Photosynthetic response of umbu trees to vapor pressure deficit

Donato, Sérgio Luiz Rodrigues; Pires, Ednei de Souza; Arantes, Alessandro de Magalhães; Barros, Beatriz Lima

doi:10.1590/S1678-3921.pab2022.v57.02827

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Plant Physiology, Original Article • Pesq. agropec. bras. 57 • 2022 • https://doi.org/10.1590/S1678-3921.pab2022.v57.02827 copy

Photosynthetic response of umbu trees to vapor pressure deficit

Resposta fotossintética de umbuzeiro ao deficit de pressão de vapor

Authorship SCIMAGO INSTITUTIONS RANKINGS

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.

Index terms:
Spondias tuberosa ; carboxylation efficiency; correlation; ecophysiology; giant umbu

Accession	Correlation	Correlation coefcient
Leaf temperature - T_leaf (ºC) and air temperature - T_air (ºC)
BRS-68	T̂_Leaf = 16.16521 + 0.75475Tair	0.575*
EPAMIG-05	T̂_Leaf = 22.37378 + 0.57752Tair	0.498*
BGU-61	T̂_Leaf = 17.30569 + 0.79967Tair	0.601*
BGU-75	T̂_Leaf = 18.52477 + 0.75895Tair	0.598*
BGU-50	T̂_Leaf = 22.51507 + 0.61661Tair	0.506*
Photosynthesis rate - A (µmol CO₂ m^-2 s^-1) and vapor pressure deficit - VPD (kPa)
BRS-68	Â=13.9 95 01-4.22483VPD	-0.701*
EPAMIG-05	Â=16.62090-6.65729VPD	-0.746**
BGU-61	Â=13.98097-5.661821VPD	-0.568*
BGU-75	Â=14.99233-6.01194VPD	-0.657**
BGU-50	Â=15.70150-6.56296VPD	-0.595*
Carboxylation efciency – A/C_i (μmol CO₂ m^-2 s^-1/μmol CO₂ mol^-1)
BRS-68	$\overset{⌢}{A / C_{i}} = 0.01546 - 0.01546 VPD$	-0.702**
EPAMIG-05	$\overset{⌢}{A / C_{i}} = 0.06046 - 0.02426 VPD$	-0.738**
BGU-61	$\overset{⌢}{A / C_{i}} = 0.04673 - 0.01846 VPD$	-0.571*
BGU-75	$\overset{⌢}{A / C_{i}} = 0.04981 - 0.01957 VPD$	-0.662*
BGU-50	$\overset{⌢}{A / C_{i}} = 0.05203 - 0.02046 VPD$	-0.601*
Water-use efciency – WUE (μmol CO₂ m^-2 s^-1/mmol H₂O m^-2 s^-1) and vapor pressure deficit - VPD (kPa)
BRS-68	$\overset{⌢}{WUE} = 3.44816 - 0.89762 VPD$	-0.514*
EPAMIG-05	$\overset{⌢}{WUE} = 2.86952 - 0.85643 VPD$	-0.698**
BGU-61	$\overset{⌢}{WUE} = 3.45356 - 1.94132 VPD$	-0.682**
BGU-75	$\overset{⌢}{WUE} = 2.74730 - 1.23844 VPD$	-0.685**
BGU-50	$\overset{⌢}{WUE} = 2.73392 - 1.14338 VPD$	-0.723**

Accession	Correlation	Correlation coefficient
Stomatal conductance - g_s (mol H₂O m^-2 s^-1) and vapor pressure deficit - VPD (kPa)
BRS-68	ĝ_s=0.27139-0.03974VPD	-0.175^ns
EPAMIG-05	ĝ_s=0.31537-0.03039VPD	-0.087^ns
BGU-61	ĝ_s=0.30731+0.033305VPD	0.055^ns
BGU-75	ĝ_s=0.57797-0.18292VPD	-0.406*
BGU-50	ĝ_s=0.43151-0.07171VPD	-0.154^ns
Transpiration rate – E (mmol H₂O m^-2 s^-1) and vapor pressure deficit -VPD (kPa)
BRS-68	Ê=3.94119+0.63071VPD	0.118^ns
EPAMIG-05	Ê=4.53666+0.78644VPD	0.101^ns
BGU-61	Ê=4.86618+0.88778VPD	0.105^ns
BGU-75	Ê=6.91645-0.63685VPD	-0.088^ns
BGU-50	Ê=6.29799+0.17067VPD	0.023^ns

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[1] Corresponding author ednei.agro@hotmail.com