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- Title
Can Genetic Progress for Drought Tolerance in Popcorn Be Achieved by Indirect Selection?
- Authors
Kamphorst, Samuel Henrique; Amaral Júnior, Antônio Teixeira do; Lima, Valter Jário de; Guimarães, Lauro José Moreira; Schmitt, Kátia Fabiane Medeiros; Leite, Jhean Torres; Santos, Pedro Henrique Araújo Diniz; Chaves, Marcelo Moura; Mafra, Gabrielle Sousa; Santos Junior, Divino Rosa dos; Cruz, Cosme Damião; Campostrini, Eliemar
- Abstract
The objective of this study was to estimate the direct and indirect effects of agricultural, morphological, physiological, and root traits of popcorn lines, under two conditions of water supply: full irrigation (FI) and drought stress (DS). A complete 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 effects were performed. For the traits EPV, PRO, CTD, RA, CRV and TRV, the genotype x environment interaction was significant. Drought stress had significant effects 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.
- Subjects
DROUGHT tolerance; GENOTYPE-environment interaction; POPCORN; ANALYSIS of variance; PATH analysis (Statistics); DROUGHT management; EFFECT of herbicides on plants; SOIL fertility
- Publication
Agronomy, 2019, Vol 9, Issue 12, p792
- ISSN
2073-4395
- Publication type
Article
- DOI
10.3390/agronomy9120792