| Response of carbon, nitrogen, and phosphorus stoichiometry and stress\|resistance physiological characteristics of ammopiptanthus mongolicus at different leaf stages to climatic factors |
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| DOI：10.7606/j.issn.1000-7601.2025.02.26 |
| Key Words: Ammopiptanthus mongolicus leaf stages stoichiometry ecology physiological characteristics of stress resistance climatic factors |
| Author Name | Affiliation | | YANG Jinyuan | College of Biological Science and Engineering, North Minzu University, Key Laboratory of Ecological Protection of Agro\|pastoral Ecotones in the Yellow River Basin, National Ethnic Affairs Commission of the People’s Republic of China, Ningxia Key Laboratory of Microbial Resources Development and Applications in Special Environment, Yinchuan, Ningxia 750021, China | | LI Fangyu | College of Biological Science and Engineering, North Minzu University, Key Laboratory of Ecological Protection of Agro\|pastoral Ecotones in the Yellow River Basin, National Ethnic Affairs Commission of the People’s Republic of China, Ningxia Key Laboratory of Microbial Resources Development and Applications in Special Environment, Yinchuan, Ningxia 750021, China | | LI Chen | College of Biological Science and Engineering, North Minzu University, Key Laboratory of Ecological Protection of Agro\|pastoral Ecotones in the Yellow River Basin, National Ethnic Affairs Commission of the People’s Republic of China, Ningxia Key Laboratory of Microbial Resources Development and Applications in Special Environment, Yinchuan, Ningxia 750021, China | | CHEN Yuanyuan | College of Biological Science and Engineering, North Minzu University, Key Laboratory of Ecological Protection of Agro\|pastoral Ecotones in the Yellow River Basin, National Ethnic Affairs Commission of the People’s Republic of China, Ningxia Key Laboratory of Microbial Resources Development and Applications in Special Environment, Yinchuan, Ningxia 750021, China | | WANG Jiawei | College of Biological Science and Engineering, North Minzu University, Key Laboratory of Ecological Protection of Agro\|pastoral Ecotones in the Yellow River Basin, National Ethnic Affairs Commission of the People’s Republic of China, Ningxia Key Laboratory of Microbial Resources Development and Applications in Special Environment, Yinchuan, Ningxia 750021, China | | DENG Xiaojuan | College of Biological Science and Engineering, North Minzu University, Key Laboratory of Ecological Protection of Agro\|pastoral Ecotones in the Yellow River Basin, National Ethnic Affairs Commission of the People’s Republic of China, Ningxia Key Laboratory of Microbial Resources Development and Applications in Special Environment, Yinchuan, Ningxia 750021, China | | LIU Jianli | College of Biological Science and Engineering, North Minzu University, Key Laboratory of Ecological Protection of Agro\|pastoral Ecotones in the Yellow River Basin, National Ethnic Affairs Commission of the People’s Republic of China, Ningxia Key Laboratory of Microbial Resources Development and Applications in Special Environment, Yinchuan, Ningxia 750021, China |
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| Abstract: |
| The stoichiometric characteristics of carbon (C), nitrogen (N), and phosphorus (P), along with the physiological stress resistance traits—including membrane lipid peroxidation products such as malondialdehyde (MDA), antioxidant enzyme activities (superoxide dismutase （SOD）, catalase （CAT）, and peroxidase （POD）), and osmolyte contents (soluble sugar （SC） and proline （Pro）)—were analyzed in the leaves of Ammopiptanthus mongolicus collected at four growth stages: young leaf stage, flourishing leaf stage, old leaf stage I, and old leaf stage II. The changes rule among different leaf growth stages and response to climate factors: monthly mean temperature (MMT), monthly precipitation (MP), monthly illumination time (MIT), and monthly mean relative humidity (MMRH) were analyzed.The results showed that the average contents of C, N, and P in leaves of A. mongolicus were 591.50 g·kg-1,25.61 g·kg-1, and 1.32 g·kg-1, respectively. The average values of SC, Pro content, SOD, CAT, POD content and MDA content were 7.21 mg·g-1, 236.99 μg·g-1, 619.22 U·g-1, 21.17 μmol·min-1·g-1, 8 018 U·g-1, and 18.38 nmol·g-1, respectively. The content of C among different leaf growth stages were no significant differences (P>0.05). The content of N was no significant differences until the old leaf stage II, when it significantly increased to 2.86 g·kg-1. The content of P was first increasing and then decreasing and was the highest (1.44 g·kg-1) in the flourishing leaf stage. C∶N showed no significant change until the old leaf stage II, with a significant decrease of 20.92, and N∶P showed no significant change until the old leaf stage II, with a significant increase of 23.95. C∶P first decreased and then increased, reaching a minimum value of 413.64 during the peak leaf stage and a maximum value of 500.27 during the old leaf stage II. The content of SC and Pro, as well as the activity of SOD, first decreased and then increased, with the lowest values being 3.76 mg·g-1, 191.14 μg·g-1, and 237.57 U·g-1 during the peak leaf stage, and the highest values being 11.69 mg·g-1, 303.54 μg·g-1, and 892.03 U·g-1 during the old leaf stage II, respectively. CAT activity first decreased, then increased, and then decreased again, with the lowest reaching 11.35 μmol·min-1·g-1 during the peak leaf stage and the highest reaching 31.39 μmol·min-1·g-1 during the old leaf stage I. POD continued to increase until reaching a maximum of 9 572 U·g-1 during the old leaf stage II. MDA showed a trend of first increasing and then decreasing, with the highest peak leaf stage being 30.908 nmol·g-1 and the lowest old leaf stage II being 7.69 nmol·g-1. The Variation analysis showed that the contents and stoichiometric ratios of C, N, and P were relatively stable with leaves growth, but the antioxidant enzyme system changed significantly. The correlation analysis revealed that there was no significant correlation between leaf stoichiometric indexes and antioxidant enzyme indexes (P>0.05). Linear regression analysis showed that MMT, MP and MIT had no significant effects on all stoichiometric indexes (P>0.05). For membrane lipid peroxidation products, antioxidant enzymeand osmolyte, MMT had significant effects on else antioxidant enzymes indexes except Pro, MP had significant effects only on SC, SOD, CAT and MDA, and MIT had significant effects on only CAT, POD and MDA. MMRH had no significant effect on all membrane lipid peroxidation products, antioxidant enzymeand osmolyte indexes (P>0.05) and had significant effect on only P, C∶P, and N∶P in stoichiometric indexes. |
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