Temperature and light under the physiological potential of seeds of Handroanthus impetiginosus

Débora da Rocha Gomes Ferreira,Jeandson Silva Viana,Edilma Pereira Gonçalves,Lidiana Nayara Ralph,Edila Maria Da Silva,Júlio Cesar de Almeida Silva

doi:10.14393/bj-v36n1a2020-42454

Débora da Rocha Gomes Ferreira, Jeandson Silva Viana + Show 4 more

Open Access

https://doi.org/10.14393/bj-v36n1a2020-42454

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Abstract

H. impetiginosus belongs to the Bignoniaceae family; it has a great potential for economic exploitation and can be used in landscaping of urban areas, reforestation, recovery of degraded areas, and folk medicine. The experiment was carried out to evaluate the effect of light and temperature regimes on the germination and vigor of Handroanthus impetiginosus seeds at the Seed Analysis Laboratory of UFRPE/UAG. The seeds were subjected to light regimes: white, far red, red, and no light at 15°C, 20°C, 25°C, 30°C, 35°C, and 40°C, using a completely randomized experimental design in a factorial scheme (4 × 6), with four repetitions of 25 seeds. The different light regimes did not influence the seed germination of H. impetiginosus. The highest germination percentage (92%) and germination speed index (7.94) were obtained at temperatures 28.2°C and 29.2°C, respectively, both under red light. The longest seedling length was also obtained from the seeds subjected to red light regime at 25°C. The temperatures of 15°C and 40°C inhibited the germination of H. impetiginosus seeds. H. impetiginosus seeds are classified as neutral photoblastics, and constant temperatures of 28.2°C and 29.2°C provided maximum germination.

Highlights

Germitest paper was used as a substrate, which was previously sterilized in an oven at 105°C for 5 h and moistened with distilled water with an amount equivalent to 2.5 times the dry weight, according to Brasil (2009)
The weight of 1000 seeds and water content will predict the seed count per kilograms and that associated with the germination percentage, we have the quantity of seeds used in the production of seedlings
No statistical differences were observed between red, distant red, and dark light regimes at 20 °C

Summary

Introduction

This species is used for furniture manufacturing, afforestation of cities, and reforestation of degraded areas, and presents pharmacological properties (SATHIYA; MUTHUCHELIAN, 2010; PETRONE; PRETI, 2010; UGBABE et al, 2010, FERRAZ; ENGEL, 2011; LOHMANN, 2012; JOSELIN et al, 2013, JIMÉNEZ-GONZÁLEZ et al, 2013). To avoid extinction and to recover the degraded areas, there has been an increasing demand for better seed quality and quantity. Knowledge regarding the conditions that aid the germination process and the production of quality and quantity seedlings for the recovery of the degraded areas and species conservation is essential (SILVA et al., 2014)

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