Pre-germinative treatments applied to Chionanthus pubescens and C. virginicus seeds for sexual propagation

Mario José Añazco Romero,María Isabel Vizcaíno Pantoja,Brayan Steven Haro Mediavilla

doi:10.1590/1983-40632021v5166875

Mario José Añazco Romero, María Isabel Vizcaíno Pantoja + Show 1 more

Open Access

https://doi.org/10.1590/1983-40632021v5166875

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Abstract

ABSTRACT Chionanthus pubescens Kunth and C. virginicus seeds present double dormancy, what represents a problem for their sexual reproduction, given that it prevents them from reaching adequate germination rates. This research aimed to apply pre-germinative treatments to overcome the double dormancy in C. pubescens and C. virginicus seeds, as well as to improve both the germination speed and the amount of obtained seedlings. A completely randomized design was applied, with four treatments for each species (soaking seeds in cold water, soaking seeds in hot water, mechanical scarification and control) and three replications. For C. pubescens, the pre-germinative treatment with the best results was mechanical scarification, with a 39.22 % germinative capacity; while, for C. virginicus, the best treatment was soaking seeds in hot water (49.00 %).

Highlights

The Oleaceae family, in Ecuador, is represented by one genus (Chionanthus) and three species (C. colonchensis, C. implicatus L. and C. pubescens Kunth) (Palacios 2011).The geographical distribution of the three species occurs in four natural regions
C. colonchensis is endemic to western Ecuador, where it is found in the tropical or basal belt between 500 and 600 m above the sea level
This research aimed to apply pregerminative treatments to overcome the double dormancy of C. pubescens and C. virginicus seeds, as well as to improve their germination speed and percentage of obtained seedlings

Summary

Introduction

The Oleaceae family, in Ecuador, is represented by one genus (Chionanthus) and three species (C. colonchensis, C. implicatus L. and C. pubescens Kunth) (Palacios 2011).The geographical distribution of the three species occurs in four natural regions. The Oleaceae family, in Ecuador, is represented by one genus (Chionanthus) and three species (C. colonchensis, C. implicatus L. and C. pubescens Kunth) (Palacios 2011). C. colonchensis is endemic to western Ecuador, where it is found in the tropical or basal belt between 500 and 600 m above the sea level. C. implicatus is found in the Amazon (Fernández-Alonso & CogolloPacheco 2017). C. pubescens, native of the Andean region (Peralta 2017), is reported in Galapagos, in the city of Puerto Baquerizo Moreno (provincial capital), at 15 m above the sea level (San Cristobal Island). Found in Ecuador, C. virginicus is a species introduced from the United States of America (Chan & Marquard 1999), which has adapted to the physiographical and ecological conditions of the Andean region of this country (Ruales 2007)

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