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- Title
Estimativa da divergência entre ecótipos de braquiária baseada em descritores quantitativos e qualitativos.
- Authors
Torres, Francisco Eduardo; do Valle, Cacilda Borges; Lempp, Beatriz; do Teodoro, Paulo Eduar; Rigon, João Paulo Gonsiorkiewicz; Ribeiro, Larissa Pereira; Corrêa, Caio Cézar Guedes; da Luz Júnior, Roque Apolinário Alves
- Abstract
This study aimed to estimate the genetic divergence between Urochloa brizantha ecotypes based on quantitative, qualitative descriptors and their joint analysis to select the promising to release as cultivars of this species. Eight ecotypes (B1, B2, B3, B4, B5, B6, B8) and cultivar 'Marandu' of U. brizantha were implanted into pickets with 1000m2 each, with two repetitions. Five quantitative descriptors were evaluated [leaf area (ALF), length and width of leaf blades (CLF and LLF, respectively), dry mass (MS), mass of dry matter (MMS) and proportion of leaf blade in MS (PLF)] in two forage samples, being a representative of rainfall, in February 2000, and another in the dry period, in August 2000. It was measured the qualitative descriptors: shear strength (RC), volume of accumulated gas in fast and slow fraction (A and B, respectively), crude protein (CP), neutral detergent fiber (NDF), acid detergent fiber (ADF ), cellulose (CEL), lignin in sulfuric acid (LIG), silica (SIL) and in vitro digestibility of organic matter (IVOMD). There was considerable genetic divergence in U. brizantha ecotypes, especially regarding to quantitative descriptors. Based on the groupings of quantitative, qualitative descriptors and their joint analysis, the grouping containing of B1, B3 and B5 with 'Marandu' can result in promising U. brizantha ecotypes.
- Publication
Ciência Rural, 2015, Vol 45, Issue 3, p485
- ISSN
0103-8478
- Publication type
Article
- DOI
10.1590/0103-8478cr20140537