Estimates of genetic parameters for fruit yield and quality in custard apple progenies

Abstract

-Apparently, there are no custard apple cultivars defined for the northeastern region of Brazil. The establishment of breeding programs aimed at the selection of types from productive locations for later cloning is desirable. This work's objective was to evaluate the yield (during the first three crops) and quality (first crop) of fruits from 20 half-sibling custard apple tree progenies, selected from home orchards. An additional objective was to estimate genetic parameters for the traits evaluated. A micro sprinkling-irrigated experiment was conducted in Mossoró-RN, Brazil, as random blocks with five replications. In characteristics evaluated for periods longer than a year (diameter, height and mean weight of fruits, number of fruits ha -1 and fruit yield (kg ha -1 ), and a split-plot design was adopted, with progenies considered as plots and annual cropping seasons as subplots. The best progenies in terms of fruit yield (A3 and A4) are not necessarily the best for fruit dimensions and fruit mean weight (A2, FE4, JG1, JG2, SM1, SM7, and SM8). These progenies show great potential to be used in future studies on crosses or on vegetative propagation. In this regard, progeny JG2 should be highlighted as promising in terms of yield and fruit size. The progenies are not different with regard to percentages (in relation to mean fruit mass) of pericarp, endocarp, seeds, and receptacle, in the fruit, and fruit volume, number of seeds/fruit, and total soluble solids content in the fruit pulp, but progeny FE4 presents higher total titratable acidity in the fruit pulp. Narrow-sense heritability estimates were relatively high for all characteristics in which there was variability between progenies, with higher values for number of fruits ha -1 (80 %) and fruit yield (78 %). Relatively high coefficients of genotypic variation (around 20%) were observed for number of fruits ha -1 and fruit yield, with lower values for the other characteristics. There were positive genotypic and phenotypic correlations between fruit diameter (FD) and fruit height, FD and mean fruit weight, and number of fruits ha -1 and fruit yield. Index Terms: Annona squamosa L., bullock's heart, sweetsop, heritability, genotypic correlation ESTIMATIVAS DE PARÂMETROS GENÉTICOS DO RENDIMENTO E DA QUALIDADE DO FRUTO DE PROGÊNIES DA PINHEIRARESUMO -Aparentemente não existem cultivares de pinheira definidas para o Nordeste brasileiro. É desejável o estabelecimento de programas de melhoramento, visando à seleção de tipos de locais produtivos para posterior clonagem. O objetivo do presente trabalho foi avaliar o rendimento (nas três primeiras safras) e a qualidade (na primeira safra) dos frutos de 20 progênies de meias-irmãs de pinheiras, selecionadas em pomares caseiros. Um objetivo adicional foi a estimação de parâmetros genéticos para as características avaliadas. O experimento, irrigado por microaspersão, foi realizado em Mossoró-RN, em blocos ao acaso, com cinco repetições. Nas características avaliadas em três safras (diâmetro, altura e peso médio d...

Phenotypic variation and estimation of genetic parameters for plant growth, fruit quality traits and bacterial blight disease resistance in gamma () irradiated seed derived progenies and germplasms of pomegranate (Punica granatum L.)

“…Low PCV and GCV values were also reported for TSS, pH of juice (Faten and Messaoud, 2014) [13] , leaf breadth, fruit diameter (Munde, 2011) [30] , while moderate PCV and GCV values were reported for leaf length, fruit length, TSS, days to maturity and pH of juice (Munde 2011) [30] . The same results were reported by Moraes et al (2005) on the progenies of yellow passion fruit and by Silva et al (2007) [34] on custard apple. However, Da Silva et al (2008) [8] found higher GCV values (= 115%) for some morphoagronomic and fruit quality traits in papaya.…”

Uso do 1-MCP e atmosfera modificada na pós-colheita de atemoia ‘Gefner’

“…Segundo Kluge et al (2002) e Silva et al (2007) o ratio é utilizado como indicador para determinação do estádio de maturação do fruto, sendo um indicativo de qualidade, pois determina o balanço entre os sabores doce/ácido. Os frutos que foram armazenados sem embalagem não tiveram variação do ratio em função do tempo apresentando um ratio de 42,7 em média.…”

Caracterização de plantas e de frutos de araticunzeiro (Annona crassiflora Mart.) nativos no Cerrado Matogrossense

“…O SS médio encontrado no experimento é relativamente inferior ao SS da maioria das espécies de Annonaceae, que contêm aproximadamente 24 °Brix (NEVES; YUHARA, 2003;MARCELLINI et al, 2003;SILVA et al, 2007). Porém, o SS é variável entre espécies (MARCELLINI et al, 2003), entre cultivares da mesma espécie (NEVES; YUHURA, 2003;SILVA et al, 2003) e até entre porções do mesmo fruto (SILVA et al, 2003).…”