Absorption Curve and Germination of Jucá Seeds under Different Salts

Danielle Marie Macedo Sousa,Elis Regina Costa De Morais,Celsemy Eleutério Maia

doi:10.5539/jas.v8n7p112

Abstract

The plants are subjected to conditions of multiple stresses that limit their growth and development, which affects their chances of survival wherever they grow. To evaluate the plant tolerance to these conditions, one of the most used methods is the observation of seed germination under salt stress. The action of salts on the seeds varies widely among species and can exert toxic effects, causing damage before and/or after the onset of germination. Therefore, the objective of this work was to evaluate the influence of different salts in water absorption and germination in jucá seeds (Libidibia ferrea). For absorption and germination curve, were used non-scarified and scarified seeds, and subjected to the treatments in distilled water (control) and NaCl solutions, KCl, CaCl2 and K2HPO4, in an electric conductivity of 5 dS m-1. The saline solution composed by K2HPO4 influence on water absorption of L. ferrea in intact seeds. The scarified and non-scarified seeds of L. ferrea have different times for the physiological phases of water absorption. The action of salts in the germination and vigor in non-scarified and scarified seeds, does not significantly reduce these values due to electrical conductivity of 5 dS m-1 not be enough to affect the seed germination of L. ferrea.

Highlights

The plants are subjected to conditions of multiple stresses that limit their growth and development, which affects their chances of survival wherever they grow. Larcher (2000), states that one of the most widespread methods for determining the tolerance of plants to water and salt stress is observing the germination of seeds in these conditions
The saline solution composed by K2HPO4 influence on water absorption of L. ferrea in intact seeds
From the values of the adjusted parameters, it was observed that the mathematical model used satisfactorily estimated water absorption of the seeds as a function of time for all treatments with high coefficients of determination, both intact seeds as for scarified within the different solutions evaluated (Table 1)

Summary

Introduction

The plants are subjected to conditions of multiple stresses that limit their growth and development, which affects their chances of survival wherever they grow. Larcher (2000), states that one of the most widespread methods for determining the tolerance of plants to water and salt stress is observing the germination of seeds in these conditions. The plants are subjected to conditions of multiple stresses that limit their growth and development, which affects their chances of survival wherever they grow. Larcher (2000), states that one of the most widespread methods for determining the tolerance of plants to water and salt stress is observing the germination of seeds in these conditions. Germination is an early stage of plant development in which the seed must have internal and external conditions favorable for both. Temperature, salinity, light, water, oxygen concentration and alkalinity are one of the main environmental factors that may influence the germination of seeds. Saline soils have various types of soluble salts, each of which has different effects on initial plant growth (Tobe et al, 2003), and its composition in soils will differ widely between locations (Tobe et al, 2004). Excessive soluble salts in soils, such as sulphates, bicarbonates, borates and especially sodium chloride, will interfere in the water potential of the soil, reducing the potential gradient between the soil and the seed surface, which causes a restriction in the water inlet embryo (Macedo & Lopes, 2008)

Objectives

Methods

Results

Conclusion