Effect of accumulated temperature on seed germination—a case study of 12 Compositae species on the eastern Qinghai-Tibet Plateau of China

doi:10.3724/SP.J.1258.2011.00751

Abstract

Abstract:

Aim Temperature is an important environmental factor influencing seed germination. Our objective was to research the seed germination response of 12 Compositae species from the eastern Qinghai-Tibet Plateau of China to different temperatures using the accumulated temperature model.
Methods All 12 species belong to four genera of Compositae. Seeds of each species were germinated at five constant temperatures (5, 10, 15, 20 and 25 °C), and germination was recorded once per day. We combined the logistic function and the accumulated temperature equation and used non-linear regression to estimate the base temperature and accumulated temperature for seed germination of each species.
Important findings The average base temperature and accumulated temperature of the 12 species were 0 °C and 94.5 °C·d, respectively. The base temperature was lower and the accumulated temperature was higher than reported by previous researchers. These are the result of long-term adaptation to the temperature environment of the Qinghai-Tibet Plateau. There was a significant negative correlation between base temperature and accumulated temperature (p = 0.04). Therefore, species with lower base temperature would avoid the risk of seeds germinating earlier in an environment with changeable temperature. A significant positive correlation existed between seed mass and accumulated temperature (p = 0.01). Under relatively constant base temperature, small-seeded species germinated faster than large-seeded ones, giving them priority of germination in early succession.

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Key words: accumulated temperature, base temperature, Compositae, seed germination, seed mass, Qinghai- Tibet Plateau

LIU Wen, LIU Kun, ZHANG Chun-Hui, DU Guo-Zhen. Effect of accumulated temperature on seed germination—a case study of 12 Compositae species on the eastern Qinghai-Tibet Plateau of China[J]. Chin J Plant Ecol, 2011, 35(7): 751-758.

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Figures/Tables 5

References 33

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物种名 Name of species	千粒重±标准误差 Thousand-grain weight ± SE (g)
长毛风毛菊 Saussurea hieracioides	1.614 9 ± 0.092 0
大耳叶风毛菊 Saussurea macrota	1.766 3 ± 0.052 4
甘肃风毛菊 Saussurea kansuensis	2.546 6 ± 0.093 5
火绒草 Leontopodium leontopodioides	0.109 1 ± 0.011 3
戟叶火绒草 Leontopodium dedekensii	0.077 4 ± 0.002 0
银叶火绒草 Leontopodium souliei	0.077 2 ± 0.002 2
异羽千里光 Senecio diversipinnus	0.515 8 ± 0.026 3
额河千里光 Senecio argunensis	0.776 7 ± 0.011 4
密齿千里光 Senecio densiserratus	0.556 7 ± 0.009 9
淡黄香青 Anaphalis flavescens	0.071 0 ± 0.000 6
黄腺香青 Anaphalis aureo-punctata	0.077 6 ± 0.001 0
尼泊尔香青 Anaphalis nepalensis	0.255 0 ± 0.001 7

物种名 Name of species	千粒重±标准误差 Thousand-grain weight ± SE (g)
长毛风毛菊 Saussurea hieracioides	1.614 9 ± 0.092 0
大耳叶风毛菊 Saussurea macrota	1.766 3 ± 0.052 4
甘肃风毛菊 Saussurea kansuensis	2.546 6 ± 0.093 5
火绒草 Leontopodium leontopodioides	0.109 1 ± 0.011 3
戟叶火绒草 Leontopodium dedekensii	0.077 4 ± 0.002 0
银叶火绒草 Leontopodium souliei	0.077 2 ± 0.002 2
异羽千里光 Senecio diversipinnus	0.515 8 ± 0.026 3
额河千里光 Senecio argunensis	0.776 7 ± 0.011 4
密齿千里光 Senecio densiserratus	0.556 7 ± 0.009 9
淡黄香青 Anaphalis flavescens	0.071 0 ± 0.000 6
黄腺香青 Anaphalis aureo-punctata	0.077 6 ± 0.001 0
尼泊尔香青 Anaphalis nepalensis	0.255 0 ± 0.001 7

物种名 Name of species	$m\pm SE$	$k\pm SE$	$b\pm SE$	${{T}_{b}}\pm SE$(℃)	${{\theta }_{T}}\left( 50\% \right)$(℃·d)	${{R}^{2}}$
长毛风毛菊 Saussurea hieracioides	0.791 ± 0.023	0.094 ± 0.021	8.936 ± 2.003	-0.361 ± 0.493	100.79	0.94
大耳叶风毛菊 Saussurea macrota	0.642 ± 0.019	0.067 ± 0.015	6.791 ± 1.351	-0.231 ± 0.573	119.62	0.92
甘肃风毛菊 Saussurea kansuensis	0.587 ±0.015	0.090 ± 0.015	7.615 ± 1.137	-0.007 ± 0.317	104.46	0.96
火绒草 Leontopodium leontopodioides	0.878 ± 0.020	0.105 ± 0.022	7.865 ± 1.504	-1.041 ± 0.467	77.72	0.95
戟叶火绒草 Leontopodium dedekensii	0.767 ± 0.017	0.106 ± 0.017	7.383 ± 1.133	0.939 ± 0.246	75.37	0.96
银叶火绒草 Leontopodium souliei	0.881 ± 0.025	0.073 ± 0.016	6.229 ± 1.314	0.792 ± 0.438	88.98	0.94
异羽千里光 Senecio diversipinnus	0.698 ± 0.011	0.082 ± 0.010	8.543 ± 0.989	-1.380 ± 0.362	115.32	0.99
额河千里光 Senecio argunensis	0.884 ± 0.027	0.095 ± 0.021	8.161 ± 1.725	0.455 ± 0.382	89.00	0.94
密齿千里光 Senecio densiserratus	0.842 ± 0.027	0.100 ± 0.019	8.589 ± 1.519	0.773 ± 0.269	89.82	0.94
淡黄香青 Anaphalis flavescens	0.892 ± 0.012	0.121 ± 0.013	8.640 ± 0.897	1.452 ± 0.119	73.42	0.98
黄腺香青 Anaphalis aureo-punctata	0.849 ± 0.016	0.070 ± 0.009	6.284 ± 0.762	-0.320 ± 0.394	94.66	0.97
尼泊尔香青 Anaphalis nepalensis	0.890 ± 0.031	0.081 ± 0.022	8.250 ± 2.154	-0.762 ± 0.548	104.59	0.92

物种名 Name of species	$m\pm SE$	$k\pm SE$	$b\pm SE$	${{T}_{b}}\pm SE$(℃)	${{\theta }_{T}}\left( 50\% \right)$(℃·d)	${{R}^{2}}$
长毛风毛菊 Saussurea hieracioides	0.791 ± 0.023	0.094 ± 0.021	8.936 ± 2.003	-0.361 ± 0.493	100.79	0.94
大耳叶风毛菊 Saussurea macrota	0.642 ± 0.019	0.067 ± 0.015	6.791 ± 1.351	-0.231 ± 0.573	119.62	0.92
甘肃风毛菊 Saussurea kansuensis	0.587 ±0.015	0.090 ± 0.015	7.615 ± 1.137	-0.007 ± 0.317	104.46	0.96
火绒草 Leontopodium leontopodioides	0.878 ± 0.020	0.105 ± 0.022	7.865 ± 1.504	-1.041 ± 0.467	77.72	0.95
戟叶火绒草 Leontopodium dedekensii	0.767 ± 0.017	0.106 ± 0.017	7.383 ± 1.133	0.939 ± 0.246	75.37	0.96
银叶火绒草 Leontopodium souliei	0.881 ± 0.025	0.073 ± 0.016	6.229 ± 1.314	0.792 ± 0.438	88.98	0.94
异羽千里光 Senecio diversipinnus	0.698 ± 0.011	0.082 ± 0.010	8.543 ± 0.989	-1.380 ± 0.362	115.32	0.99
额河千里光 Senecio argunensis	0.884 ± 0.027	0.095 ± 0.021	8.161 ± 1.725	0.455 ± 0.382	89.00	0.94
密齿千里光 Senecio densiserratus	0.842 ± 0.027	0.100 ± 0.019	8.589 ± 1.519	0.773 ± 0.269	89.82	0.94
淡黄香青 Anaphalis flavescens	0.892 ± 0.012	0.121 ± 0.013	8.640 ± 0.897	1.452 ± 0.119	73.42	0.98
黄腺香青 Anaphalis aureo-punctata	0.849 ± 0.016	0.070 ± 0.009	6.284 ± 0.762	-0.320 ± 0.394	94.66	0.97
尼泊尔香青 Anaphalis nepalensis	0.890 ± 0.031	0.081 ± 0.022	8.250 ± 2.154	-0.762 ± 0.548	104.59	0.92