Study and Evaluation on Drought Resistance of Exochorda Lindl.

doi:10.13466/j.cnki.lyzygl.2023.02.011

Abstract

Abstract:

The 2-year-old seedlings of Exochorda racemosa and Exochorda serratifolia were used as experimental materials.Under the condition of artificial water control,pot experiments were conducted with five water gradients of 100%(CK),75%(Light drought,LD),50%(Moderate drought,MD),25%(Severe drought,SD)and 0%(Extreme drought,ED)for drought stress treatment.The morphological indexes,SPAD value and chlorophyll fluorescence kinetic parameters of two species of Exochorda under drought stress were measured.The drought resistance indexes were screened and evaluated by correlation analysis and principal component analysis.The results showed that:1) With the intensification of drought stress,the plant height,leaf number,leaf water content,SPAD value,F_m and F_v/F_m of two species of Exochorda decreased,while F_o increased,but the time difference of moderate drought treatment(MD) was not significant.2) Correlation analysis showed that there was a certain correlation between the drought resistance indicators,and there was a significant correlation between morphological indicators and physiological indicators.3) The results of principal component analysis showed that the seven drought resistance indicators could be divided into two categories,with a cumulative contribution rate of 96.17%.F_o,F_m,F_v/F_m,leaf water content and SPAD value were selected as five main drought resistance indicators to comprehensively evaluate the drought resistance of the two species of Exochorda Lindl.Exochorda racemosa could grow normally under severe drought (SD),and Exochorda serratifolia could grow normally under moderate drought (MD).

Key words: Exochorda racemosa, Exochorda serratifolia, drought stress, plant morphology, chlorophyll fluorescence

CLC Number:

Q945
S685.99

SUN Yi, LIU Boyang, SHI Qingsong, CHEN Yan, BAO Zhengyan, WANG Yang. Study and Evaluation on Drought Resistance of Exochorda Lindl.[J]. FOREST RESOURCES WANAGEMENT, 2023, (2): 79-87.

Figures/Tables 9

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指标	株高	叶片数量	叶片含水量	SPAD	F_o	F_m	F_v/F_m
株高	1.000
叶片数量	0.810^*	1.000
叶片含水量	0.885^**	0.584	1.000
SPAD值	0.927^**	0.853^*	0.781^*	1.000
F_o	-0.865^**	-0.454	-0.905^**	-0.693	1.000
F_m	0.855^**	0.450	0.901^**	0.703	-0.996^**	1.000
F_v/F_m	0.829^*	0.384	0.874^**	0.661	-0.994^**	0.995^**	1.000

指标	主成分1		主成分2
指标	载荷系数	权重	载荷系数	权重
株高	0.683	0.137	0.720	0.188
叶片数量	0.193	0.039	0.954	0.249
叶片含水量	0.865	0.174	0.417	0.109
SPAD值	0.387	0.078	0.879	0.229
F_o	-0.952	0.191	-0.288	0.075
F_m	0.949	0.191	0.304	0.079
F_v/F_m	0.949	0.191	0.270	0.070
特征值	5.689		1.043
方差贡献率/%	81.27		14.90