Germination of Syzygium malaccense and Syzygium jambos seeds under different thermal conditions and seedling morphology

Guilherme Nacata,Renata Aparecida De Andrade

doi:10.1590/0100-29452020645

Guilherme Nacata, Renata Aparecida De Andrade

Open Access

https://doi.org/10.1590/0100-29452020645

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Abstract

Abstract The objective of this research was to analyze the influence of temperature on seed germination and seedling morphology for the S. malaccense and . S. jambosFor germination, 250 seeds of each species, of ripe fruits, were used, which were washed in running water, dried in room condition for 24 hours and disinfected. The seeds were placed in plastic boxes with medium texture vermiculite substrate and submitted to different temperatures: 20, 25, 30, 35ºC and 20-30°C in BOD`S, in a completely randomized design. The variables analyzed were: daily germination percentage, polyembryony and GSI. For morphological characterization, 30 seeds of both each species, submitted to a temperature of 30oC and samples were collected at intervals representative of the germination. There is no influence of temperature on the germination of S. malacense seeds and for S. jambos there are losses of 35oC. The temperatures of 25 20-30 and 30oC, influence the highest percentage of polyembryony for S. malaccense, for S. jambos, only the temperature of 35oC affected this process. The temperatures of 20 and 25oC decreased the GSI, for both species. The seeds have green cotyledons, hypogeal germination with brown primary root and whitish, short and filiform secondary roots.

Highlights

Material and methodsThe genus Syzygium, belonging to the Myrtaceae family, is composed of fruit trees of tropical climate that originate from the Indomalayan region (OLIVEIRA et al, 2015)
The knowledge of the dispersal unit of a species is important for its establishment and multiplication; for the culture of Syzygium there is a lack of studies referring to the methods of propagation with practical applications, with the main route of propagation for Syzygium malaccense (L) (Meer & Perry) being in general by seeds and cutting and for Syzygium jambos (L.) Alston, the propagation by seeds is usually employed (RAYDIN et al, 2014; AGUIAR NETO, 2016; PATEL, 2016; VYAS et al, 2017; YUSNITA et al, 2017)
The experiment was performed at the Laboratory of Fruit Seeds of the Department of Plant Production of FCAV/UNESP, Campus of Jaboticabal, using seeds extracted from ripe fruits from S. malaccense and S. jambos

Summary

Introduction

Material and methodsThe genus Syzygium, belonging to the Myrtaceae family, is composed of fruit trees of tropical climate that originate from the Indomalayan region (OLIVEIRA et al, 2015). This work aims to verify the influence of temperature on seed germination, morphologically characterizing the steps of S. malaccense and S. jambos germination process.

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