Heritability of Leucostoma persoonii Canker Resistance among Diverse Peach Genotypes

Abstract

<jats:p>Heritability and the genetic and environmental variance components of resistance to the canker-causing pathogen <jats:italic>Leucostoma persoorrii</jats:italic> were estimated in a population of diverse peach <jats:italic>(Prunus persica</jats:italic> L.)-genotypes. Disease resistance was measured as the length of necrotic tissue, i.e., canker length, following artificial inoculation in the field. Genetic and environmental variations were partitioned as variance components of the linear statistical model. Heritability was estimated by regressing average performance of seedlings on performance of their maternal parent. The genetic variance was highly significant, and the heritability for canker necrotic length was relatively high (0.72), suggesting that it should be possible to select <jats:italic>L. persoonii</jats:italic> -resistant individuals within the population.</jats:p>

Genetic studies on resistance to Valsa canker in apple: genetic variance and breeding values estimated from intra- and inter-specific hybrid progeny populations

“…The narrow-sense heritability ð b h 2 Þ estimated by sib analysis was moderate, 0.29 (Table 7). For a quantitative disease-resistance trait of fruit trees, it was consistent with the estimates found for fire blight (Luby et al 2002) and powdery mildew (Oraguzie and Currie 2004) in apple, fire blight in blackberry (Stewart et al 2005) and Anthracnose rot in blueberry (Polashock et al 2005), but it was lower than those reported for perennial canker in peach (Chang et al 1991), downy mildew in table grape (Brown et al 1999), Alternaria late blight in pistachio (Chao et al 2001) and scab in pecan (Thompson and Grauke 1994). While the narrow-sense h 2 estimate is not high, the value of 0.3-0.4 is still favorable and, as Durel et al (1998) pointed out, should guarantee the efficiency of mass selection especially for the trait of interest in apple.…”

Application of a Bayesian ordinal animal model for the estimation of breeding values for the resistance to <i>Monilinia fruticola</i> (G.Winter) Honey in progenies of peach [<i>Prunus persica</i> (L.) Batsch]

“…For another fungal infection, peach canker [ Leucostoma persoonii (Nitschke) Höhn. ], h 2 was estimated as 0.72 ( Chang et al 1991 ), which suggests that for this particular disease the inheritance tends to be Mendelian (one or two genes) rather than quantitative (more than three genes).…”