Effect of some environmental factors on seed germination of <i>Eryngium caeruleum</i> M. Bieb. populations

Rezvani, Mohammad; Zaefarian, Faezeh

doi:10.1590/0102-33062017abb0001

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Articles • Acta Bot. Bras. 31 (2) • June 2017 • https://doi.org/10.1590/0102-33062017abb0001 copy

Effect of some environmental factors on seed germination of Eryngium caeruleum M. Bieb. populations

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ABSTRACT

The effects of alternating and constant temperatures and light regimes, osmotic and salt stress and pH were tested on seed germination in four populations of Eryngium caeruleum. Laboratory experiments revealed that the four populations exhibited different responses to alternating temperature and light conditions. Alternating temperature and photoperiod had a greater positive effect on seed germination compared to complete darkness. The optimal constant temperature within 10 ºC to 15 ºC for seed germination of each population was determined in a light/dark photoperiod. Seed germination severely decreased under water stress and was completely inhibited at -0.8 MPa osmotic potential. Saline stress sharply decreased germination percentage. Germination was restricted by pH lower and higher than 5 and 8, respectively. The information obtained from this study helps to fill the gap of knowledge about seed germination requirements of E. caeruleum and enhance our understanding of this species distribution and its potential to develop in stressful and/or new habitats.

Keywords
alternating and constant temperatures; germination; light; pH; salt and osmotic stress

Populations	Coordinates	Height (m)	Rainfall (mm)	Average temperature (ºC)	Minimum temperature (ºC)	Maximum temperature (ºC)
P1	36º49’N; 53º26’E	50.02	665	16.01	-5.40	38.20
P2	36º66’N; 53º66’E	-17.2	665	16.01	-5.20	38.60
P3	36º48’N; 53º28’E	147	539.80	12.88	-5.20	38.60
P4	36º42’N; 53º36’E	1875	306.10	10.08	-15.40	35.80

Populations	Temperature (ºC)	G_max	x₅₀	G_rate	R²	Three-parametric logistic equation
	20/10	86.35	0.26	1.95	0.98	[G (%) =86.35/[1 + (x/0.26)^1.95]
P1	25/15	81.55	0.29	2.02	0.98	[G (%) =81.55/[1 + (x/0.29)^2.02]
	35/15	56.47	0.62	27.98	0.99	[G (%) =56.47/[1 + (x/0.62)^27.98]
	20/10	69.80	0.48	6.07	0.97	[G (%) =69.80/[1 + (x/0.48)^6.07]
P2	25/15	68.74	0.50	6.03	0.98	[G (%) =68.74/[1 + (x/0.50)^6.03]
	35/15	52.06	0.52	5.00	0.99	[G (%) =52.06/[1 + (x/0.52)^5.00]
	20/10	66.92	0.48	3.81	0.97	[G (%) =66.92/[1 + (x/0.48)^3.81]
P3	25/15	58.48	0.51	4.06	0.97	[G (%) =58.48/[1 + (x/0.51)^4.06]
	35/15	39.15	0.62	15.79	0.97	[G (%) =39.15/[1 + (x/0.62)^15.79]
	20/10	83.17	0.27	2.05	0.98	[G (%) =83.17/[1 + (x/0.27)^2.05]
P4	25/15	56.96	0.40	2.85	0.96	[G (%) =56.96/[1 + (x/0.40)^2.85]
	35/15	39.72	0.44	3.18	0.98	[G (%) =39.72/[1 + (x/0.44)^3.18]

Populations	Temperature (ºC)	G_max	x₅₀	G_rate	R²	Three-parametric logistic equation
	20/10	86.41	28.21	1.97	0.98	[G (%) =86.41/[1 + (x/28.21)^1.97]
P1	25/15	84.83	20.24	1.71	0.98	[G (%) =84.83/[1 + (x/20.24)^1.71]
	35/15	62.59	17.98	1.31	1	[G (%) =62.59/[1 + (x/17.98)^1.31]
	20/10	75.47	42.30	3.80	1	[G (%) =75.47/[1 + (x/42.30)^3.80]
P2	25/15	78.82	33.92	2.23	1	[G (%) =78.82/[1 + (x/33.92)^2.23]
	35/15	51.25	28.88	2.24	1	[G (%) =51.25/[1 + (x/28.88)^2.24]
	20/10	65.39	20.85	1.87	1	[G (%) =65.39/[1 + (x/20.85)^1.87]
P3	25/15	65.72	18.68	2.28	1	[G (%) =65.72/[1 + (x/18.68)^2.28]
	35/15	42.14	24.99	3.26	1	[G (%) =42.14/[1 + (x/24.99)^3.26]

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E-mail: acta@botanica.org.br

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[1] * Corresponding author: m_rezvani52@yahoo.com