Contribution of production and seed variables to the genetic divergence in passion fruit under different nutrient availabilities

Abstract

-The objective of this work was to evaluate the relative contribution of variables related to fruit production and to seed morphophysiological characteristics to the genetic divergence in passion fruit (Passiflora edulis) progenies, aiming at selecting progenies potentially responsive to fertilization. Ten progenies were evaluated under conditions of low (50% of the recommended dose of fertilizers) and high soil fertility (dose 50% higher than the recommended one), regarding variable sets related to production and to the morphological and physiological characteristics of seeds. The association between these sets was determined by the canonical correlation analysis and by the nearest-neighbor clustering method. The nutritional environments interfered in the relative contribution of the variables to the genetic divergence of the progenies. The accelerated aging test of seeds -from the set of seed physiological quality -did not contribute significantly to the selection of genotypes responsive to soil fertilization. The most responsive progenies to the increased availability of nutrients were grouped according to the production variables that were evaluated under high soil fertility. Irrespectively of the evaluated environment, the set of production variables is the one that contributes more expressively to the identification of the genetic divergence of passion fruit progenies.Index terms: Passiflora edulis, canonical analysis, cluster analysis, fruit quality, responsiveness to fertilization, seed physiological quality. Contribuição de variáveis de produção e de semente para a divergência genética em maracujazeiro-azedo sob diferentes disponibilidades de nutrientesResumo -O objetivo deste trabalho foi avaliar a contribuição relativa de variáveis relacionadas à produção de frutos e a características morfofisiológicas das sementes para a divergência genética em progênies de maracujazeiro-azedo (Passiflora edulis), com vistas à seleção de progênies potencialmente responsivas à fertilização. Dez progênies foram avaliadas em condições de baixa (50% da dose recomendada de fertilizantes) e alta fertilidade do solo (dose 50% superior à recomendada), quanto a conjuntos de variáveis de produção e de características morfológicas e fisiológicas das sementes. A associação entre esses conjuntos foi determinada pela análise de correlação canônica e pelo método de agrupamento do vizinho mais próximo. Os ambientes nutricionais interferiram na contribuição relativa das variáveis para a divergência genética das progênies. O teste de envelhecimento acelerado das sementes -do conjunto de variáveis de qualidade fisiológica -não contribuiu significativamente para a seleção de genótipos responsivos à adubação. As progênies mais responsivas ao aumento da disponibilidade de nutrientes foram agrupadas de acordo com as variáveis de produção avaliadas em condições de alta fertilidade do solo. Independentemente do ambiente avaliado, o conjunto de variáveis de produção é o que mais expressivamente contribui para a identificação da diver...

Genetic divergence for seed traits in Passiflora full-sib families under recurrent selection for resistance to the cowpea aphid-borne mosaic virus

“…The clustering of FSFs into four different groups based on physical and physiological seed traits indicates the existence of genetic variability between the genotypes and, consequently, their potential for selection. Similar results were described in studies evaluating seed traits in different passion fruit genotypes (Marostega et al 2017, Rodrigues et al 2017, Rosado et al 2017, Torres et al 2019.…”

Contribution of seed traits to the genetic diversity of a segregating population of Passiflora spp.

“…Cerqueira -Silva et al (2009) evaluated intra-and interspecific genetic dissimilarity between genotypes of P. edulis and P. setacea via physicochemical descriptors -interspecifically, mainly -and found variability between the genotypes. Rodrigues et al (2017) also observed groups of passionfruit progeny formed by the UPGMA method at three fertilization levels, in an evaluation of seed and yield variables. The progeny were clustered distinctly at the different fertilization levels, and the variables seedling length and germination speed index were positively correlated with number of fruits, pulp weight, and fruit weight in lower nutrient-availability conditions.…”

Seed Structural Variability and Germination Capacity in Passiflora edulis Sims f. edulis

“…Other possibilities could relate to genetic diversity among the groups, since passion fruit flowers are known to be primarily inbreeding but up to 70% outcrossing (Bruckner et al, 1995), crosses between low and high germination genotypes are needed. Seed quality can also relate to plant physiological differences during fruit production (Carvalho and Nakagawa, 2012;Lima et al, 2017;Fischer et al, 2018). Genebank accessions were briefly stored prior to the tests so some difference with landraces could be due to seed age (Larré et al, 2007).…”