Genetic gains in physic nut using selection indexes

• Autor(a) principal: Bhering, Leonardo Lopes
• Data de Publicação: 2012
• Outros Autores: Laviola, Bruno Galveas, Salgado, Caio Césio, Sanches, Carlos Felipe Barrera, Rosado, Tatiana Barbosa, Alves, Alexandre Alonso
• Tipo de documento: Artigo
• Idioma: eng; por
• Título da fonte: Pesquisa Agropecuária Brasileira (Online)
• Texto Completo: https://seer.sct.embrapa.br/index.php/pab/article/view/11661
• topic: Jatropha curcas; biodiesel; canopy volume; Cerrado; juvenility; seed size; Jatropha curcas; biodiesel; volume de copa; Cerrado; juvenilidade; tamanho de sementes

The objective of this work was to estimate genetic gains in physic nut (Jatropha curcas) using selection indexes and to establish the best selection strategy for the species. Direct and indirect selection was carried out using different selection indexes, totalizing 14 strategies. One hundred and seventy five families from the active germplasm bank of Embrapa Agroenergy, Brasília, Brazil, were analyzed in a randomized complete block design with two replicates. The evaluated traits were: grain yield; seeds per fruit; endosperm/ seed ratio; seed weight, length, width, and thickness; branches per plant at 0.5, 1.0, and 1.5 m; plant height; stem diameter; canopy projection on rows and between lines; canopy volume; juvenility (days to the first flowering); and height of the first inflorescence. Evaluations were done during the second year of cultivation. The use of selection indexes is relevant to maximize the genetic gains in physic nut, favoring a better distribution ofdesirable traits. The multiplicative and restrictive indexes are considered the most promising for selection.