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Open AccessArticle

Can Genetic Progress for Drought Tolerance in Popcorn Be Achieved by Indirect Selection?

1
Plant Breeding Laboratory, Agricultural Science and Technology Center, State University of North Fluminense, Av. Alberto Lamego 2000, Campos dos Goytacazes RJ 28013-602, Brazil
2
Brazilian Agricultural Research Corporation, Embrapa Milho e Sorgo, Rod. MG 424, Km 65, Sete Lagoas MG 35701-970, Brazil
3
Department of General Biology, Federal University of Viçosa, Av. Peter Henry Rofs, s/n, Viçosa, Minas Gerais 36570-900, Brazil
*
Author to whom correspondence should be addressed.
Agronomy 2019, 9(12), 792; https://doi.org/10.3390/agronomy9120792
Received: 21 October 2019 / Revised: 9 November 2019 / Accepted: 20 November 2019 / Published: 22 November 2019
(This article belongs to the Section Crop Breeding and Genetics)
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. View Full-Text
Keywords: drought stress; direct effect; spad; path analysis; expanded popcorn volume per hectare drought stress; direct effect; spad; path analysis; expanded popcorn volume per hectare
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Kamphorst, S.H.; Amaral Júnior, A.T.; Lima, V.J.; Guimarães, L.J.M.; Schmitt, K.F.M.; Leite, J.T.; Santos, P.H.A.D.; Chaves, M.M.; Mafra, G.S.; Santos Junior, D.R.; Cruz, C.D.; Campostrini, E. Can Genetic Progress for Drought Tolerance in Popcorn Be Achieved by Indirect Selection? Agronomy 2019, 9, 792.

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