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dc.contributor.authorKamphorst, Samuel Henrique
dc.contributor.authorAmaral Júnior, Antônio Teixeira do
dc.contributor.authorde Lima, Valter Jário
dc.contributor.authorSantos, Pedro Henrique Araújo Diniz
dc.contributor.authorRodrigues, Weverton Pereira
dc.contributor.authorVivas, Janieli Maganha Silva
dc.contributor.authorGonçalves, Gabriel Moreno Bernardo
dc.contributor.authorSchmitt, Katia Fabiane Medeiros
dc.contributor.authorLeite, Jhean Torres
dc.contributor.authorVivas, Marcelo
dc.contributor.authorMora-Poblete, Freddy
dc.contributor.authorVergara-Diaz, Omar
dc.contributor.authorAraus Ortega, José Luis
dc.contributor.authorRamalho, José Cochicho
dc.contributor.authorCampostrini, Eliemar
dc.description.abstractClimate change is expected to intensify water restriction to crops, impacting on the yield potential of crops such as popcorn. This work aimed to evaluate the performance of 10 field cultivated popcorn inbred lines during two growing seasons, under well-watered (WW) and water stressed (WS) (ψsoil≥ −1.5 MPa) conditions. Water stress was applied by withholding irrigation in the phenological phase of male pre-anthesis. Additionally, two contrasting inbred lines, P7 (superior line) and L75 (low performer) were compared for grain yield (GY) and expanded popcorn volume (EPV), selected from previous studies, were tested under greenhouse conditions. In the field, no genotype x water condition x crop season (G×WC×CS) interaction was observed, whereas GY (−51%), EPV (−55%) and leaf greenness (SPAD index) measured 17 days after anthesis (DAA) (> −10%) were highly affected by water limitation. In general, root traits (angles, number, and density) presented G×WC×CS interaction, which did not support their use as selection parameters. In relation to leaf senescence, for both WS and WW conditions, the superior inbred lines maintained a stay-green condition (higher SPAD index) until physiological maturity, but maximum SPAD index values were observed later in WW (48.7 by 14 DAA) than in WS (43.9 by 7 DAA). Under both water conditions, negative associations were observed between SPAD index values 15 and 8 days before anthesis DBA), and GY and EPV (r ≥ −0.69), as well as between SPAD index 7, 17, and 22 DAA, and angles of brace root (AB), number of crown roots (NC) and crown root density (CD), in WS (r ≥ −0.69), and AB and CD, in WW (r ≥ −0.70). Lower NC and CD values may allow further root deepening in WS conditions. Under WS P7 maintained higher net photosynthesis values, stomatal conductance, and transpiration, than L75. Additionally, L75 exhibited a lower (i.e., more negative) carbon isotope composition value than P7 under WS, confirming a lower stomatal aperture in L75. In summary, besides leaf greenness, traits related to leaf photosynthetic status, and stomatal conductance were shown to be good indicators of the agronomic performance of popcorn under water constraint.ca_ES
dc.description.sponsorshipThis study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – Brasil (CAPES) – Finance Code 001. Funding was also provided by FAPERJ, with the project E26/201.813/2017 to SK and E26/202.761/2017 to AA. Funding to JR by Fundação para a Ciência e a Tecnologia (FCT), Portugal, through the research units UID/UIDB/00239/2020 (CEF), and UIDP/04035/2020 (GeoBioTec) is also greatly acknowledged. JA acknowledges the support of Catalan Institution for Research and Advanced Studies (ICREA, Generalitat de Catalunya, Spain), through the ICREA Academia Program.ca_ES
dc.publisherFrontiers Mediaca_ES
dc.relation.isformatofReproducció del document publicat a:
dc.relation.ispartofFrontiers in Plant Science, 2020, vol. 11, article 1289ca_ES
dc.rightscc-by, (c) Kamphorst, Samuel Henrique et al., 2020ca_ES
dc.subjectCarbon isotope compositionca_ES
dc.subjectLeaf gas exchangesca_ES
dc.subjectPopcorn yieldca_ES
dc.subjectWater use efficiencyca_ES
dc.titleComparison of Selection Traits for Effective Popcorn (Zea mays L. var. Everta) Breeding Under Water Limiting Conditionsca_ES

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cc-by, (c) Kamphorst, Samuel Henrique et al., 2020
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