EFFECTS OF LIGHT AND TEMPERATURE ON SEED GERMINATION OF FICUS HISPIDA IN XISHUANGBANNA, SOUTHWEST CHINA

doi:10.3773/j.issn.1005-264x.2008.05.013

Abstract

Abstract:

Aims Ficus hispida is a common pioneer tree species in the tropical secondary forests of Xishuangbanna, China. Our objective was to determine effects of light and temperature on seed germination of F. hispida to understand its response to forest microenvironments.

Methods Our experiments were carried out in incubator with 14 h light/10 h dark treatments. Experiments to test the effects of temperature on germination were conducted at 35/25, 35/20, 30/20, 25/15 and 30 ℃ under fluorescent light. Neutral-density black plastic film was used to determine the effect of light intensity on germination at 30 ℃. Tests of the effects of R/FR ratio on germination were set at 23/20 and 30 ℃, and R/FR ratio gradients were created by filtering incandescent light through 2, 4 and 6 layers of green plastic film.

Important findings The seeds of F. hispida were photoblastic, germinating only in light. R/FR ratio significantly influenced seed germination, followed by temperature and light intensity. Germination could be induced by very low PPFD though delayed. Although the final germinations in all temperature treatments under fluorescent light were >96%, mean time to germinate differed among temperature treatments. Seed germination at 0.42 R/FR ratio was inhibited at 23/20 ℃, while much higher and earlier germination was recorded at 30 ℃. In addition, an R/FR ratio of 0.34 significantly inhibited germination at 30 ℃.

Key words: pioneer species, Ficus hispida, photoblastic, R/FR ratio, temperature

CHEN Hui, ZHANG Shuang, CAO Min. EFFECTS OF LIGHT AND TEMPERATURE ON SEED GERMINATION OF FICUS HISPIDA IN XISHUANGBANNA, SOUTHWEST CHINA[J]. Chin J Plant Ecol, 2008, 32(5): 1084-1090.

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URL: https://www.plant-ecology.com/EN/10.3773/j.issn.1005-264x.2008.05.013

https://www.plant-ecology.com/EN/Y2008/V32/I5/1084

Figures/Tables 6

References 34

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	安全灯 SL	荧光灯 FL	白炽灯 IL	2 层 2 L	4层 4 L	6 层 6 L	NS
光量子密度PPFD (μmol·m^-2·s^-1)	2.87	90	16.97	7.49	3.9	2.1	2.04
R/FR	0.05	4.56	0.67	0.52	0.42	0.34	0.58

	安全灯 SL	荧光灯 FL	白炽灯 IL	2 层 2 L	4层 4 L	6 层 6 L	NS
光量子密度PPFD (μmol·m^-2·s^-1)	2.87	90	16.97	7.49	3.9	2.1	2.04
R/FR	0.05	4.56	0.67	0.52	0.42	0.34	0.58

温度 Temperature	温度梯度 Temperature gradient	35/25 ℃	35/20 ℃	30/20 ℃	25/15 ℃	30 ℃
	MTG (d)	6.24^a± 0.04	9.56^b± 0.15	8.22^c± 0.04	8.91^d± 0.15	8.38^c± 0.15
	GS(d)	6^a± 0	9^c± 0	6.33^a± 0.33	8^b± 0	6^a± 0
光 Light	光梯度 Light gradient	白炽灯 IL	2 层 2 layers	4 层 4 layers	6 层 6 layers	中性遮荫 NS
	MTG (d)	7.49^a± 0.78	8.02^a± 0.97	12.96^b± 0.18	13.85^b± 1.66	13.37^b± 0.35
	GS (d)	6^a± 0	6^a± 0	7.33^b± 0.33	12^c± 0	11^d± 0

温度 Temperature	温度梯度 Temperature gradient	35/25 ℃	35/20 ℃	30/20 ℃	25/15 ℃	30 ℃
	MTG (d)	6.24^a± 0.04	9.56^b± 0.15	8.22^c± 0.04	8.91^d± 0.15	8.38^c± 0.15
	GS(d)	6^a± 0	9^c± 0	6.33^a± 0.33	8^b± 0	6^a± 0
光 Light	光梯度 Light gradient	白炽灯 IL	2 层 2 layers	4 层 4 layers	6 层 6 layers	中性遮荫 NS
	MTG (d)	7.49^a± 0.78	8.02^a± 0.97	12.96^b± 0.18	13.85^b± 1.66	13.37^b± 0.35
	GS (d)	6^a± 0	6^a± 0	7.33^b± 0.33	12^c± 0	11^d± 0