Abstract
ABSTRACT Pepper is one of the main vegetable crops commercialized in Brazil and it is grown throughout the country. The objective of this study was to estimate genetic parameters and predict the genotypic values involved in agronomic traits of hybrid pepper in two different cropping systems in order to verify adaptability and genotypic stability. The experiment was carried out at the Experimental Station Luiz Jorge da Gama Wanderley from IPA, located in Vitoria de Santo Antão, Pernambuco State, Brazil, from October 2010 to March 2011. Seven hybrids were evaluated in two trials, the first in conventional farming system and the second in organic cultivation system. Randomized blocks were used with seven treatments, four replications and plots consisting of six plants. We evaluated the following fruit variables: total mass (MTF), total number (NTF), average length (CMF), average diameter (DMF), number of locules (NL) and average thickness of the pericarp (EP). Statistical analyzes and estimation of genetic parameters were based on mixed models of type REML/BLUP, using the statistical model and software SELEGEN 151. All traits showed good accuracy. The genotype average heritability (h2mg) was lower than 80% only for the trait NTF. Some characters had h2mg close to 100% such as CMF and DMF with 99.1% and 98.3%, respectively. The hybrids presenting a predicted genotypic effect higher than the average were: Atlantis, Máximos, Solario and Rubia R for NTF, Solario and Atlantis for MFT, Impacto, Máximos, Atlantis, Hebron and Rubia R to CMF, Solario and Enterprise for DMF, Solario, Impacto, Rubia R and Atlantis for NL and Solario and Enterprise for EP. Hybrids presenting the highest performance in the traits evaluated for each system were the same selected based on the joint analysis of the studied systems, showing stability and enabling their indication for organic and conventional cropping systems.
Highlights
O pimentão é cultivado em todo território nacional, estando entre as principais olerícolas comercializadas no país
According to a socioeconomic survey on the vegetables production chain in Brazil, carried out by Associação Brasileira do Comércio de Sementes e Mudas (ABCSEM), sweet pepper production value exceeds R$ 360 million and it is among the 10 largest vegetable production value paid to producers in the years 2010 and 2011 (ABCSEM, 2011), highlighting the importance of this vegetable in the Brazilian market
The aim of this work was to estimate genetic parameters and predict genotypic values involved in agronomic traits of commercial hybrids of sweet pepper, under two different growing systems, in order to verify genotype adaptability and stability
Summary
O pimentão é cultivado em todo território nacional, estando entre as principais olerícolas comercializadas no país. O objetivo deste trabalho foi estimar os parâmetros genéticos e predizer os valores genotípicos envolvidos em caracteres agronômicos de híbridos de pimentão, em dois diferentes sistemas de cultivo, a fim de verificar a adaptabilidade e estabilidade genotípica. Os híbridos de maior desempenho nos caracteres avaliados para cada sistema foram os mesmos selecionados com base na análise conjunta dos sistemas, evidenciando estabilidade e possibilitando a indicação destes para ambos os sistemas de cultivo. The aim is to identify cultivars with better performance in specific environmental conditions According to this author, the estimate of the component (Vg) is carried out using analysis of joint variance of environments. This procedure does not make it possible to quantify the magnitude of IGE associated with each genotype
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