Gas Exchange and Growth of Medicinal Plant Subjected to Salinity and Application of Biofertilizers

Sergiane Beatriz da Silva Mesquita, José Adriano da Silva, Rafael Santiago da Costa, Móises Wilkson Nunes dos Santos, Claudivan Feitosa de Lacerda, Aiala Vieira Amorim, Antonio Marcos Esmeraldo Bezerra

Universidade da Integra??o Internacional da Lusofonia Afro-Brasileira (UNILAB), Campus da Liberdade, Reden??o, Brasil.
Universidade Federal do Ceará (UFC), Fortaleza, Brasil.

DOI: 10.4236/ajps.2014.516266                

Abstract

The objective of this study was to evaluate the use of biofertilizers and saline waters on gas exchange and growth of medicinal plant Plectrantus amboinicus. The experiment was conducted in the period February to May 2013 in a greenhouse. The experimental design was completely randomized in a 2 × 4 factorial arrangement, with two levels of salinity of irrigation water (ECw: 0.7 and 3.1 dS m^-1) and four levels of bovine liquid biofertilizer applied to the soil, corresponding to 0%, 10%, 20% and 30% of the soil volume, with five replications. The experiment lasted 60 days, counted from the beginning of the treatments. The stomatal conductance (gs), photosynthesis (A), transpiration (E), intrinsic water use efficiency (WUEi) were performed at the end of the experiment, and the height, number of leaves and stem diameter at the beginning and at the end. Generally plants subjected to salinity of irrigation water of 3.1 dS m^-1 had the lowest values of gas exchange. Moreover, the application of biofertilizers and the interaction between this and salinity did not affect any growth variable studied except the stem length in the final phase which was influenced by salinity at 5% probability by F test. The average values of this variable were 57.22 cm and 69.65 cm when applied water ECw: 0.7 to 3.1 dS m^-1, respectively. The application of biofertilizers can reduce the effect of salinity on the final plant height of Plectrantus amboinicus, especially when the plants were fertilized with a dose of 20% of biofertilizers.

Keywords

Medicinal Plants, Salt Stress, Fertilizers

Conflicts of Interest

The authors declare no conflicts of interest.

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