| Effects of γ\|aminobutyric acid on the growth and photosynthetic physiology of alfalfa seedlings under PEG stress |
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| DOI：10.7606/j.issn.1000-7601.2025.04.06 |
| Key Words: alfalfa seedling γ\|aminobutyric acid PEG stress photosynthetic parameters membership function |
| Author Name | Affiliation | | YANG Lili | College of Pratacultural Science, Gansu Agricultural University, Key Laboratory of Grassland Ecosystem, Ministry of Education, Key Laboratory of Forage Gerplasm Innovation and New Variety Breeding of Ministry of Agriculture and Rural Affairs, Lanzhou, Gansu 730070, China | | NAN Lili | College of Pratacultural Science, Gansu Agricultural University, Key Laboratory of Grassland Ecosystem, Ministry of Education, Key Laboratory of Forage Gerplasm Innovation and New Variety Breeding of Ministry of Agriculture and Rural Affairs, Lanzhou, Gansu 730070, China | | CHEN Na | College of Pratacultural Science, Gansu Agricultural University, Key Laboratory of Grassland Ecosystem, Ministry of Education, Key Laboratory of Forage Gerplasm Innovation and New Variety Breeding of Ministry of Agriculture and Rural Affairs, Lanzhou, Gansu 730070, China | | MA Xiangxiang | College of Pratacultural Science, Gansu Agricultural University, Key Laboratory of Grassland Ecosystem, Ministry of Education, Key Laboratory of Forage Gerplasm Innovation and New Variety Breeding of Ministry of Agriculture and Rural Affairs, Lanzhou, Gansu 730070, China | | TIAN Ge | College of Pratacultural Science, Gansu Agricultural University, Key Laboratory of Grassland Ecosystem, Ministry of Education, Key Laboratory of Forage Gerplasm Innovation and New Variety Breeding of Ministry of Agriculture and Rural Affairs, Lanzhou, Gansu 730070, China | | WANG Yong | College of Pratacultural Science, Gansu Agricultural University, Key Laboratory of Grassland Ecosystem, Ministry of Education, Key Laboratory of Forage Gerplasm Innovation and New Variety Breeding of Ministry of Agriculture and Rural Affairs, Lanzhou, Gansu 730070, China | | PAN Sichun | College of Pratacultural Science, Gansu Agricultural University, Key Laboratory of Grassland Ecosystem, Ministry of Education, Key Laboratory of Forage Gerplasm Innovation and New Variety Breeding of Ministry of Agriculture and Rural Affairs, Lanzhou, Gansu 730070, China |
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| Abstract: |
| Five new drought\|resistant alfalfa lines (P1, P2, P3, P4, and P5) and five drought\|sensitive alfalfa varieties (15354, 7657, 7470, 7740, and 15578) were used as research materials, and -1.6 MPa PEG-6000 was used to simulate drought stress. A total of five treatments of control, drought stress (-1.6 MPa PEG-6000), and spraying 5, 10, and 15 mmol·L-1 GABA under drought stress were set up to investigate the effects of exogenous GABA on the growth, development, and photosynthetic characteristics of alfalfa seedlings under drought conditions. The results showed that the morphological indicators of aboveground (plant height, leaf area) and underground (root surface area, root volume, root diameter, and root tip number) parts of the test alfalfa showed a first increased and then decreased trend with the increase of GABA concentration and reached the maximum value under the T3 treatment. Compared with T1, the increases were in the range of 7.09% to 20.28%, 17.35% to 55.60%, 10.77% to 54.37%, 8.48% to 30.45%, 14.11% to 42.91%, and 15.36% to 100.37%, respectively. External application of different concentrations of GABA improved the drought resistance of alfalfa and significantly decreased underground biomass, total root length, stomatal limiting value, and water use efficiency, which reached the minimum under T3 treatment, and the decrement varied in the ranges of 24.07% to 59.83%, 26.16% to 58.99%, 33.76% to 51.44%, and 19.17% to 26.63%, respectively, compared with T1. The membership function analysis showed that GABA had the best mitigation effect on drought in alfalfa under T3 treatment, and the mitigation effect on sensitive materials was more obvious than that of new drought\|resistant strains. |
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