Effect of drought stress on the hydraulic traits of Salsola passerina

doi:10.11686/cyxb2024393

Abstract

Abstract:

Moisture is a major limiting factor for plant survival and growth in arid zones， and reductions in available soil moisture directly affect the water transport capacity and embolism vulnerability of plants. Nevertheless， related studies on the dynamic change characteristics of hydraulic traits in desert plants under drought stress are still unclear. Therefore， in this research Salsola passerine， a dominant species in arid， semi-arid regions， was studied. Control （sufficient water supply） and drought treatments （no watering） were set up to determine the hydraulic parameters of S. passerina subjected to drought stress to different growth stages. The results demonstrated that， with increase in drought stress duration： 1） the leaf specific hydraulic conductivity of S. passerina exhibited a notable decline， embolism vulnerability notably increased， and the hydraulic safety boundary showed a significant decline， while sapwood-specific hydraulic conductivity did not differ significantly between control and drought treatments； 2） the water regulation responses of S. passerina subjected to drought stress exhibited a proclivity towards water-variable behavior， in comparison to the control； 3） decoupling between embolism resistance and water transport efficiency of drought-treated S. passerina； 4） hydraulic safety boundary and sapwood-specific hydraulic conductivity are the main adaptive traits of S. passerina in response to drought stress. Furthermore， these responses can be modulated to adapt to soil moisture changes. In conclusion， the hydraulic traits of S. passerina were significantly modified by drought stress， with higher water transport efficiency maintained at the cost of embolism vulnerability under drought stress. Thus， higher hydraulic risk exists.

Key words: drought stress, Salsola passerina, hydraulic traits, hydraulic efficiency-safety trade-off, hydraulic strategies

Xing-long ZHANG, Li-shan SHAN, Hong-yong WANG, Ting-ting XIE, Jing MA. Effect of drought stress on the hydraulic traits of Salsola passerina[J]. Acta Prataculturae Sinica, 2025, 34(9): 87-96.

Figures/Tables 9

Table 1 Two-way ANOVA of water content and treatment time on hydraulic traits

性状 Traits	水分 Water	处理时间 Treatment time	交互作用 Interaction
清晨叶水势Predawn leaf water potential	106.72**	17.50**	30.97**
正午叶水势Midday leaf water potential	361.94**	34.84**	165.05**
叶比导率Leaf specific hydraulic conductivity	25.88**	6.03*	5.33**
边材比导率Sapwood-specific hydraulic conductivity	6.68*	0.06	2.02
栓塞抗性Embolism vulnerability	47.39**	14.47**	4.16*
水力安全阈值Hydraulic safety margin	600.11**	73.90**	200.19**

Fig.1 Variation of leaf water potential

Fig.2 Hydraulic area of S. passerina seedlings under adequate water supply and drought treatment

Fig.3 Variation characteristics of leaf specific hydraulic conductivity and sapwood-specific hydraulic conductivity

Fig.4 Embolism vulnerability （P50） and variation of hydraulic safety margin

Fig.5 The correlation between hydraulic traits

Fig.6 Correlation between the sapwood-specific hydraulic conductivity （KS） and embolism vulnerability （P50） of S. passerina seedlings under different treatments

Fig.7 Principal component analysis of the hydraulic strategy of S. passerina

Table 2 Principal component analysis variable factor loading values

主成分 Principal component	ψ_PD	ψ_MD	K_L	K_S	P₅₀	HSM
PC1	0.44	0.43	0.40	0.31	-0.41	0.45
PC2	-0.08	0.02	-0.36	0.90	0.22	-0.04

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