Physiological performance of <i>Coccoloba gigantifolia</i> seeds subjected to desiccation and storage

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

doi:10.1590/2317-1545v43250757

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

Physiological performance of Coccoloba gigantifolia seeds subjected to desiccation and storage

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Abstract:

Coccoloba gigantifolia is recently described species, with an area of restricted occurrence and threatened with extinction, whose great ornamental potential is due to the size of its leaves and the architecture of the plant. The objective of this study was to evaluate the viability of its seeds under different water contents and storage temperatures, through two experiments. The first one used a completely randomized design (CRD) with six treatments (drying periods: 0, 1, 2, 3, 4 and 5 days) and four replications. The second experiment used a CRD in a 2 (storage temperatures: 8.0 ± 1.2 and 19.5 ± 0.7 °C) x 3 (storage periods: 1, 2 and 4 months) factorial scheme, in addition to a control treatment (without storage), with four replications. The seeds have a recalcitrant behavior, as they are sensitive to desiccation, with a marked reduction in viability with moisture content below 19.5%. Storage at temperatures of 8.0 and 19.5 °C did not maintain the physiological quality of the seeds, with 25.2% water, and the largest losses were found at a temperature of 8.0 ^oC.

Index terms:
desiccation tolerance; recalcitrant; ex situ conservation

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

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