Ferreira, Sidney Alberto do Nascimento; Gentil, Daniel Felipe de Oliveira; Ferreira, Carlos Alberto Cid

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ARTICLE • J. Seed Sci. 43 • 2021 • https://doi.org/10.1590/2317-1545v43250757 copiar

Physiological performance of Coccoloba gigantifolia seeds subjected to desiccation and storage

Autoria SCIMAGO INSTITUTIONS RANKINGS

Resumo:

Coccoloba gigantifolia é uma espécie recentemente descrita, com área de ocorrência restrita e ameaçada de extinção, que apresenta grande potencial ornamental devido ao tamanho de suas folhas e à arquitetura da planta. Objetivou-se avaliar a viabilidade de suas sementes submetidas a diferentes teores de água e temperaturas de armazenamento, por meio de dois experimentos. No primeiro foi adotado o delineamento inteiramente casualizado (DIC), com seis tratamentos (períodos de secagem: 0, 1, 2, 3, 4 e 5 dias) e quatro repetições. No outro foi adotado o DIC, em esquema fatorial 2 (temperaturas de armazenamento: 8,0 ± 1,2 e 19,5 ± 0,7 °C) x 3 (períodos de armazenamento: 1, 2 e 4 meses), além do tratamento controle (sem armazenamento), com quatro repetições. As sementes apresentam comportamento recalcitrante, pois são sensíveis ao dessecamento, com acentuada redução da viabilidade abaixo de 19,5% de água. O armazenamento sob temperaturas de 8,0 e 19,5 °C não manteve a qualidade fisiológica das sementes, com 25,2% de água, sendo as maiores perdas registradas na temperatura de 8,0 ^oC.

Termos para indexação:
tolerância ao dessecamento; recalcitrante; conservação ex situ

Source of variation	DF	Mean square
Source of variation	DF	Emergence	ESI	MET
Linear regression	1	8,558.23^** * and **: significant at the level of 0.05 and 0.01 (p), by the F-test, respectively.	2.87^** * and **: significant at the level of 0.05 and 0.01 (p), by the F-test, respectively.	164.67^** * and **: significant at the level of 0.05 and 0.01 (p), by the F-test, respectively.
Quadratic regression	1	438.86 ^ns ns: non-significant at the 0.05 (p) level by the F test.	0.26^* * and **: significant at the level of 0.05 and 0.01 (p), by the F-test, respectively.	117.37^* * and **: significant at the level of 0.05 and 0.01 (p), by the F-test, respectively.
Cubic regression	1	3,882.76^** * and **: significant at the level of 0.05 and 0.01 (p), by the F-test, respectively.	1.60^** * and **: significant at the level of 0.05 and 0.01 (p), by the F-test, respectively.	26.49 ^ns ns: non-significant at the 0.05 (p) level by the F test.
Residual	18	103.33	0.04	15.49
CV (%)		41.49	42.68	6.82

Source of variation	DF	Mean square
Source of variation	DF	Emergence	ESI	MET
Temperature (T)	1	497.34^* * and **: significant at the level of 0.05 and 0.01 (p), by the F-test, respectively.	0.141^** * and **: significant at the level of 0.05 and 0.01 (p), by the F-test, respectively.	545.34^** * and **: significant at the level of 0.05 and 0.01 (p), by the F-test, respectively.
Period (P)	2	339.40^* * and **: significant at the level of 0.05 and 0.01 (p), by the F-test, respectively.	0.100^** * and **: significant at the level of 0.05 and 0.01 (p), by the F-test, respectively.	204.00^* * and **: significant at the level of 0.05 and 0.01 (p), by the F-test, respectively.
T x P	2	276.98^* * and **: significant at the level of 0.05 and 0.01 (p), by the F-test, respectively.	0.097^** * and **: significant at the level of 0.05 and 0.01 (p), by the F-test, respectively.	586.16^** * and **: significant at the level of 0.05 and 0.01 (p), by the F-test, respectively.
Control x Factorial Design	1	2401.44^** * and **: significant at the level of 0.05 and 0.01 (p), by the F-test, respectively.	0.358^** * and **: significant at the level of 0.05 and 0.01 (p), by the F-test, respectively.	120.00 ^ns ns: non-significant at the 0.05 (p) level by the F-test.
Residual	21	66.73	0.011	54.52
CV (%)		30.98	11.00	13.91
Average Control (%, % day^-1 and day)		56 a	1.060 a	58.1 a
Factorial Average (%, % day^-1 and day)		17 b	0.379 b	52.2 a

Storage temperature	Storage period (month)
Storage temperature	1	2	4
	Emergence (%)
8.0 ± 1.2 °C (refrigerator)	17 aA	13 aB	4 aA
19.5 ± 0.7 °C (chamber)	12 bA	39 aA	15 bA
	Emergence speed index (% day ^-1 )
8.0 ± 1.2 °C (refrigerator)	0.346 aA	0.271 aB	0.067 aA
19.5 ± 0.7 °C (chamber)	0.209 bA	1.015 aA	0.364 bA
	Mean emergence time (days)
8.0 ± 1.2 °C (refrigerator)	51.4 bA	52.9 bA	66.7 aA
19.5 ± 0.7 °C (chamber)	60.4 aA	40.1 bB	41.9 bB

ABRATES - Associação Brasileira de Tecnologia de Sementes Av. Juscelino Kubitschek, 1400 - 3° Andar, sala 31 - Centro,, CEP 86020-000 Londrina/PR - Londrina - PR - Brazil
E-mail: jss@abrates.org.br

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[1] *Corresponding author
E-mail: sanf@inpa.gov.br