Photosynthetic response of umbu trees to vapor pressure deficit

Authors

  • Sérgio Luiz Rodrigues Donato Instituto Federal de Educação, Ciência e Tecnologia Baiano, Campus Guanambi, Caixa Postal 009, Distrito de Ceraíma, CEP 46430‑000 Guanambi, BA.
  • Ednei de Souza Pires Universidade Estadual de Montes Claros, Campus de Janaúba, Caixa Postal 91, Avenida Reinaldo Viana, no 2.630, Bico da Pedra, CEP 39440-000 Janaúba, MG.
  • Alessandro de Magalhães Arantes Instituto Federal de Educação, Ciência e Tecnologia Baiano, Campus Guanambi, Caixa Postal 009, Distrito de Ceraíma, CEP 46430‑000 Guanambi, BA.
  • Beatriz Lima Barros Instituto Federal de Educação, Ciência e Tecnologia Baiano, Campus Guanambi, Caixa Postal 009, Distrito de Ceraíma, CEP 46430‑000 Guanambi, BA.

Keywords:

Spondias tuberosa, carboxylation efficiency, correlation, ecophysiology, giant umbu.

Abstract

The objective of this work was to evaluate the photosynthetic response to vapor pressure deficit (VPD) in umbu (Spondias tuberosa) tree accessions. The experiment was carried out in a completely randomized design in a 5×7×2 factorial arrangement (five umbu accessions – BRS-68, EPAMIG-05, BGU-61, BGU-75, and BGU-50 –, seven evaluation times, and two reading times – at 8 a.m. and 2 p.m.) in split-split plots in time. Leaf temperature increased with air temperature. The variation of stomatal conductance and transpiration with the VPD was not significant. Net photosynthesis rate, carboxylation efficiency, and instantaneous water‑use efficiency decreased with increasing VPD in all accessions, except in BRS‑68, whose rates remained positive.

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Published

2022-10-25

How to Cite

Donato, S. L. R., Pires, E. de S., Arantes, A. de M., & Barros, B. L. (2022). Photosynthetic response of umbu trees to vapor pressure deficit. Pesquisa Agropecuaria Brasileira, 57(Z), e02827. Retrieved from https://apct.sede.embrapa.br/pab/article/view/27144

Issue

V.57, Jan./Dec., 2022 :Continuos publication

Section

PLANT PHYSIOLOGY