相关系数，但通径分析结果显示存在0.59的残差效应。综合研究结果，种质BAGC 98、199、207及236可作为亲本，用于启动皮奥伊州的观赏辣椒育种项目。