| Effects of drought stress and application amount of phosphorus fertilizer on morphological and physiological characteristics of potato roots |
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| DOI：10.7606/j.issn.1000-7601.2020.01.16 |
| Key Words: phosphorus fertilizer application amount potato drought stress root physiology root development |
| Author Name | Affiliation | | WANG Tian | College of Life Science and Technology, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Gansu Key Laboratory of Crop Genetics and Germplasm Enhancement, Lanzhou, Gansu 730070, China | | ZHANG Shuhan | College of Life Science and Technology, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Gansu Key Laboratory of Crop Genetics and Germplasm Enhancement, Lanzhou, Gansu 730070, China | | YAN Shipeng | College of Life Science and Technology, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Gansu Key Laboratory of Crop Genetics and Germplasm Enhancement, Lanzhou, Gansu 730070, China | | ZHANG junlian | Gansu Key Laboratory of Crop Genetics and Germplasm Enhancement, Lanzhou, Gansu 730070, China
College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | LI Chaozhou | College of Life Science and Technology, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Gansu Key Laboratory of Crop Genetics and Germplasm Enhancement, Lanzhou, Gansu 730070, China |
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| Abstract: |
| A field experiment was conducted using the potato cultivar “Atlantic” as experimental material to study the effects of different phosphorus (P) fertilizer application amounts on root physiology and development of potato seedlings under drought stress. The purpose was to determine the optimum P fertilizer application amount for increasing potato yield and drought resistance under drought stress, and to provide theoretical support for potato production under water deficit conditions. The experiment was carried out with two drought stress treatments and one full irrigation. The soil water content was maintained at 9.5%, 14.0%, and 32.0%, respectively. The amount of 6 P fertilizers application quantities (P2O5) were used as: T1 (27.3 kg·hm-2), T2 (54.5 kg·hm-2), T3 (81.8 kg·hm-2), T4 (109.1 kg·hm-2), T5 (136.3 kg·hm-2), and no P fertilizer application as control (T0). The results showed that: (1) Compared with full irrigation treatment group, light drought caused the potato root water content decrease by 5.54% and O—[KG-1][JX*3]·[JX-*3]2 production rate and malondialdehyde content increased by 63.33% and 180.47%, respectively. Plant height and stolon number decreased by 11.74% and 7.66%, respectively. Potato root weight and tuber yield decreased by 9.85% and 6.75% respectively. (2) The best P fertilizer application amount in promoting the growth and development of potato seedlings under drought stress was 54.5 kg·hm-2 among all 6 treatments of P fertilizer application amounts. In the P fertilizer application amount of 54.5 kg·hm-2 under mild drought condition, the root activity of potato increased by 36.28%; superoxide dismutase, peroxidase, and catalase activities increased by 29.31%, 46.27%, and 114.53% respectively and the weight of potato tuber increased by 39.75%. In terms of root morphology, total root length, root surface area, and root volume of potato increased by 104.20%, 31.65%, and 21.06%, respectively. So, it is concluded that the growth of potato seedlings was inhibited significantly by drought stress, but proper amount of P fertilizer application could alleviate the degree of root lipid\|peroxidation and the damage on cell membrane, thus, alleviated the inhibition on root growth and enhanced the drought resistance of the potato seedlings by increasing the anti\|oxidative enzymes activities, the root vigor, and optimizing of root morphology. |
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