Can genetic progress for drought tolerance in popcorn be achieved by indirect selection?

• Autor(a) principal: KAMPHORST, S. H.
• Data de Publicação: 2019
• Outros Autores: AMARAL JÚNIOR, A. T. do, LIMA, V. J. de, GUIMARAES, L. J. M., SCHMITT, K. F. M., LEITE, J. T., SANTOS, P. H. A. D., CHAVES, M. M., MAFRA, G. S., SANTOS JÚNIOR, D. R. dos, CRUZ, C. D., CAMPOSTRINI, E.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
• Texto Completo: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1121628
• topic: Tolerância a seca; Seleção indireta; Milho Pipoca; Resistência a Seca; Genética Vegetal

The objective of this study was to estimate the direct and indirect eects of agricultural, morphological, physiological, and root traits of popcorn lines, under two conditions of water supply: full irrigation (FI) and drought stress (DS).Acomplete randomized block design with three replications was used to evaluate the following traits: expanded popcorn volume per hectare (EPV), 100-grain weight (100GW), mean ear length, mean ear diameter, number of grains per row (NGR), prolificacy (PRO), anthesis to silking interval, tassel length, number of tassel branches, plant height, shoot dry matter, green index (SPAD), and canopy temperature depression (CTD), root angle (RA), tap root volume (TRV), and crown root volume (CRV). Analyses of variance and path analysis, and subsequent partitioning of direct and indirect eects were performed. For the traits EPV, PRO, CTD, RA, CRV and TRV, the genotype x environment interaction was significant. Drought stress had significant eects on EPV (􀀀7.15%), 100GW (􀀀23.52%), SPAD (􀀀29.31%), CTD (87.15%), RA (24.54%), and CRV (44.89%). The traits NGR and SPAD were found to be decisive for the expression of EPV. The exploitation of these traits by indirect selection is expected to induce increments in EPV in environments under DS and FI.