Estimation of genetic parameters and selection for rooting capacity in peach

Abstract

One of the most important criteria in the improvement of rootstocks is easiness of propagation. The objective of the present study was to verify the existence of genetic variability and the possibility of gains with selection in the rooting capacity among peach genotypes. Seventy-seven genotypes of peach belonging to five F 3 families were evaluated. Rooting percentage (RP), number of roots per cutting (NR) and mean root length (RL) were evaluated. Genetic values were estimated. The nineteen genotypes with the lowest rank summation index were selected to estimate the genetic gains. The variables RP, NR and RL had progeny mean heritabilities of 0.53, 0.60 and 0.83, respectively. Of the individuals selected, 89.5% belonged to the 713 (Talismã x Adafuel) family. The estimation of the genetic and phenotypic parameters show the possibility of success by selecting superior genotypes, with gains of 9.09, 17.47 and 24% for RP, NR and RL, respectively.

Organoleptic, nutritional and anti-carcinogenic characteristics of the fruit and rooting performance of cuttings of black mulberry (Morus nigra L.) genotypes

“…There were genotypes whose cuttings rooted profoundly, both as softwood leafy and as hardwood cuttings (H3, ANS7 and ANS8), while there were also others which were found to be quite (ANS6, ANS10) or extremely (ANS12) recalcitrant to root. Similar results have been reported by other researchers too, regarding mulberry genotypes' rooting behaviour [11,18,19], while the same has been encountered in many other species too [20,21]. Koyuncu and Senel [19] attributed the low percentages observed mainly to the genetic material employed and secondly to the environmental factors during the rooting period.…”

Selection between and within half-sibling progenies of Ilex paraguariensis for adventitious rooting of mini-cuttings

“…According to Bezerra et al (2020) this shows the existence of variability that can be exploited by selection and, consequently, the possibility of identifying superior genotypes for these traits. The CV gi values between 25.9% and 41.6% were observed for rooting traits of P. persica cuttings (Oliveira et al 2018). CV gi values between 10.4% and 17.6% resulted in genetic gains from selection of 4.2% and 7.2%, respectively, for height and diameter of mate seedlings (Costa et al 2009).…”

Reproductive phenology, morphoagronomic variability, and selection of mother plants of Hancornia speciosa Gomes (Apocynaceae)

“…The use of the Mulamba and Mock selection index is promising in genetic breeding programs for fruit species (Barth et al 2020;Oliveira et al 2018), with advantages such as relative simplicity and ease of application. The ideotype defined here to classify the trees (short plants, with voluminous fruits, and high productivity) considered attributes that are usually sought in other fruit trees (Castro et al 2020;Costa et al 2020), aiming at great aptitude for commercial cultivation and the consumer market.…”