Plasticity of a karst endemic plant Juglans regia L. f. luodianense Liu et Xu in response to soil moisture

doi:10.3969/j.issn.1004-1524.2021.02.09

Acta Agriculturae Zhejiangensis ›› 2021, Vol. 33 ›› Issue (2): 259-269.DOI: 10.3969/j.issn.1004-1524.2021.02.09

• Horticultural Science • Previous Articles Next Articles

Plasticity of a karst endemic plant Juglans regia L. f. luodianense Liu et Xu in response to soil moisture

CHENG Jing^a^,^b(), LIU Jiming^a^,^b^,^*(), WANG Shu^a^,^b, WANG Deng^a^,^b, LI Lixia^a^,^b, XU Guorui^a^,^b, CHEN Meng^a^,^b, HUANG Luting^a^,^b

a. College of Forestry, Guizhou University, Guiyang 550025, China
b. Forest Ecology Research Center, Guizhou University, Guiyang 550025, China

Received:2020-07-03 Online:2021-02-25 Published:2021-02-25
Contact: LIU Jiming

Abstract

Abstract:

To understand the adaptability and the plasticity difference of Karst endemic plants to different water conditions, taking 1-year-old Juglans regia L. f. luodianense Liu et Xu as the study material, the differences in plasticity of morphological, biomass allocation, physiological characteristics of seedlings of J. regia L. f. luodianense Liu et Xu were discussed under different water conditions [(100±5)%, (80±5)%, (60±5)%, (40±5)%]. The results showed that, compared with CK group, the response of J. regia L. f. luodianense Liu et Xu under high and low water stress was as follows: seedling height, ground diameter growth, root length, leaf area and specific leaf area all decreased; fleshy degree of leaves significantly decreased, and compactness of leaf tissue structure increased under moderate low water stress (40±5)%. Distribution of plant stem and leaf resources decreased, the root resource input and the root-cap ratio increased under moderate low water stress, and total biomass decreased. Net photosynthetic rate (P_n) and transpiration rate (T_r) were all reduced, stomatal conductance (G_s) was slightly increased at mild high water level (100±5)%, and intercellular CO₂ concentration (C_i) was basically stable. The content of chlorophyll b and total amount of chlorophyll only increased under mild high water stress. Based on the plasticity indexes (ranging from 0.02 to 0.50) of seedlings of J. regia L. f.luodianense Liu et Xu under different water conditions, the net photosynthetic rate was up to 0.50, followed by leaf area and stem biomass, and chlorophyll a had a minimum plasticity of 0.02. There were significant differences in the sensitivity and regulatory mechanism to the plastic responses of different water conditions of seedlings of J. regia L. f. luodianense Liu et Xu, which were regulated by leaf area, stem biomass, and net photosynthetic rate. Under normal water supply (80±5)% and mild high water stress (100±5)%, the water demand for the growth of seedlings of J. regia L. f.luodianense Liu et Xu could be satisfied.

Key words: Karst endemic plant, Juglans regia L. f. luodianense Liu et Xu, soil moisture, plasticity

CLC Number:

S718.52

CHENG Jing, LIU Jiming, WANG Shu, WANG Deng, LI Lixia, XU Guorui, CHEN Meng, HUANG Luting. Plasticity of a karst endemic plant Juglans regia L. f. luodianense Liu et Xu in response to soil moisture[J]. Acta Agriculturae Zhejiangensis, 2021, 33(2): 259-269.

Figures/Tables 7

References 48

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处理 Treatment	苗高 Height/cm	地径 Diameter/cm	叶面积 Leaf area/cm²	比叶面积 SLA/(cm²·g)	根茎比 RRS	根长 RL/cm	叶片肉质化程度LS
CK	53.10±1.56 a	1.08±0.05 a	5 194.78±100.26 a	311.17±5.61 a	0.74±0.02 a	42.82±0.88 a	3.52±0.07 a
W1	50.48±1.21 ab	1.11±0.05 a	4 690.26±89.05 b	318.99±6.36 a	0.84±0.01 a	39.51±0.78 a	3.59±0.09 a
W2	45.10±0.59 b	1.08±0.03 a	3 069.02±59.27 cd	251.99±3.21 b	0.88±0.03 a	36.88±0.65 a	3.46±0.04 a
W3	47.82±1.06 b	0.94±0.03 b	2 705.54±78.01 d	254.54±4.69 b	0.77±0.01 a	39.85±0.75 a	2.24±0.08 b

处理 Treatment	苗高 Height/cm	地径 Diameter/cm	叶面积 Leaf area/cm²	比叶面积 SLA/(cm²·g)	根茎比 RRS	根长 RL/cm	叶片肉质化程度LS
CK	53.10±1.56 a	1.08±0.05 a	5 194.78±100.26 a	311.17±5.61 a	0.74±0.02 a	42.82±0.88 a	3.52±0.07 a
W1	50.48±1.21 ab	1.11±0.05 a	4 690.26±89.05 b	318.99±6.36 a	0.84±0.01 a	39.51±0.78 a	3.59±0.09 a
W2	45.10±0.59 b	1.08±0.03 a	3 069.02±59.27 cd	251.99±3.21 b	0.88±0.03 a	36.88±0.65 a	3.46±0.04 a
W3	47.82±1.06 b	0.94±0.03 b	2 705.54±78.01 d	254.54±4.69 b	0.77±0.01 a	39.85±0.75 a	2.24±0.08 b

处理 Treatment	栅栏组织厚度 Palisade tissue thickness/μm	海绵组织厚度 Spongy tissue thickness/μm	叶片总厚度 LT/μm	栅/海 Palisade tissue/ spongy tissue	叶片组织结构紧密度 CTR/%	叶片组织结构疏松度 SR/%
CK	45.293±0.816 aA	55.876±0.823 abAB	124.198±1.211 aA	0.811±0.015 aAB	36.5±0.005 aA	45.0±0.3 bcAC
W1	43.764±1.173 aA	51.600±1.683 bB	119.444±1.795 abAB	0.848±0.035 aA	36.6±0.008 aA	43.2±0.9 cC
W2	33.683±0.762 cC	58.552±1.942 aA	116.076±1.020 bcB	0.575±0.016 cC	29.0±0.004 cB	50.4±0.9 aA
W3	38.389±1.012 bB	54.013±1.679 abAB	113.783±1.768 cB	0.711±0.035 bB	33.7±0.011 bA	47.5±0.9 abAB

处理 Treatment	栅栏组织厚度 Palisade tissue thickness/μm	海绵组织厚度 Spongy tissue thickness/μm	叶片总厚度 LT/μm	栅/海 Palisade tissue/ spongy tissue	叶片组织结构紧密度 CTR/%	叶片组织结构疏松度 SR/%
CK	45.293±0.816 aA	55.876±0.823 abAB	124.198±1.211 aA	0.811±0.015 aAB	36.5±0.005 aA	45.0±0.3 bcAC
W1	43.764±1.173 aA	51.600±1.683 bB	119.444±1.795 abAB	0.848±0.035 aA	36.6±0.008 aA	43.2±0.9 cC
W2	33.683±0.762 cC	58.552±1.942 aA	116.076±1.020 bcB	0.575±0.016 cC	29.0±0.004 cB	50.4±0.9 aA
W3	38.389±1.012 bB	54.013±1.679 abAB	113.783±1.768 cB	0.711±0.035 bB	33.7±0.011 bA	47.5±0.9 abAB

Plasticity of a karst endemic plant Juglans regia L. f. luodianense Liu et Xu in response to soil moisture

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