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

Agronomy

LauroJosé Moreira Guimarães¹  CosmeDamião Cruz²  JheanTorres Leite³  GabrielleSousa Mafra³  KátiaFabiane Medeiros Schmitt³  DivinoRosa dos Santos Junior³  SamuelHenrique Kamphorst³  PedroHenrique Araújo Diniz Santos³  MarceloMoura Chaves³  Eliemar Campostrini³  ValterJário de Lima³  AntônioTeixeira do Amaral Júnior³ 

[1] Brazilian Agricultural Research Corporation, Embrapa Milho e Sorgo, Rod. MG 424, Km 65, Sete Lagoas MG 35701-970, Brazil;Department of General Biology, Federal University of Viçosa, Av. Peter Henry Rofs, s/n, Viçosa, Minas Gerais 36570-900, Brazil;Plant Breeding Laboratory, Agricultural Science and Technology Center, State University of North Fluminense, Av. Alberto Lamego 2000, Campos dos Goytacazes RJ 28013-602, Brazil;

关键词: drought stress;    direct effect;    spad;    path analysis;    expanded popcorn volume per hectare;   

DOI  :  10.3390/agronomy9120792

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown