Data/hora: 24/06/2024 21:25:56

Biblioteca(s): | Embrapa Cerrados.
Data corrente: | 22/04/1999
Data da última atualização: | 22/04/1999
Autoria: | PANIZZI, M. C. C.
Título: | Potencial for narrow leaves in vegetable soybeans.
Ano de publicação: | 1985
Fonte/Imprenta: | [s.l.]: University of Florida, 1985.
Páginas: | 55p.
Idioma: | Inglês
Notas: | Tese Mestrado.
Conteúdo: | Several comparisons indicate that narrow leaf in soybean, Glycine max (L.) Merril, is associated with more seedsper pod. Vegetable-type soybean may often be shelled by hand; therefore any significat increase in weight of seeds per pod would be an advantage. The purpose of this study was to determine advantages and disadvantages of the narrow leaf trait in vegetable-type soybeans and to study the affects of narrow leaves on factors associated with seed yield and quality. Six pairs of narrow and broad leaf genotypes were studied in 1982, and a different set os six pairs of near isogenic lines differing in leaf shape were studied in 1983. No significant differences in seed yield or cooked seed falvor were observed between leaf shape types in 1982 or in 1983. In 1983, narrow leaf types had 8% more seeds per pod but 6% smaller seed. These differences tended to cancel each other resulting in the same weight of seeds per pod for both leaf types. Therefore, there was no advantage for either leaf shape type for seed yield, flavor, or hand-shelling efficiency. In both years, narrow leaf genotypes had a significantly lower leaf area index (LAI) at the vegetative stage, but not at the reproductive stage. In 1983, LAI values for broad and narrow leaf types averaged 2.42 and 2.09 respectively at growth stage V/7-V) and 5.38 and 5.00 respectively at growth stage R4-R5. The percentage difference was reduced from 14% at the vegetative stage to 7% at the reproductive stage. At R4-R%, individual leaves of broad leaf genotypes at two node positions averaged 26% larger in area, but narrow leaf genotypes averaged 2.6 (11%) more leaflets on themain stem and no difference on branches. The results suggest that the percentage reduction in leaf area differences at growth stage R4-R5 resulted from increased light penetration to lower leaves which permitted narrow leaf types to compensate for their smaller leaf area by retaining more leaves on the main stem.
Thesagro: | Fisiologia Vegetal; Glycine Max; Soja.
Thesaurus Nal: | plant physiology; soybeans.
Categoria do assunto: | --
Registro original: | Embrapa Cerrados (CPAC)
Exemplares: | CPAC - (19559-1) - ADD - TS - -- - T002/85 - PAN - T002/85 - DIS