Dormancy Breaking and the Influence of Temperature, Substrate and Light on Germination of <i>Colubrina glandulosa</i> Seeds

Lopes, Yana Souza; Chaves, Lúcia de Fatima de Carvalho; Souza, Fernanda Freitas; Pereira, Jacqueline Wanessa de Lima; Carvalho, Rejane Rodrigues da Costa e; Carvalho Filho, José Luiz Sandes de

doi:10.1590/2179-8087-FLORAM-2020-0049

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ORIGINAL ARTICLE, Silviculture • Floresta Ambient. 28 (1) • 2021 • https://doi.org/10.1590/2179-8087-FLORAM-2020-0049 copy

Dormancy Breaking and the Influence of Temperature, Substrate and Light on Germination of Colubrina glandulosa Seeds

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

This study aimed to define a methodology that, when combined with temperature, can overcome the dormancy and also to determine the adequate substrate and light conditions for germination of Colubrina glandulosa Perkins, contributing to seed analysis and restoration projects. In the experiment of dormancy and temperature, seeds were immersed in sulfuric acid for 30, 60, 90, 120 and 150 minutes and set to germinate at temperatures of 20-30 °C, 25 °C and 30 °C. The used substrates were sand, vermiculite, Tropstrato^® substrate, coconut powder, blotting paper and paper towel. As for the light supplied, the seeds were subjected to four luminosity regimes: white light, far-red light, red light and light absence. Temperatures of 20-30 °C and 30 °C achieved better results, with exposure in sulfuric acid for 120 and 150 minutes. The substrates sand and vermiculite were the most suitable. The species germinated in all light regimes treatments used.

Keywords:
seed dormancy; seed germination; ecophysiology; restoration ecology

Variables	Temperature
Variables	20-30 °C		25 °C		30 °C		CV%
GSI	1.491	A	1.271	B	1.422	A	17.32
FGC	43.8	A	37.4	B	36.2	B	21.40
SDM	0.045	B	0.055	A	0.063	A	33.25

Time in H₂SO₄	20-30 °C	25 °C	30 °C
	Mean Germination Time (days)
30’	14.2 B	11.9 B	20.08 A
60’	11.3 A	10.5 A	11.2 A
90’	8.7 A	13.2 A	9.9 A
120’	8.5 A	11.9 A	9.1 A
150’	10.1 A	12.2 A	9.9 A
	Shoot length (cm)
30’	2.0625 A	1.7667 A	1.7000 A
60’	2.7929 B	2.0232 C	4.3389 A
90’	3.1344 B	1.8069 C	4.5323 A
120’	3.2869 A	2.0246 B	2.0309 B
150’	2.7902 A	1.9413 B	1.6386 B
	Root length (cm)
30’	1.6387 A	1.6229 A	1.3833 A
60’	2.1832 A	2.1111 A	2.1516 A
90’	2.2420 B	2.0121 B	3.0556 A
120’	1.9461 A	1.8122 A	2.1240 A
150’	1.7155 A	1.9487 A	1.8673 A
	Root dry matter (mg)
30’	0.0027 A	0.0020 A	0.0025 A
60’	0.0112 B	0.0122 B	0.0245 A
90’	0.0097 B	0.0127 B	0.0370 A
120’	0.0192 A	0.0172 A	0.0210 A
150’	0.0207 A	0.0192 A	0.0167 A

Instituto de Florestas da Universidade Federal Rural do Rio de Janeiro Rodovia BR 465 Km 7, CEP 23897-000, Tel.: (21) 2682 0558 | (21) 3787-4033 - Seropédica - RJ - Brazil
E-mail: floram@ufrrj.br

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[1] CORRESPONDENCE TOYana Souza Lopes Universidade Federal Rural de Pernambuco (UFRPE), Departamento de Ciência Florestal, Rua Dom Manuel de Medeiros, s/n, CEP 52171-900, Recife, PE, Brasil e-mail: yanalopes0618@gmail.com,