Can genetic progress for drought tolerance in popcorn be achieved by indirect selection?
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. | Samuel Henrique Kamphorst, Universidade Estadual do Norte Fluminense; Antônio Teixeira do Amaral Júnior, Universidade Estadual do Norte Fluminense; Valter Jário de Lima, Universidade Estadual do Norte Fluminense; LAURO JOSE MOREIRA GUIMARAES, CNPMS; Kátia Fabiane Medeiros Schmitt, Universidade Estadual do Norte Fluminense; Jhean Torres Leite, Universidade Estadual do Norte Fluminense; Pedro Henrique Araújo Diniz Santos, Universidade Estadual do Norte Fluminense; Marcelo Moura Chaves, Universidade Estadual do Norte Fluminense; Gabrielle Sousa Mafra, Universidade Estadual do Norte Fluminense; Divino Rosa dos Santos Junior, Universidade Estadual do Norte Fluminense; Cosme Damião Cruz, Universidade Federal de Viçosa; Eliemar Campostrini, Universidade Estadual do Norte Fluminense.
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.
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