Prediction of Genotypic Values and Selection Gains in Peanut Lines Derived from a Synthetic Amphidiploid
Jean Pierre Cordeiro Ramos
Programa de Pós-Graduação em Agronomia, Universidade Federal da Paraíba, Rodovia PB 079, KM 12, CEP 58397-000, Areia-PB, Brasil.
Wellison Filgueiras Dutra
Programa de Pós-Graduação em Agronomia, Universidade Federal da Paraíba, Rodovia PB 079, KM 12, CEP 58397-000, Areia-PB, Brasil.
Yrlânia de Lira Guerra
Programa de Pós-Graduação em Agronomia, Melhoramento Genético de Plantas, Universidade Federal Rural de Pernambuco, Rua Dom Manoel de Medeiros, s/n, Dois Irmãos - CEP: 52171-900, Recife-PE, Brasil.
Lucas Nunes da Luz
Instituto de Desenvolvimento Rural, Universidade da Integração Internacional da Lusofonia Afro-Brasileira, Avenida Abolição, 3, Centro, CEP: 62790-000, Redenção-CE, Brasil.
José Jaime Vasconcelos Cavalcanti
Laboratório de Biotecnologia, Embrapa Algodão, Rua Oswaldo Cruz, nº 1143, Centenário, CEP 58428-095, Campina Grande-PB, Brasil.
Carliane Rebeca Coelho da Silva *
Pós-Doc - RENORBIO/UFRPE, Rua Dom Manoel de Medeiros, s/n, Dois Irmãos - CEP: 52171-900, Recife-PE, Brasil.
Soraya Leal Bertioli
Department of Plant Pathology, Center for Applied Genetic Technologies, University of Georgia, Athens, GA, United States of America.
David Bertioli
Department of Crop and Soil Science, Center for Applied Genetic Technologies, University of Georgia, Athens, GA, United States of America.
Roseane Cavalcanti dos Santos
Laboratório de Biotecnologia, Embrapa Algodão, Rua Oswaldo Cruz, nº 1143, Centenário, CEP 58428-095, Campina Grande-PB, Brasil.
*Author to whom correspondence should be addressed.
Abstract
Genotypic values and selection gains were estimated in peanut lines derived from backcrossing with synthetic amphidiploid (A. batizocoi x A. duranensis)4x and a commercial cultivar, based on agronomical traits. Thirteen BC1F3 lines were grown in the field and submitted to 21 d of water suppression. Two earliness and drought tolerant cultivars (BR 1 and Senegal 55 437) were used as controls. Eight agronomic traits were adopted to characterize the lines. The estimates were based on mixed models (REML/BLUP) and Sum of Ranks Selection Index. We found that residual variance was greater than genotypic one, indicating the existence of variability within the families. Most traits showed high accuracy values. Three families showed an increased number of pods/plant, pod length and several seeds/pod. Negative gains were achieved for time for blooming and full pod maturation. As these traits are used as criteria for selection for earliness, these results favour the identification of short-cycle plants and prone to tolerate dry environments.
Keywords: Arachis hypogaea, selection index, water stress, REML/BLUP, genetic gains.