Preisigke Sandra C, Viana Alexandre P, Santos Eileen A, Santos Paulo Ricardo Dos, AmbrÓsio MoisÉs, Santos ValquÍria O Dos, Silva Flavia A DA
Universidade do Estado de Mato Grosso, Laboratório de Melhoramento Genético Vegetal, Av. Tancredo Neves, 1095, Cavalhada II, 78200-000 Cáceres, MT, Brazil.
Universidade Estadual do Norte Fluminense Darcy Ribeiro, Laboratório de Melhoramento Genético Vegetal, Av. Alberto Lamego, 2000, Parque Califórnia, 28013-602 Campos dos Goytacazes, RJ, Brazil.
An Acad Bras Cienc. 2020 Jun 26;92(suppl 1):e20180797. doi: 10.1590/0001-3765202020180797. eCollection 2020.
The REML/BLUP procedure has been successfully used for genetic progress through individual selection of high-yielding passion fruit genotypes resistant to the Cowpea aphid-borne mosaic virus. This study was thus developed to estimate genetic parameters and predict the gain obtained from individual selection of genotypes in a population derived from backcrosses in passion fruit. The experiment was set up as a randomized block design with four replicates, involving five full-sib families (genotypes from the first backcross). Variance components and the genetic values were estimated for eight agronomic traits via the REML/BLUP procedure. For all traits, genotypic variance between the genotypes from the first backcross showed little contribution to the phenotypic variance. The low heritability estimates obtained for the traits are overcome via individual BLUP estimates. Therefore, it was possible to obtain considerable gains with individual selection for the variables fruit length, average fruit weight, and pulp weight (19.50 to 14.04%; 22.93 to 17.97%; and 10.08 to 7.95%, respectively). For the traits showing lower gains, it is possible to obtain gains indirectly by selecting genotypes for correlated traits. Because this population derives from the first backcross generation, agronomic traits still must be recovered.
REML/BLUP程序已成功用于通过对高产且抗豇豆蚜传花叶病毒的百香果基因型进行个体选择来实现遗传进展。因此，本研究旨在估计遗传参数，并预测在百香果回交后代群体中通过个体选择基因型所获得的遗传增益。试验采用随机区组设计，重复4次，涉及5个全同胞家系（来自第一次回交的基因型）。通过REML/BLUP程序估计了8个农艺性状的方差分量和遗传值。对于所有性状，第一次回交基因型之间的基因型方差对表型方差的贡献很小。通过个体BLUP估计克服了这些性状获得的低遗传力估计值。因此，通过对果实长度、平均单果重和果肉重等变量进行个体选择，有可能获得可观的遗传增益（分别为19.50%至14.04%、22.93%至17.97%和10.08%至7.95%）。对于遗传增益较低的性状，可以通过选择与相关性状相关的基因型来间接获得增益。由于该群体来自第一次回交世代，农艺性状仍需恢复。
