Title:	Selection of alfafa cultivars adapted for tropical environments with repeated measures using PROC MIXED of SAS system.
Authors:	ASSIS, G. M. L. de RUGGIERI, A. C. MERCADANTE, M. E. Z. CAMARGO, G. M. F. de CARNEIRO JUNIOR, J. M.
Affiliation:	GISELLE MARIANO LESSA DE ASSIS, CPAF-AC; UNESP; Instituto de Ciência Animal, SP; UNESP; JOSE MARQUES CARNEIRO JUNIOR, CPAF-AC.
Date Issued:	2009
Citation:	Plant Genetic Resources, United Kingdom, v. 8, n.1, p. 55-62, Apr. 2009.
Description:	Although alfalfa (Medicago sativa L.) is a leguminous herbage widely used in temperate regions as animal feed, there is not much research in tropical regions to develop cultivars adapted to these environmental conditions. The utilization of adapted cultivars with adequate management practices is important to improve productivity, quality and persistence of cultivated pastures. The objectives of this study were to verify the genetic variability among alfalfa cultivars and to rank them using mixed model methodology. A total of 35 alfalfa cultivars were evaluated in the rainy and dry seasons, from 1996 to 2000, in plots of 2.8 m2 in Sertãozinho, São Paulo, Brazil. The experimental design was a randomized complete block with three replications. Longitudinal data of dry matter yield were analyzed using PROC MIXED of SAS® System. Several covariance structures were tested and the spherical spatial structure was selected. The results show that the genetic variability was statistically significant only for the dry season. Moreover, the interaction among cultivars and harvests variance was highly significant for both seasons. The empirical best linear unbiased predictions of cultivar effects were obtained, allowing for the selection of the superior cultivars MH 15, 5715, SW 8210, Rio, High, 5888, Monarca, Victoria, Florida 77 and Falcon. Crioula, the most common cultivar in Brazil, showed low forage potential in Sertãozinho. Results indicate potential for use of more productive cultivars of alfalfa to produce animal feed in tropical environments.
Thesagro:	Melhoramento genético vegetal Leguminosa forrageira Alfafa Medicago sativa Variação genética Variedade resistente Clima tropical Método estatístico
NAL Thesaurus:	Alfalfa Plant breeding Forage legumes Genetic variation Tropics Statistical analysis
Keywords:	PROC MIXED SAS system Anális estatística Análisis estadístico Fitomejoramiento Leguminosas forrajeras Trópicos Variación genética
ISSN:	1479-2621 (impresso)
DOI:	10.1017/S1479262109990153.
Type of Material:	Artigo de periódico
Access:	openAccess
Appears in Collections:	Artigo em periódico indexado (CPAF-AC)