Author(s): KAMPHORST, S. H.; 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.

Summary: 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.

Publication year: 2019

Types of publication: Journal article

Unit: Embrapa Maize & Sorghum

Keywords: Genética Vegetal, Milho Pipoca, Resistência a Seca, Seleção indireta, Tolerância a seca