Dormancy Breaking in Senna Pendula (Willd.) H. S. Irwin &amp; Barneby

Josinei Rodrigues Filho,Idalina Tereza De Almeida Leite Perin,Viviana Borges Corte

doi:10.1590/2179-8087.000217

Dormancy Breaking in Senna Pendula (Willd.) H. S. Irwin & Barneby

Josinei Rodrigues Filho, Idalina Tereza De Almeida Leite Perin + Show 1 more

Open Access

https://doi.org/10.1590/2179-8087.000217

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Abstract

ABSTRACT Senna pendula seeds dormancy is caused by impermeability of the seed coat to water. In order to determine the best methodology to overcome dormancy and to perform a morphological characterization, two batches of seeds were submitted to the following treatments: a) mechanical scarification of the seed coat; b) immersion in hot water at 70 °C for 5, 10, 15 and 20 minutes; c) immersion in hot water at 90 °C for 5, 10, 15 and 20 minutes; d) sulfuric acid concentrate for 5, 10, 15 and 20 minutes; e) no treatment. The experiment was conducted in laboratory using a completely randomized design, with four replications of 25 seeds each, with daily verification for 7 days. The results showed that the use of water does not overcome the dormancy, however mechanical and chemical scarifications were the most effective treatments, with germination percentage of up to 94%.

Highlights

Senna pendula seeds dormancy is caused by impermeability of the seed coat to water
In order to determine the best methodology to overcome dormancy and to perform a morphological characterization, two batches of seeds were submitted to the following treatments: a) mechanical scarification of the seed coat; b) immersion in hot water at 70 °C for 5, 10, 15 and 20 minutes; c) immersion in hot water at 90 °C for 5, 10, 15 and 20 minutes; d) sulfuric acid concentrate for 5, 10, 15 and 20 minutes; e) no treatment
The results showed that the use of water does not overcome the dormancy, mechanical and chemical scarifications were the most effective treatments, with germination percentage of up to 94%

Summary

Introduction

Seeds originated by the sexual reproduction of plants promote genetic variability of the population, and their dispersion provides the conquest of new environments, to the extent of the success of germination. The blocking of the germination process of intact and viable seeds, even in satisfying favorable environmental conditions, is called dormancy (Goudel et al, 2013). This is evolutionarily acquired mechanism is a promising adaptation for survival of the species to harsh environments and in long term (Hilhorst, 2007). The germination impediment is very common in the botanical family Fabaceae and in species of the pioneers’ ecological group (Bewley & Black, 1994). S. Irwin and Barneby and Senna spectabilis (DC.) Irwin and Barneby (Floriano, 2004; Topanotti et al, 2014)

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