Thermal time model analysis for seed germination of four Vicia species

doi:10.3724/SP.J.1258.2012.00841

Abstract

Abstract:

Aims The study aimed to: 1) investigate the accuracy of thermal time model in predicating seed germination response to temperature for different legume species after dormancy release; 2) compare temperature requirements for seed germination of different legume species from the Qingzang Gaoyuan.
Methods The seeds of four Vicia species were germinated over the constant temperature range of 5-30 °C at 5 °C interval. The effects of temperature on seed germination were summarized in terms of the thermal time model for germination.
Important findings The base temperature (T_b) did not differ significantly within each sub-population by regressing germination rate on sub-optimal temperatures. In contrast with T_b, the ceiling temperature (T_c) differed significantly within each sub-population by regressing germination rate on supra-optimal temperature in all species except Vicia sativa. These imply the base temperature for all individual seeds in the populations were relative constant, but the ceiling temperatures may vary within the sub-populations. T_b value estimated by repeated probit analysis was quite close to the value estimated by regressing germination rate within sub-optimal temperatures; however, T_c value estimated by this method was close to the value estimated with T₅₀. Compared to two perennial legume species, annual legume species had lower T_b and T_c. The thermal model was accurate to predict the germination time course under different temperatures.

Key words: Leguminosae, seed germination, temperature, thermal time model

HU Xiao-Wen, WANG Juan, WANG Yan-Rong. Thermal time model analysis for seed germination of four Vicia species[J]. Chin J Plant Ecol, 2012, 36(8): 841-848.

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https://www.plant-ecology.com/EN/Y2012/V36/I8/841

Figures/Tables 5

References 23

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种名 Species	采收时间 Harvest time	产地 Collection site	生活型 Life form	硬实率 Hardseededness (%)	千粒重 1 000 seeds weight (g)
窄叶野豌豆 Vicia angustifolia	2010	甘肃夏河 Xiahe, Gansu	一年或两年生 Annual or biennial	91	20.5
山野豌豆 V. amoena	2011	甘肃夏河 Xiahe, Gansu	多年生 Perennial	90	20.3
歪头菜 V. unijuga	2010	甘肃夏河 Xiahe, Gansu	多年生 Perennial	90	10.3
‘兰箭3号’ V. sativa cv. ‘Lanjian 3’	2010	甘肃夏河 Xiahe, Gansu	一年或两年生 Annual or biennial	0	68.5

种名 Species	采收时间 Harvest time	产地 Collection site	生活型 Life form	硬实率 Hardseededness (%)	千粒重 1 000 seeds weight (g)
窄叶野豌豆 Vicia angustifolia	2010	甘肃夏河 Xiahe, Gansu	一年或两年生 Annual or biennial	91	20.5
山野豌豆 V. amoena	2011	甘肃夏河 Xiahe, Gansu	多年生 Perennial	90	20.3
歪头菜 V. unijuga	2010	甘肃夏河 Xiahe, Gansu	多年生 Perennial	90	10.3
‘兰箭3号’ V. sativa cv. ‘Lanjian 3’	2010	甘肃夏河 Xiahe, Gansu	一年或两年生 Annual or biennial	0	68.5

种 Species	T_b (℃)	T_o (℃)	T_c (℃)	回归方程 Regression equation	R²	δ	θ_T (°C·d)
窄叶野豌豆 Vicia angustifolia	0.43	19.64	30.53	y = 0.0315x - 0.0134(T_b)	1.00	0.72	31.70
窄叶野豌豆 Vicia angustifolia	0.43	19.64	30.53	y = -0.0556x + 1.6975(T_c)	0.95	6.95	16.30
山野豌豆 V. amoena	3.29	19.84	37.17	y = 0.0287x - 0.0944(T_b)	1.00	1.23	34.88
山野豌豆 V. amoena	3.29	19.84	37.17	y = -0.0274x + 1.0184(T_c)	0.99	0.95	35.62
歪头菜 V. unijuga	2.44	20.09	37.37	y = 0.028x - 0.0684(T_b)	0.99	1.26	35.88
歪头菜 V. unijuga	2.44	20.09	37.37	y = -0.0286x + 1.0687(T_c)	0.98	2.00	35.37
‘兰箭3号’ V. sativa cv. ‘Lanjian 3’	-0.48	16.05	31.66	y = 0.0281x + 0.0135(T_b)	0.93	5.06	35.67
‘兰箭3号’ V. sativa cv. ‘Lanjian 3’	-0.48	16.05	31.66	y = -0.0297x + 0.941(T_c)	0.94	4.43	35.14

种 Species	T_b (℃)	T_o (℃)	T_c (℃)	回归方程 Regression equation	R²	δ	θ_T (°C·d)
窄叶野豌豆 Vicia angustifolia	0.43	19.64	30.53	y = 0.0315x - 0.0134(T_b)	1.00	0.72	31.70
窄叶野豌豆 Vicia angustifolia	0.43	19.64	30.53	y = -0.0556x + 1.6975(T_c)	0.95	6.95	16.30
山野豌豆 V. amoena	3.29	19.84	37.17	y = 0.0287x - 0.0944(T_b)	1.00	1.23	34.88
山野豌豆 V. amoena	3.29	19.84	37.17	y = -0.0274x + 1.0184(T_c)	0.99	0.95	35.62
歪头菜 V. unijuga	2.44	20.09	37.37	y = 0.028x - 0.0684(T_b)	0.99	1.26	35.88
歪头菜 V. unijuga	2.44	20.09	37.37	y = -0.0286x + 1.0687(T_c)	0.98	2.00	35.37
‘兰箭3号’ V. sativa cv. ‘Lanjian 3’	-0.48	16.05	31.66	y = 0.0281x + 0.0135(T_b)	0.93	5.06	35.67
‘兰箭3号’ V. sativa cv. ‘Lanjian 3’	-0.48	16.05	31.66	y = -0.0297x + 0.941(T_c)	0.94	4.43	35.14

种 Species	T_b (℃)	T_c (℃)	回归方程 Regression equation	R²	δ	θ_T (°C·d)
窄叶野豌豆 Vicia angustifolia	0.0	32.5	y = 2.2063lnx - 7.7004(T_b)	0.84	0.45	32.8
窄叶野豌豆 Vicia angustifolia	0.0	32.5	y = 0.7734lnx - 2.4399(T_c)	0.79	1.29	23.4
山野豌豆 V. amoena	3.0	37.0	y = 3.6854lnx - 13.428(T_b)	0.89	0.27	38.2
山野豌豆 V. amoena	3.0	37.0	y = 2.8209lnx - 10.105(T_c)	0.91	0.35	35.0
歪头菜 V. unijuga	2.0	37.0	y = 4.3563lnx - 16.095(T_b)	0.91	0.23	40.2
歪头菜 V. unijuga	2.0	37.0	y = 3.2947lnx - 11.701(Tc)	0.95	0.30	34.9
‘兰箭3号’ V. sativa cv. ‘Lanjian 3’	-2.0	31.0	y = 1.2441lnx - 4.5295(T_b)	0.93	0.80	38.1
‘兰箭3号’ V. sativa cv. ‘Lanjian 3’	-2.0	31.0	y = 0.9857lnx - 3.2453(T_c)	0.97	1.02	26.9