Genotypic stabilization of agronomic traits in Panicum maximum (Jacq.) hybrids

Revista Brasileira de Zootecnia

Braz, Thiago Gomes dos Santos²  Fonseca, Dilermando Miranda da³  Cruz, Cosme Damião³  Martuscello, Janaina Azevedo⁴  Jank, Liana¹ 

[1] Embrapa Gado de Corte, Campo Grande, Brasil;Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina, Brasil;Universidade Federal de Viçosa, Viçosa, Brasil;Universidade Federal de São João del-Rei, São João del-Rei, Brasil

关键词: coefficient of determination;    forage;    repeated measures;    selection efficiency;   

DOI  :  10.1590/S1806-92902015001100001

学科分类：兽医学

来源: Universidade Federal de Vicosa

【 摘 要 】

The objective of this study was to evaluate the genotypic stability of agronomic traits in hybrids of Panicum maximum. Hybrids originating from the crosses between two sexual parents and cultivars Mombasa and Tanzania were evaluated in an incomplete-block design. Evaluated traits were total dry matter, leaf dry matter, stem dry matter, percentage of leaves, and leaf:stem ratio. These traits were evaluated in six harvests. Overall, higher repeatability was observed for the traits total dry matter and leaf dry matter, especially when harvests 4, 5, and 6, occurring in spring and summer, were evaluated. The leaf dry matter was the trait that provided the greatest repeatability and determination. The repeatability of stem dry matter, percentage of leaves, and leaf:stem ratio had a low magnitude, even when the coefficient was estimated based on the harvests of better stabilization for the other variables. The hybrids achieved genotypic stabilization in the harvests made in the second rainy season. Harvests made in the rainy season provide greater repeatability and determination, and the inclusion of the dry-season harvest is detrimental to the process of selection of low-repeatability traits such as percentage of leaves.

【 授权许可】

Unknown