Agronomic performance of recombinant chili pepper inbred lines in two cultivation systems

摘要

> face="Verdana, Arial, Helvetica, sans-serif" size="2">Climate and management diversity play an important role in crop production, since these characteristics are related to genotype and cultivation environment. The aim of this study was to evaluate the effects of genotype, environment and genotype-environmental interaction (GE) in 12 recombinant inbred lines of C. annuum. These lines were originated from crosses between the following accessions: a sweet pepper cultivar (susceptible to bacterial spot) and a chili pepper (resistant to bacterial spot). Two tests were conducted, the first in a conventional agriculture system, under field conditions and the second in ecological or organic system, under greenhouse conditions. The field experiment was carried out in Campos dos Goytacazes, RJ. The greenhouse experiment was conducted in Seropédica, RJ. Both experiments were performed using a randomized block design with three replications. The measured variables were total fruit number (TFN); total fruit weight (TFW); mean fruit weight (MFW); fruit length (FL); fruit diameter (FD); length/diameter fruit ratio (FL/FD) and capsaicin presence (CAPS). Data obtained for each experimental condition were submitted to variance analysis, joint variance analysis, and partitioning of genotype environment interaction. Genotype and GE quadratic components, genotypic determination coefficient, genetic variation coefficient and variation index were determined. The GE interaction was significant for TFN, TFW, MFN, FD, and FL/FD. Cultivation under greenhouse conditions was responsible for the highest mean performance for every trait studied but FL. Values observed for genetic variation were greater than values obtained for environmental variation. For field conditions, the high yield ability observed for line 2 (pungent) is suggestive of a potential to be used as a commercial genotype. For greenhouse conditions, line 8 (pungent), had higher fruit number yield. Line 1 (non-pungent) also seems promising for commercial cultivation under both conditions.