Heritability of peach tree resistance to bacterial leaf spot

Abstract

-The objective of this work was to evaluate the broad-sense heritability reaction to bacterial leaf spot (Xanthomonas arboricola pv. pruni), in peach tree populations obtained from directed crosses. Disease severity and defoliation of the genotypes were evaluated in field conditions, with posterior measurement of the healthy leaf area duration (HAD). The observed average heritability (0.51) indicates that the use of the evaluated genitors can be effective for the development of cultivars with higher resistance to the disease.Index terms: Prunus persica, Xanthomonas arboricola pv. pruni, cultivar development, healthy area duration. Herdabilidade de resistência de pessegueiro à bacteriose foliarResumo -O objetivo deste trabalho foi avaliar a herdabilidade no sentido amplo da reação à bacteriose foliar (Xanthomonas arboricola pv. pruni), em populações de pessegueiro obtidas de cruzamentos dirigidos. A severidade da doença e a desfolha dos genótipos foram avaliadas em campo, com posterior mensuração da duração da área foliar sadia (HAD). A herdabilidade média observada (0,51) indica que a utilização dos genitores avaliados pode ser efetiva para o desenvolvimento de cultivares com maior resistência à doença.Termos para indexação: Prunus persica, Xanthomonas arboricola pv. pruni, desenvolvimento de cultivares, duração da área foliar sadia.

Estimation of genetic parameters and selection for rooting capacity in peach

“…The magnitude of the heritability obtained shows that a moderate genetic control can be obtained, which ensures that the selection, at individual and progeny levels, would provide significant gains for the trait. Varago et al (2017) discuss that the individual heritability of 51.4% found in the selection of peach genotypes for resistance to bacterial leaf spot (Xanthomonas arboricola pv. pruni) implies the existence of genetic variability in the studied progeny, enabling us to infer that selection may be effective for obtaining genetic gains for the evaluated characteristic.…”

Standard Area Diagram Set for Bacterial Spot Quantification in Entire-Margined Leaves of Sour Passion Fruit

“…The increase in accuracy and precision of visual estimates, particularly those performed by inexperienced raters, has already been reported for different SADs developed for the evaluation of bacterial spot in several crops (Braido et al, 2015;Duan, Zhao, Wang, & Yang, 2015;Nuñez et al, 2017). These diagrams have been used directly in breeding programs, aiding in disease resistance and genotype selection evaluations (Berrueta, Gimenez, Galvan, & Borges, 2016;Varago, Citadin, Sachet, Penso, & Raseira, 2017). It has also indirectly helped out these researches, subsidizing studies on the efficiency of control methods for diseases caused by Xanthomonas (Itako, Tolentino Jr., Silva Jr., Soman, & Maringoni, 2015;Rodrigues, Bueno, & Tebaldi, 2016).…”