| Effects of low phosphorus stress on root architecture of sainfoin |
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| DOI：10.7606/j.issn.1000-7601.2023.02.07 |
| Key Words: sainfoin root architecture low phosphorus stress topological index fractal dimension |
| Author Name | Affiliation | | CHEN Jie | College of Pratacultural Science, Gansu Agricultural University, Key Laboratory of Grassland Ecosystem, Ministry of Education, Lanzhou,Gansu 730070, China | | NAN Lili | College of Pratacultural Science, Gansu Agricultural University, Key Laboratory of Grassland Ecosystem, Ministry of Education, Lanzhou,Gansu 730070, China | | WANG Kun | College of Pratacultural Science, Gansu Agricultural University, Key Laboratory of Grassland Ecosystem, Ministry of Education, Lanzhou,Gansu 730070, China | | XIA Jing | College of Pratacultural Science, Gansu Agricultural University, Key Laboratory of Grassland Ecosystem, Ministry of Education, Lanzhou,Gansu 730070, China | | MA Biao | College of Pratacultural Science, Gansu Agricultural University, Key Laboratory of Grassland Ecosystem, Ministry of Education, Lanzhou,Gansu 730070, China | | YAO Yuheng | College of Pratacultural Science, Gansu Agricultural University, Key Laboratory of Grassland Ecosystem, Ministry of Education, Lanzhou,Gansu 730070, China | | HE Haipeng | College of Pratacultural Science, Gansu Agricultural University, Key Laboratory of Grassland Ecosystem, Ministry of Education, Lanzhou,Gansu 730070, China |
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| Abstract: |
| To study the effects of low phosphorus stress on the root architecture of sainfoin, five sainfoin materials grown for 80 days were treated with constant normal phosphorus (1.00 mmol·L-1 KH24, NP) and low phosphorus stress (0.01 mmol·L-1 KH24, LP) by nutrient solution sand culture method. Samples were taken at 0，12 days and 24 days respectively, and the planar and three\|dimensional geometric architecture of roots were studied. The results showed that under low phosphorus stress, the root length increased, and the phosphorus sensitive sainfoin 6 had the largest increase at 12 d and 24 d of stress, by 25.60% and 35.06%, respectively. However, the root surface area, root volume, root average diameter and root tip numbers were significantly inhibited, and with the increase of stress days, the inhibitory effect became more significant. The total number of internal connections of the longest root system channel of the tested material increased, while the total number of external connections of the root channel decreased.At 24 d of coercion, the low\|phosphorus tolerant sainfoin 5 had the largest decrease, with a decrease of 26.49%. The topological index of the tested materials were all small, close to 0.5, and the root architecture was close to dichotomous branching, which increased with the extension of stress time, and had a transition to herringbone branching. At 24 d of stress, the topological index of low\|phosphorus tolerant sainfoin 5 and 10295 increased the most, 12.85% and 12.91% respectively. The fractal dimension of each material increased with the increase of stress days, while the fractal abundance decreased.At 24 days of stress, the increase of fractal dimension of low\|phosphorus tolerant sainfoin 5 was the largest, and the decrease of fractal abundance was the smallest, which was 5.71% and 4.69% higher than that at 0 days of stress, respectively. Indicating that low\|phosphorus tolerant sainfoin 5 had a stronger ability to adapt to the stress conditions by changing the root architecture. |
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