Water stress and temperature on germination and vigor of Handroanthus impetiginosus (Mart. ex DC)

Tatianne R. C. Alves,Paulo C. S. Santos,Erivanessa C. Sousa,Emanoela P. Paiva,Afonso L. A. Freires,Clarisse P. Benedito

doi:10.1590/1807-1929/agriambi.v22n5p349-354

Tatianne R. C. Alves, Paulo C. S. Santos

Open Access

https://doi.org/10.1590/1807-1929/agriambi.v22n5p349-354

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Abstract

ABSTRACT Water availability and temperature are among the main abiotic factors that influence seed germination and vigor, since they act directly on biochemical and physiological processes, which result in the production of the primary root. The objective of this study was to verify the effects of stress on germination and vigor of H. impetiginosus (‘ipê-roxo’) seeds under different temperatures and osmotic agents. The experimental design was completely randomized, in a 6 x 2 factorial scheme (osmotic potentials x temperatures) with four replicates of 25 seeds for each osmotic agent. In order to simulate water stress, polyethylene glycol (PEG 6000) and mannitol solutions were used and distilled water was used as control. Osmotic potentials of 0, -0.2, -0.4, -0.6, -0.8 and -1.0 MPa were evaluated at temperatures of 25 and 30 °C, under 8 h photoperiod. The variables analyzed were: germination, germination speed index, shoot length, root length, and total dry matter of seedlings. Simulated water stress affected seed germination and seed vigor of H. impetiginosus at both temperatures and osmotic agents from -0.6 MPa.

Highlights

Handroanthus impetiginosus (Mart. ex DC) more commonly known as ‘ipê-roxo’, belonging to the Bignoniaceae family, has economic importance due to the physical-chemical features of its wood, which is appropriate to be used in civil and naval construction (Schulze et al, 2008), besides having ecological importance, being widely used for landscaping and recovery of forest ecosystems (Martins et al, 2012)
Given the relevance of this topic and the scarce information about abiotic stresses on ‘ipê-roxo’ (H. impetiginosus) seeds, the objective was to evaluate the effects of water stress on germination and vigor of seeds of this species, under different osmotic potentials and temperatures
Differently from what happened with PEG 6000, germination occurred at all potentials and at both temperatures, evidencing higher sensitivity of H. impetiginosus seeds to PEG 6000 (Figure 1B)

Summary

Introduction

Handroanthus impetiginosus (Mart. ex DC) more commonly known as ‘ipê-roxo’, belonging to the Bignoniaceae family, has economic importance due to the physical-chemical features of its wood, which is appropriate to be used in civil and naval construction (Schulze et al, 2008), besides having ecological importance, being widely used for landscaping and recovery of forest ecosystems (Martins et al, 2012). Ex DC) more commonly known as ‘ipê-roxo’, belonging to the Bignoniaceae family, has economic importance due to the physical-chemical features of its wood, which is appropriate to be used in civil and naval construction (Schulze et al, 2008), besides having ecological importance, being widely used for landscaping and recovery of forest ecosystems (Martins et al, 2012) This species occurs mostly in the Caatinga biome, where saline, sodic and waterdeficient soils occur naturally in arid and semi-arid regions (Guedes et al, 2013), and affect all aspects of germination and plant growth, causing anatomic, morphological, physiological and biochemical modifications (Bezerra et al, 2003). Some forest species have already been evaluated regarding water and thermal stresses on seed germination, such as ‘jurema-de-embira’ (Mimosa ophthalmocentra Mart. ex Benth.) (Nogueira et al, 2017), ‘catanduva’ (Piptadenia moniliformis Benth.) (Azerêdo et al, 2016) and ‘cumaru’ (Amburana cearenses Freire Allemão) (Almeida et al, 2014).

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