Storage and germination of seeds of Handroanthus heptaphyllus (Mart.) Mattos

Thaíse Da Silva Tonetto,Marlove Fátima Brião Muniz,Álvaro Luís Pasquetti Berghetti,Maristela Machado Araujo,Clair Walker

doi:10.1590/2317-1545v37n1141116

Thaíse Da Silva Tonetto, Marlove Fátima Brião Muniz + Show 3 more

Open Access

https://doi.org/10.1590/2317-1545v37n1141116

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Abstract

The aim of this study was to determine the substrate and the most suitable sowing method for germination, as well as the environment for storage of Handroanthus heptaphyllus seeds (ipê-roxo), and infer the health quality provided by different packaging. Experiment 1 has assessed the treatments (substrates - blotting paper, filter paper, vermiculite, sand, besides paper roll; and sowing methods - among and on the substrates). Experiment 2 has assessed storage in three environments (air conditioned room - 18 °C and 49% of relative humidity (RH); cold and wet chamber - 8 °C and 80% RH; and dry and cold chamber - 7.5 ºC and 55% RH) , for 300 days. Handroanthus heptaphyllus seed germination test can be performed using seeding among blotting paper, vermiculite, on sand, between sand, on vermiculite and between filter paper. The storage of the seeds in plastic bags kept in an air conditioned room and/or in a dry and cold chamber is suitable for the preservation of Handroanthus heptaphyllus seeds for a period of 300 days. The packaging in a dry and cold chamber environment has provided a lower incidence of fungi associated with the Handroanthus heptaphyllus seeds.

Highlights

The need for maintenance and conservation of native forest species has become evident given the intense social and scientific concern for recovering degraded areas
In the germination test (G%) the highest values were obtained in the treatment between blotting paper (BBP), between vermiculite (BV), on sand (OS), between sand (BS), on vermiculite (OV) and between filter paper (BFP) (Table 1)
The seed water content (WC) obtained at time zero and after storage, associated with the germination result, suggests that the seeds of Handroanthus heptaphyllus do not show a typical behavior of recalcitrant seeds, nor orthodox ones, and this study has found that the species mentioned has an intermediate trend between both classifications in relation to desiccation

Summary

Introduction

The need for maintenance and conservation of native forest species has become evident given the intense social and scientific concern for recovering degraded areas. The characteristics of the seeds should be assessed by physical, physiological and health tests in order to prove the quality of the lot, as well as provide information on which to base the seeds sowing and preservation. The procedures for such tests are described in the Regras para Análise de Sementes (Rules for Seed Analysis) (Brasil, 2009a; 2009b) and Instruções para Análises de Sementes de Espécies Florestais (Instructions for Analyses of Forest Species Seeds) (Brasil, 2013). Knowing which substrate provides a suitable seed germination is needed, since it varies depending on the species, compromising the analysis result on the quality of the seeds. Brasil (2013) suggests the paper roll substrate for Handroanthus heptaphyllus

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