Data/hora: 11/06/2024 02:18:51

Biblioteca(s): | Embrapa Mandioca e Fruticultura.
Data corrente: | 20/11/1995
Data da última atualização: | 20/11/1995
Autoria: | VENDENHOUT, H.; ORTIZ, R.; VUYLSTEKE, D.; SWENNEN, R.; BAI, K. V.
Afiliação: | International Institute of Tropical Agriculture (IITA), Onne Station, PMB 5320, Oyo RD., Ibadan; Treymanslaan 32, 2300 Turnhout, Belgium; Katholieke Universiteit Leuven, Laboratory of Tropical Crop Husbandry.
Título: | Effect of ploidy on stomatal and other quantitative traits in plantainand banana hybrids.
Ano de publicação: | 1995
Fonte/Imprenta: | Euphytica, v.83, n.2, p.117-122, 1995.
ISSN: | 0014-2336
Idioma: | Inglês
Conteúdo: | Ploidy polymorphism occurs in the hybrid offspring derived from interspecific crosses between triploid plantains (Musa spp. AAB group) and diploid bananas (M. acuminata). Therefore, Musa breeders are interestedin the determination  of ploidy and is effects on phenotypic expression of quantitative traits. The aim of this research was to examine the reliability of stomatal and other phenotypic traits to determine ploidy in segregating plantain-banana hybrid families. Stomatal density andsize were significantly correlated (P<0.01) with ploidy, although the correlation coefficients were not high (r= -0.49 and r=0.47, for stomatal density and size, respectively). High density of small stomata was correlated with low ploidy level, and vice versa. However, stomatal  size and density were also influenced by a significant genotype effect (P<0.001) within the same ploidy level. Ploidy had an important effect on fruit traits and plant height in the hybrids of Obino 1 Ewai x Calcutta 4, but this was not so clear in Bobby Tannap x Calcutta 4 hybrids. obino 1 Ewai derived tetraploids have medium to tall plants with large bunches and bigh fruits. Most of the tetraploids derived from Bobby Tannap have short stature due to the gene action of the dwarf, dw, allele. Also, a few selected diploids derived from Bobby Tannap outyielded their non-selected tetraploid full-sibs. In conclusion, chromosome counting remains the only accurate proof of ploidy levels in Musa germplasm.
Palavras-Chave: | Diversity; Plantain; Ploidy determination.
Thesagro: | Banana.
Thesaurus Nal: | breeding; genetics; Musa; polyploidy.
Categoria do assunto: | --
Registro original: | Embrapa Mandioca e Fruticultura (CNPMF)
Exemplares: | CNPMF - (3581-1) - ADC - AP - -- - 575.05 -  - 575.05 - DIS