Photosynthesis of Physalis peruviana under different densities of photons and saline stress

Francisco Romário Andrade Figueiredo; João Everthon da Silva Ribeiro; Jackson Silva Nóbrega; Wilma Freitas Celedônio; Reynaldo Teodoro de Fátima; Jean Telvio Andrade Ferreira; Thiago Jardelino Dias; Manoel Bandeira de Albuquerque

doi:10.14393/BJ-v37n0a2021-53948

Authors

Francisco Romário Andrade Figueiredo Universidade Federal Rural do Semi-Árido https://orcid.org/0000-0002-4506-7247
João Everthon da Silva Ribeiro Universidade Federal da Paraíba https://orcid.org/0000-0002-1937-0066
Jackson Silva Nóbrega Universidade Federal da Paraíba https://orcid.org/0000-0002-9538-163X
Wilma Freitas Celedônio Universidade Federal da Paraíba
Reynaldo Teodoro de Fátima Universidade Federal de Campina Grande
Jean Telvio Andrade Ferreira Universidade Federal de Campina Grande
Thiago Jardelino Dias Universidade Federal da Paraíba https://orcid.org/0000-0002-7843-6184
Manoel Bandeira de Albuquerque Universidade Federal da Paraíba

DOI:

https://doi.org/10.14393/BJ-v37n0a2021-53948

Keywords:

Gas exchange, Light compensation, Salinity.

Abstract

Physalis peruviana L. is a solanacea that has been gaining prominence due to its fruits presenting good acceptance in the national and international market. However, several abiotic factors, such as salinity, can cause physiological disturbances in plants, and these changes may be of greater or lesser intent according to species. Therefore, the objective of the present work was to evaluate the physiological behavior of P. peruviana submitted to different fluxes of photosynthetically active photons (PPFD) and saline stress. The experimental design was a randomized block design with three saline levels (ECw) (0.5, 2.75 and 5.00 dS m^-1) with four replications. Gas exchange measurements were performed with a portable infrared gas analyzer. Liquid CO₂ assimilation, stomatal conductance, internal CO₂ concentration, water use efficiency and instantaneous carboxylation efficiency were measured. Data were subjected to analysis of variance by F test and in cases of significance applied to regression analysis. The increase in PPFD provided reductions in stomatal conductance up to the density of approximately 400 μmol m^-2s^-1, being more pronounced in ECw of 2.75 and 5.0 dS m^-1. The maximum CO₂ assimilation rates in the three salinities are different according to the PPFD. The salinity of irrigation water reduced the quantum efficiency of photosynthesis in P. peruviana plants.

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