Correlations between yield and fruit quality characteristics of fresh market tomatoes

Abstract

Genotypic, phenotypic and environmental correlations were estimated for all possible pairs among eleven characters of tomatoes. Fifteen treatments including five parents and ten hybrids of Instituto Agronômico (IAC) tomato breeding program were evaluated using a randomized complete block experimental design, with tree replications in Itatiba, São Paulo state, Brazil, during 2005/2006. The following traits were evaluated: fruit yield per plant (FP), fruit number per plant (FN), average fruit weight (FW), cluster number per plant (CN), fruit number per cluster (FC), number of locules per fruit (NL), fruit length (FL), fruit width (WI), fruit wall thickness (FT), total soluble solids (SS), and total titratable acidity (TA). The genotypic (rG), phenotypic (rF) and environmental correlations (rA) for two pairs of plant traits were estimated using the Genes© program. High similarity was found among the estimates of genotypic and phenotypic correlations. Positive and high phenotypic and genotypic correlations were observed between FP and the traits FN, FW and FT, and these associations contributed for yield increasing. FW and FT contributed to yield increase and should be considered together as primary yield components in tomato. Positive values of the genotypic and phenotypic correlations revealed that FP influenced FN with high direct effect and significant positive correlation. These traits may be included as the main selection criteria for tomato yield improvement.

Parâmetros genéticos de famílias F2:3 de tomateiro para resistência à Ralstonia pseudosolanacearum e Ralstonia solanacearum

“…Sendo assim, a R. pseudosolanacearum se destacou e obteve maior estimativa de variância genética entre famílias (0,18) e dentro de famílias (0,09). A variância genética é a porção que orienta os programas de melhoramento, podendo ser usada para orientar as pesquisas, sendo assim o conhecimento da magnitude dos componentes da resistência a murcha bacteriana são de fundamental importância (FERREIRA et al, 2003;SOUZA et al, 2012).…”

“…Estes patógenos habitam o solo e invadem o sistema radicular por meio de ferimentos, multiplicam-se rapidamente dentro do xilema e por meio deste se distribui por toda a planta. Os principais sintomas são o escurecimento dos vasos do xilema e a murcha repentina sem alteração da coloração verde (WICKER et al, 2007).…”

Industrial tomato lines: morphological properties and productivity

“…Productivity is positively and significantly correlated with plant height, NB, NFR, fruit per plant, length and width of fruit, pericarp thickness, number of loci per fruit, average fruit weight, and fruit yield per plant (Mahapatra et al, 2013). The production of fruit per plant has been reported to be positively and significantly correlated (1% probability level) with the variables number of fruit per plant (0.944), average fruit weight (0.532 g), number of in florescences per plant (0.723), and number of fruit per inflorescence (0.822) (Souza et al 2012). Narolia et al (2012) recorded a smaller difference between the phenotypic and genotypic CV for NB and NFR per plant, regarding that these variables are less influenced by the environment.…”

Clasificación de frutos de tomates Cereza y Grape bajo diferentes sistemas de cultivo e intensidades de deshojado

“…Para ambas variedades, los coeficientes de determinación fueron R 2 = 0,93. Souza et al (2012) observaron una correlación positiva entre los caracteres de producción y calidad de los frutos de tomates de mesa, así como entre los caracteres de peso medio y diámetro de los frutos. De esta manera se puede demostrar que existe una relación entre las variables de tamaño y peso medio de los frutos de minitomates, con el fin de utilizar las variables para efectos de clasificación.…”