Hybridization among wild passionflower species

Abstract

-(Hybridization among wild passionflower species). Passion fruits are appreciated for their ornamental value, since their flowers are showy and display a wide variety of colors. In addition, many hybrids have been produced and used in other countries. The genotypes used in selection of plants with ornamental characteristics are hybrid progenies which are used in various crossing strategies. Thus, the aim of this work was to obtain interspecific hybrids, perform backcrossing and obtain progenies from crossings between hybrids, and to determine the reproductive compatibility between the progenitors involved. Key words -interspecific crossing, ornamental plants, Passiflora, seed germination RESUMO -(Hibridação entre espécies silvestres de passifloras). As passifloras são apreciadas por seu valor ornamental, pois suas flores são vistosas e com enorme diversidade de cores, e muitos híbridos têm sido produzidos e utilizados em outros países. As fontes para seleção de plantas com características ornamentais são progênies híbridas utilizadas em variadas estratégias de cruzamentos. Assim, os objetivos do trabalho foram obter híbridos interespecíficos, realizar retrocruzamentos e obter progênies de cruzamentos entre híbridos e, desta forma, verificar a compatibilidade reprodutiva entre os genitores envolvidos. Foram registrados o percentual de flores fertilizadas e de germinação, além do número de frutos, de sementes e de plantas obtidos por cruzamento. Realizaram-se 374 hibridações envolvendo sete espécies e dois híbridos. Cruzamentos como Passiflora gibertii N. E. Palavras-chave -cruzamentos interespecíficos, germinação de sementes, Passiflora, plantas ornamentais

ISSR markers in wild species of Passiflora L. (Passifloraceae) as a tool for taxon selection in ornamental breeding

“…Despite the weak reproductive barriers between species of the Passiflora genus, the artificial production of hybrids has only been reported for species that share the same diploid chromosome number; thus, this is an essential feature for the selection of genitors for hybridization (Conceição et al, 2011;Santos et al, 2012). Choice of parents for crosses can be made between taxa assigned to distinct groups by UPGMA clustering (dendrogram) to obtain progeny with higher fitness, for example, between P. filamentosa (group I) x P. suberosa (group V), which have 2n = 18, or P. misera (group I) x P. micropetala (group III), which have 2n = 12.…”

Tissue culture and biotechnological techniques applied to passion fruit with ornamental potential: an overview

“…are already described as ornamental plant such as; Passiflora alata (Figure 2A), Passiflora setacea (Oliveira and Ruggiero, 2005), Passiflora amethystina, Passiflora actinia, Passiflora triloba Ruiz & Pav. EX DC (Peixoto, 2005), Passiflora caerulea (Conceição et al, 2011), Passiflora cincinnata ( Figure 2B) (Oliveira and Ruggiero, 2005); Passiflora mucronata (Meletti et al, 2011), Passiflora morifolia, Passiflora suberosa litoralis, Passiflora palmeri var. sublanceolata (Pires et al, 2012), Passiflora capsularis, Passiflora rubra (Amorim et al, 2011).…”

“…Currently, passion flower hybryds; e.g. Passiflora 'Albo-nigra', P. 'Amethyst', P. 'Star of Bristol', and P. 'Star of Kingston' obtained P. alata and P. caerulea have been used for decoration of European and American greenhouses (Ulmer and Macdougal, 2004;Conceição et al, 2011).…”

Research Article Contributions of classical and molecular cytogenetic in meiotic analysis and pollen viability for plant breeding.

“…The crossing between species with different chromosome numbers can be difficult, since the chromosome number is a limiting factor for the occurrence of a regular meiosis with all chromosomes paired in meiosis I. The interspecific cross between Passiflora sublanceolata (2n = 22) vs P. cincinnata (2n = 18) was probably unsuccessful due to the fact that they possess different chromosome number (Conceição et al, 2011).…”