Photosynthesis of Physalis peruviana under different densities of photons and saline stress
DOI:
https://doi.org/10.14393/BJ-v37n0a2021-53948Keywords:
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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Copyright (c) 2021 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
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