Phosphorus-zinc interactions in cotton: consequences for biomass production and nutrient-use efficiency in photosynthesis

dc.contributor.authorSantos, Elcio Ferreira
dc.contributor.authorPongrac, Paula
dc.contributor.authorReis, Andre Rodrigues [UNESP]
dc.contributor.authorWhite, Philip J.
dc.contributor.authorLavres, Jose
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionJozef Stefan Inst
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionJames Hutton Inst
dc.contributor.institutionKing Saud Univ
dc.description.abstractThe fragmentary information on phosphorus (P) x zinc (Zn) interactions in plants warrants further study, particularly in plants known for their high P and Zn requirements, such as cotton (Gossypium hirsutum L.). The objective of this study was to investigate the effect of P x Zn interactions in a modern cultivar of cotton grown hydroponically. Biomass, mineral nutrition and photosynthetic parameters were monitored in plants receiving contrasting combinations of P and Zn supply. Root biomass, length and surface area were similar in plants with low P and/or low Zn supply to those in plants grown with high P and high Zn supply, reflecting an increased root/shoot biomass quotient when plants lack sufficient P or Zn for growth. Increasing P supply and reducing Zn supply increased shoot P concentrations, whilst shoot Zn concentrations were influenced largely by Zn supply. A balanced P x Zn supply (4 mM P x 4 mu M Zn) enabled greatest biomass accumulation, while an imbalanced supply of these nutrients led to Zn deficiency, P toxicity or Zn toxicity. Net photosynthetic rate, stomatal conductance, transpiration rate and instantaneous carboxylation efficiency increased as P or Zn supply increased. Although increasing P supply reduced the P-use efficiency in photosynthesis (PUEP) and increasing Zn supply reduced the Zn-use efficiency in photosynthesis (ZnUEP), increasing Zn supply at a given P supply increased PUEP and increasing P supply at a given Zn supply increased ZnUEP. These results suggest that agricultural management strategies should seek for balanced mineral nutrition to optimize yields and resource-use efficiencies.en
dc.description.affiliationUniv Sao Paulo, Ctr Nucl Energy Agr, BR-13416000 Piracicaba, SP, Brazil
dc.description.affiliationJozef Stefan Inst, SI-1000 Ljubljana, Slovenia
dc.description.affiliationSao Paulo State Univ, BR-17602496 Tupa, SP, Brazil
dc.description.affiliationJames Hutton Inst, Ecol Sci Grp, Dundee DD2 5DA, Scotland
dc.description.affiliationKing Saud Univ, Distinguished Scientist Fellowship Program, Riyadh 11451, Saudi Arabia
dc.description.affiliationUnespSao Paulo State Univ, BR-17602496 Tupa, SP, Brazil
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipEuropean Union
dc.description.sponsorshipSlovenian Research Agency
dc.description.sponsorshipRural and Environment Science and Analytical Services Division (RESAS) of the Scottish Government
dc.description.sponsorshipIdEuropean Union: 623305
dc.description.sponsorshipIdSlovenian Research Agency: P1-0212
dc.description.sponsorshipIdSlovenian Research Agency: N7-077
dc.description.sponsorshipIdCNPq: 310572/2017-7
dc.description.sponsorshipIdCNPq: 309380/2017-0
dc.identifier.citationPhysiologia Plantarum. Hoboken: Wiley, v. 166, n. 4, p. 996-1007, 2019.
dc.relation.ispartofPhysiologia Plantarum
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.titlePhosphorus-zinc interactions in cotton: consequences for biomass production and nutrient-use efficiency in photosynthesisen
unesp.departmentAdministração - Tupãpt