Seed Quality Parameters Of Three Interspecific Hybrids Of Elephant Grass X Pearl Millet [parâmetros De Qualidade De Sementes De Três Híbridos Interespecíficos De Capim Elefante X Milheto]

An interspecific hybrid resulting from the crossing of elephant grass (Pennisetum purpureum Schumach) x pearl millet (Pennisetum glaucum (L.) R. Brown) has been developed. This hybrid, however, revealed low phenotypic uniformity and low production of pure seeds. Through recurrent selection, two improved populations were obtained (genotypes Corte and Pastoreio). The aim of this study was assessing seed quality of the three hybrids (genotypes Corte, Pastoreio and Paraiso) by tests of: seed purity; seed germination; accelerated aging test, at 42 °C; 1,000 seeds weight; drying curves; and sorption and desorption isotherms. Recurrent selection altered the seed size and increased initial quality of population for genotype Pastoreio. Drying curves for the three hybrids have shown similar behavior and reached moisture contents of 2.1%, 1.9%, and 1.8%, respectively, after 63 days. The accelerated aging test showed that hybrid Pastoreio was the most vigorous.343382387Regras para análise de sementes (2009) Secretaria de Defesa Agropecuária, p. 395. , http://www.bs.cca.ufsc.br/publicacoes/regras%20analise%20sementes.pdf, BRASIL. Ministério da Agricultura, Pecuária e Abastecimento. Ministério da Agricultura, Pecuária e Abastecimento. Brasília, DF: MAPA/ ACSCavalcante Filho, F.N., Usberti, R., Thermal and moisture content effects on storability and seed dormancy releasing on Brachiaria brizantha (Hochst. Ex A. Rich.) Stapf cultivars (2008) Revista Brasileira de Sementes, 30 (3), pp. 97-105. , http://www.scielo.br/scielo.php?script=sci_arttext&pid=s0101-31222008000300013&lng=pt&nrm=isoDeresz, F., Capim-elefante manejado em sistema rotativo para produção de leite e carne (1999) Biologia e manejo do capimelefante. Juiz de Fora: Embrapa Gado de Leite, pp. 161-172. , http://www.scielo.br/scielo.php?script=sci_nlinks&ref=000078&pid=S0100-204X200500090000600005&lng=en, In: PASSOS. L.P.CARVALHO, L.A.MARTINS, C.E.BRESSAN, M.PEREIRA, A.V. (Ed.)Mohsenin, N.N., (1986) Physical properties of plants and animals materials, p. 841. , http://www.scielo.br/scielo.php?script=sci_nlinks&ref=000113&pid=S0101-2061200100010001600012&lng=en, 2. ed. Amsterdam: Gordon and Breach PublishersPereira, A.V., Valle, C.B., Ferreira, R.P., Miles, J.W., Melhoramento de forrageiras tropicais (2001) Recursos genéticos e melhoramento de plantas, p. 1183. , http://www.scielo.br/scielo.php?script=sci_nlinks&ref=000086&pid=S0100-204X200500090000600013&lng=en, In: NASS, L.L.VALOIS, A.C.C.MELO, I.S.VALADARES-INGLIS, M.C. Rondonópolis: Fundação Mato GrossoRoa, G., Rossi, S.J., Determinação experimental de curvas de teor de umidade de equilíbrio mediante a medição da umidade relativa de equilíbrio (1977) Revista Brasileira de Armazenamento, 2 (2), pp. 17-22. , http://www.scielo.br/scielo.php?script=sci_nlinks&ref=000087&pid=S0101-3122200500020000200013&lng=enSchank, S.C., Diz, D.A., Hoghe, P.J., Vann, C.V., Evaluation of pearl millet x elephant grass hybrids for use as high quality forage for livestock (1996) Soil and Crop Society of Florida Proceedings, 55, pp. 120-121. , http://www.scielo.br/scielo.php?script=sci_nlinks&ref=000115&pid=S1516-3598200900030000500011&lng=ptUsberti, R., Determinação do potencial de armazenamento de lotes de sementes de Brachiaria decumbens através do teste de envelhecimento acelerado (1990) Pesquisa Agropecuária Brasileira, 25, pp. 691-699. , http://www.scielo.br/scielo.php?script=sci_nlinks&ref=000083&pid=S1516-3598200700090000400013&lng=enXiaorong, H., Yunlan, Z., Chenglian, H., Mei, T., Shuping, C.A., Comparison of methods for drying seeds: Vacuum freeze-drier versus silica gel (1998) Seed Science Research, 8 (1), pp. 29-33. , http://www.scielo.br/scielo.php?script=sci_nlinks&ref=000091&pid=S0101-3122200500020000200017&lng=e