Avaliação do grau de dormência das sementes de espécies de Stylosanthes Sw.
Keywords:
dormência-semente, tegumento-impermeável, leguminosa-forrageira, germinação-diferencial, reserva-sementesAbstract
A germination experiment was conducted with the objetive of determining the rate of seed dormancy of the different Stylosanthes Sw. species. The study was carried out in the following Brazilian native Stylosanthes Sw. species and varieties: S. debilis, S. guianensis var. canescens, S. guianensis var. microcephala, S. hamata, S. humilis, S. leiocarpa e S. viscosa.
References
BROLMANN, J.B. Germination studies in Stylosanthes guianensis (Aubl.) Sw. Proc. of Soil and Crop Sci. Soc. of Florida, 34: 117-118. 1975.
CAMERON, D.F. Hardseedness and seed dormancy of Townsville lucerne (Stylosanthes humilis) selections. Australian Journal of Experimental Agriculture and Animal Husbandry, 7: 237-240. 1967.
GARDENER, C.J. Mechanisms regulating germination in seeds of Stylosanthes. Australian Journal of Agricultural Research, 26: 281-294. 1975.
GRAY, S.G. Hot water treatment for Leucaena glauca (L.) Benth. Australian Journal of Experimental Agriculture and Animal Husbandry, 2: 178-180. 1962.
HADAS, A. Water uptake and germination of leguminous seeds under changing external water potencial in osmotic solutions. Journal of Experimental Botany, 27: 480-489. 1976.
HOLM, AMcR. The effect of high temperature pretreatments on germination of Townsville stylo seed material. Australian Journal of Experimental Agriculture and Animal Husbandry, 13: 190-192. 1973.
MASTROCOLA, M.A. & LIMA, M H. Efeito de baixa temperatura na quebra de dormência de sementes de cinco leguminosas forrageiras. Zootecnia, 17(3):189-200. 1979.
MAYER, AM. & POLJAKOFF-MAYBER, A. The Germination of Seeds. 2.o ed. Oxford, Pergamon Press, 1975. 192 p.
MORLEY, FH.W. The inheritance and ecological significance of seed dormancy in subterranean clover (Trifolium subterraneum L.). Australian Journal Biological Science, 11: 261-274. 1958.
OLIVEIRA, EM.P. Avaliação da variabilidade de caracteres morfológicos e agronômicos em populações de Desmodium uncinatum (Jacq.) D.C. e Desmodium intortum (Mill.) Urb. Piracicaba, ESALQ/USP, 1979. 117 p. (Tese de Doutorado).
PATERNIANI, M.L.S. & MARTINS, P.S. Variabilidade genética da dormência de sementes em populações de Stylosanthes guianensis (Aubl.) Sw. (Leguminosae-Papilionoideae). Relatório Científico, Instituto de Genética/ESALQ, Piracicaba, 13: 226-238. 1979.
PHIPPS, R.H. Methods of increasing the germination porcentage of some tropical legumes. Tropical Agriculture, 50 (4): 291-296. 1973.
QUINLIVAN, B.J. Seed coat impermeability in legumes. Journal of the Australian Institute of Agricultural Science, 37: 283-295. 1971.
ROBERTS, E.H. Dormancy: a factor affecting seed survival in the soil. In: ROBERTS, E.H. Viability of Seeds. New York, Syracuse University Press, 1972. p. 321-359.
ROLSTON, M.P. Water impermeable seed dormancy. The Botanical Review, 44 (3): 365-396. 1978.
TEIXEIRA, M.C.B. Efeito da temperatura, do potencial hidrico e do pH sobre a embebição e germinação das sementes de quatro espécies do género Stylosanthes. Viçosa, UFV, 1979. 65 p. (Tese de Mestrado).
WILLIAMS, W.A. & ELLIOTT, J.R. Ecological significance of seed coat impermeability to moisture in crimson, subterranean and rose clovers in a Mediterranean-type climate. Ecology, 41: 733-742. 1960.
YOUNG, .; EVANS, R.A.; KAY, B.L. Temperature requirements for seed germination in an annual — type rangeland community. Agronomy Journal, 65: 656-659. 1973.
