珍珠柴幼苗叶片和根系形态特征对干旱胁迫的响应

doi:10.13866/j.azr.2024.01.09

Abstract

Abstract:

Exploring the response of leaf and root morphological characteristics of desert plants to drought stress is helpful in understanding and predicting their growth regulation strategies under the climate change scenario. The seedlings of the typical desert plant Caroxylon passerinum were treated with slow and rapid drought, and the morphological indices of leaves and roots were measured. The morphological characteristics of leaves and roots of C. passerinum seedlings under drought stress were analyzed using slow and fast drought treatments. The results showed that: (1) with an extension in slow drought stress treatment time, thick-root diameter, fine-root specific length, and specific root area decreased; the leaf tissue density under rapid drought treatment increased; after slow drought treatment, the thick-root tissue density increased, while it increased at first and then decreased post-rapid drought treatment. (2) At the end of the growth period of 54 days, the thick-root diameter reduced markedly under the two treatments; the succulent degree and water content were significantly lower under rapid drought than those of the control and slow drought treatments, respectively. The thick-root tissue density of C. passerinum seedlings increased significantly after 37 days of stress, which was higher post-slow than fast drought. (3) The first four axes of principal components were mainly affected by coarse-root specific root length, thick-root tissue density, fine-root specific root length, and specific leaf area. Correlation analysis revealed that 29 pairs of characters were interrelated. In summary, the leaves, thick roots, and fine roots of C. passerinum showed varying adaptation strategies especially by reducing the diameter of thick roots under the two types of drought treatment. Under rapid drought, C. passerinum adapted to soil water deficit by enhancing the leaf tissue density and reducing fine-root specific root length and specific root area. Thus, C. passerinum seedlings adapt to drought through a coordination or tradeoff within and between leaf and root traits.

Key words: drought stress, morphological characteristics, leaf, root, Caroxylon passerinum

YAN Qiaofang, SHAN Lishan, XIE Tingting, WANG Hongyong, SHI Yating. Morphological characteristics of the leaves and roots of Caroxylon passerinum seedlings in response to drought-induced stress[J].Arid Zone Research, 2024, 41(1): 92-103.

Figures/Tables 8

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性状	干旱强度	干旱时间	交互作用
肉质化程度/（g·g^-1）	0.207	21.456^**	1.844
叶片含水量/%	3.944^*	16.404^**	5.385^**
比叶面积/（cm²·g^-1）	0.543	1.181	1.434
叶组织密度/（g·cm^-3）	0.155	1.753	1.805
粗根比根长/（cm·g^-1）	4.405^*	12.653^**	2.979
粗根比根面积/（cm²·g^-1）	8.380^**	9.602^**	1.119
粗根组织密度/（g·cm^-3）	8.498^**	18.124^**	2.047
粗根直径/mm	1.292	3.258	7.588^**
细根比根长/（cm·g^-1）	6.424^**	29.991^**	7.112^**
细根比根面积/（cm²·g^-1）	20.576	22.702^**	5.228^**
细根组织密度/（g·cm^-3）	6.594^*	114.10^**	41.609^**
细根直径/mm	25.939^**	49.613^**	9.015^**

	PC1	PC2	PC3	PC4
肉质化程度	0.409	-0.150	0.125	0.070
叶片含水量	0.365	-0.237	0.231	-0.105
比叶面积	0.215	-0.331	-0.087	0.545
叶组织密度	-0.259	0.416	-0.133	-0.342
粗根比根长	0.279	0.503	0.035	0.255
粗根比根面积	0.353	0.063	-0.338	-0.129
粗根组织密度	0.282	0.503	0.105	0.187
粗根直径	0.364	0.013	-0.286	-0.276
细根比根长	-0.252	-0.221	-0.539	0.099
细根比根面积	-0.279	0.205	0.231	0.393
细根组织密度	-0.044	-0.182	0.590	-0.331
细根直径	-0.168	-0.065	0.073	0.322
贡献率/%	36.868	15.645	13.826	12.406
累积贡献率/%	36.868	52.512	66.338	78.744

Morphological characteristics of the leaves and roots of Caroxylon passerinum seedlings in response to drought-induced stress

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