Effects of Drought Stress on Seed Germination and Seedling Growth of Pinus sylvestris var.mongolica from Different Introduction Regions

doi:10.13466/j.cnki.lyzygl.2022.03.010

Abstract

Abstract:

In order to understand the drought resistance of Pinus sylvestris var.mongolica seeds germination and seedling growth,the seeds of P.sylvestris from Zhangwu County,Weichang County,Duolun County,Youyu County,Datong County were collected as study materials,and polyethylene glycol (PEG6000) solution was used to simulate different drought stress treatments.The effects of drought stress on seed germination and seedling growth in these regions were studied and the results showed that the seed germination and seedling growth of P.sylvestris from different introduction regions responded differently to drought stress.The seeds of P.sylvestris from Youyu County adapted to germinate under drought level with a water potential gradient of -0.177 Mpa;seeds from Zhangwu County,Duolun County and Weichang County could germinate under drought level with a water potential gradient of -0.735 Mpa.Except the seeds of P.sylvestris from Datong County,the stronger the drought stress,the slower the germination in other introduction regions.Seedlings of P.sylvestris from Weichang County did not grow well under drought stress.Except Weichang County,the radicle length of seedlings in other introduction regions increased under drought stress compared with CK treatment,and the low drought stress could promote,but high drought stress could inhibit the diameter of seedling embryo axis with the increase of drought stress.According to the analysis,the drought resistance of P.sylvestris seeds in the germination stage from strong to weak was as follows: Datong County>Zhangwu County>Duolun County>Youyu County>Weichang County.Within a certain range,the seeds of P.sylvestris adapted to local environmental conditions,with the drought resistance of the seeds of P.Sylvestris becoming stronger as the region changing to dryer.

Key words: Pinus sylvestris var.Mongolica, seed germination, seedling growth, drought resistance, Three Northern region

CLC Number:

S791.253

ZHANG Risheng, WANG Dongli, WANG Cuiping, CHI Linlin. Effects of Drought Stress on Seed Germination and Seedling Growth of Pinus sylvestris var.mongolica from Different Introduction Regions[J]. FOREST RESOURCES WANAGEMENT, 2022, (3): 60-66.

Figures/Tables 7

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引种区	采集地	经纬度	海拔 /m	土壤类型	林龄 /a	林分密度/ (株/hm²)	树高 /m	胸径 /cm
ZW	辽宁彰武县章古台镇 (简称彰武县)	42°02'37.914″N 119°35'06.282″E	221	风沙土	28	530	8.09	17.71
WC	河北围场县塞罕坝林场 (简称围场县)	42°25'04.680″N 117°15'58.782″E	1546	风沙土	20	1667	6.12	13.40
DL	内蒙古多伦县大宝生态园 (简称多伦县)	42°08'22.830″N 116°29'20.784″E	1263	风沙土	20	2200	6.50	10.40
YY	山西右玉县南山公园 (简称右玉县)	39°57'53.178″N 112°29'12.606″E	1434	黄绵土	28	1884	8.50	16.00
DT	山西大同县九梁洼林场 (简称大同县)	40°01'55.032″N 113°15'10.782″E	1093	风沙土	27	3210	10.40	15.10

幼苗指标	引种区	CK	T1	T2	T3
鲜重/mg	ZW	39.6±2.13a	27.4±1.41b	30.5±2.35b	8.42±3.78c
	WC	27.3±1.06	—	—	—
	DL	44.8±3.28	37.6±2.34	40.0±2.68	—
	YY	15.4±6.88b	37.6±6.07a	38.3±3.54a	12.92±5.81b
	DT	41.1±5.02a	39.5±4.34ab	28.6±3.33b	31.8±2.20ab
胚芽长/cm	DT	41.1±5.02a	39.5±4.34ab	28.6±3.33b	31.8±2.20ab
	ZW	2.16±0.14ab	1.43±0.06b	1.53±0.07b	0.76±0.08c
	WC	2.27±0.09	—	—	—
	DL	2.18±0.16	2.00±0.10	1.93±0.12	—
	YY	1.73±0.15ab	1.63±0.22ab	1.83±0.14a	1.13±0.03b
	DT	2.10±0.13a	2.33±0.10a	1.45±0.15b	1.56±0.13b
胚根长/cm	DT	2.10±0.13a	2.33±0.10a	1.45±0.15b	1.56±0.13b
	ZW	4.38±0.32ab	3.88±0.13b	5.11±0.58a	3.20±0.14b
	WC	3.28±0.21	—	—	—
	DL	3.20±0.49b	4.95±0.42a	6.06±0.46a	—
	YY	3.57±0.30ab	4.67±0.79ab	6.13±0.47a	2.38±1.10b
	DT	3.07±0.54b	3.13±0.51b	4.65±0.40ab	5.56±0.59a
胚轴直径/mm	DT	3.07±0.54b	3.13±0.51b	4.65±0.40ab	5.56±0.59a
	ZW	0.70±0.02a	0.73±0.02a	0.67±0.02a	0.33±0.15b
	WC	0.67±0.03	—	—	—
	DL	0.78±0.03	0.81±0.02	0.78±0.02	—
	YY	0.35±0.16b	0.62±0.05ab	0.83±0.03a	0.35±0.16b
	DT	0.73±0.03ab	0.85±0.08a	0.8±0.03ab	0.68±0.02b

引种区	萌发率	萌发时滞	鲜重	胚芽长	胚根长	胚轴直径	加权平均值	排序
ZW	0.80	0.15	0.49	0.26	0.66	0.68	0.62	2
WC	0.14	0.60	-0.19	-0.07	-0.20	-0.37	-0.17	5
DL	0.52	0.27	0.55	0.52	0.28	0.49	0.39	3
YY	0.46	0.28	0.41	0.61	0.31	0.37	0.34	4
DT	0.61	0.22	0.70	0.49	0.65	0.83	0.68	1
权重系数	0.051	0.083	0.189	-0.050	0.436	0.290

引种区	海拔/m	降水量/mm	蒸发量/mm	年均温/℃	无霜期/d	干旱指数
辽宁彰武县章古台镇	226.5	491.4	1590.0	6.1	155	3.24
河北围场县塞罕坝机械林场	1500	458.7	979.4	-1.0	64	2.14
山西右玉县	1400	414.4	1018.8	3.5	104	2.46
山西大同县	1157	392.6	1909.0	6.4	125	4.86
内蒙古多伦县	1241	313.2	966.1	1.6	90	3.08