胡杨异形叶枝叶大小关系对干旱胁迫的响应

doi:10.11707/j.1001-7488.20221205

Abstract

Abstract:

Objective: The purpose of this study is to analyze whether changes in the twig-leaf size relationships could reduce the drought stress of Populus euphratica with heteromorphic leaves, which could provide reference for clarifying the formation mechanism of heteromorphic leaves and the conservation of P. euphratica individuals. Method: Three main heteromorphic leaves, i.e., ovate, nearly ovate and lanceolate leaf, of P. euphratica in the Ebinur Lake Wetland National Nature Reserve in the Xinjiang, China, were taken as the research object. The cross-sectional area of twigs, the total leaf area on the twigs, the hydraulic and anatomical traits were determined experimentally in 18 P. euphratica individuals, and then the standardized major axis regression (SMA) was used to compare the difference in the relationship of size between twig and leaf among three heteromorphic leaves. Multi-correlation analysis was conducted to test the effects of the twig-leaf size relationships on the hydraulic and anatomical traits. Result: 1) There was a significant isometric growth relationship between the cross-sectional area of twigs and the total leaf area. The regression slope of twig-leaf size relationships ranged from 0.65 to 1.06; which had no significant difference compared with 1 (P> 0.05). 2) The SMA results showed that there was a common slope (a = 0.83) for the regression of the total leaf area to twig cross-sectional area among heteromorphic leaves. Under the condition of common slope, the intercept (b) differed among the three heteromorphic leaves: ovate (1.41) > nearly ovate (1.35) > lanceolate leaf (1.25). 3) There were significant differences in leaf length, leaf width, leaf length-width ratio, maximum transpiration rate, Huber value, stomatal size and density, and palisade tissue thickness among the three heteromorphic leaves (P < 0.05), while pre-dawn leaf water potential and specific conductivity of twigs were not different (P> 0.05). 4) The twig-leaf size relationship was significantly correlated with Huber value, stomatal size and density, palisade tissue thickness, maximum transpiration rate and pre-dawn leaf water potential (P < 0.05). Conclusion: The isometric growth relationship between twig and leaf is an adaptive strategy of P. euphratica to maintain the balance between water transport and mechanical support. Under the condition of the same cross-sectional area of twigs, the total area of ovate leaf was higher than that of nearly ovate, and even higher than that of lanceolate leaf. The change of the twig-leaf size relationship of P. euphratica could improve the hydraulic properties, thereby increase the water transport capacity and reduce the drought stress.

Key words: heteromorphic leaves, Corner rule, allometric growth, twig-leaf size relationship, hydraulic transportation, resource allocation strategy

CLC Number:

S718.43

Cuicui Kong,Anwar Elhamjan,Ligang Ma,Yanxin Long,Yayun Wang,Xiaodong Yang. Response of Twig-Leaf Size Relationships Populus euphratica with Heteromorphic Leaves to Drought Stress[J]. Scientia Silvae Sinicae, 2022, 58(12): 42-51.

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References 0

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异形叶 Heteromorphic leaves	采样高度 Sampling height/m	样本量 Sample size/N	叶片塑形特征 Leaves characteristics
异形叶 Heteromorphic leaves	采样高度 Sampling height/m	样本量 Sample size/N	单叶面积 Single leaf area/cm²	叶长 Leaf length/cm	叶宽 Leaf width/cm	叶长宽比 Length-width ratio
卵形叶Oval leaf	>3.5	9	10.20 ± 3.15a	3.11 ± 0.45c	3.59 ± 0.41a	0.86±0.03c
近卵形叶Nearly ovate leaf	1.5~4.0	18	7.72 ± 1.73a	3.98 ± 0.33b	2.17 ± 0.38b	1.86±0.24b
披针形叶Lanceolate leaf	<2.2	27	6.86 ± 1.25a	6.08 ± 1.01a	1.64 ± 0.38c	3.90±1.44a
统计结果Statistical results	F		1.88	15.83	20.18	10.07
统计结果Statistical results	P-value		0.23	<0.01	<0.01	<0.05

异形叶 Heteromorphic leaves	采样高度 Sampling height/m	样本量 Sample size	水力学性状Hydraulic traits				解剖性状Anatomical traits
异形叶 Heteromorphic leaves	采样高度 Sampling height/m	样本量 Sample size	最大蒸腾速率 Maximum transpiration rate/(g· m^-2h^-1)	黎明前叶水势 Pre-dawn leaf water potential/MPa	枝比导率 Specific conductivity of twigs/(kg·s^-1MPa^-1)	胡伯尔值 Huber value	气孔大小 Stomata size /μm²	气孔密度 Stomatal density/mm^-2	栅栏组织厚度 Palisade tissue thickness/μm
卵形叶 Oval leaf	> 3.5	9	9.77±0.90a	-1.91±0.37a	0.21±0.20a	3.29×10^-4±1.65×10^-2b	18.02±0.47a	172.33±4.93a	82.61±0.78a
近卵形叶 Nearly ovate leaf	1.5~4.0	18	6.70±1.34b	-1.59±0.51a	0.30±0.11a	3.88×10^-4±1.63×10^-2b	16.35±0.82b	148.67±7.09b	79.27±1.22b
披针形叶 Lanceolate leaf	<2.2	27	5.11±1.43c	-1.78±0.47a	0.26±0.80a	6.03×10^-4±2.04×10^-4a	14.23±0.64c	144.89±6.74c	64.93±8.11b
统计结果 Statistical results	F		13.72	0.54	1.08	3.66	19.60	40.35	366.52
统计结果 Statistical results	P-value		<0.001	0.60	0.36	<0.05	<0.001	<0.001	<0.001

性状类型 Types of functional traits	性状 Traits	复相关系数 Multiple correlation coefficient	F	P-value
水力学性状 Hydraulic traits	最大蒸腾速率Maximum transpiration rate/ (g· m^-2h^-1)	0.70	7.39	<0.01
	黎明前叶水势Pre-dawn leaf water potential /MPa	0.65	5.37	<0.05
	枝比导率Specific conductivity of twigs/ (kg·s^-1m^-1MPa^-1)	0.27	0.60	0.56
	胡伯尔值Huber value	0.73	8.30	<0.01
解剖性状 Anatomical traits	气孔大小Stomata size/μm²	0.80	13.69	<0.01
	气孔密度Stomatal density/mm^-2	0.66	5.73	<0.01
	栅栏组织厚度Palisade tissue thickness/μm	0.74	9.02	<0.01

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Response of Twig-Leaf Size Relationships Populus euphratica with Heteromorphic Leaves to Drought Stress

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