| Physiological mechanisms of potato growth and drought resistance regulated by rare-earth fertilizer PrCl3 |
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| DOI：10.7606/j.issn.1000-7601.2019.02.18 |
| Key Words: rare-earth fertilizer PrCl3 drought stress potato physiological mechanisms |
| Author Name | Affiliation | | YANG Hong-wei | College of Agronomy, Gansu Agricultural University/Gansu Provincial Key Laboratory of Arid Land Crop Science, Lanzhou, Gansu 730070, China | | CHAI Qiang | College of Agronomy, Gansu Agricultural University/Gansu Provincial Key Laboratory of Arid Land Crop Science, Lanzhou, Gansu 730070, China | | LI Chao-zhou | College of Life Science and Technology, Gansu Agricultural University,Lanzhou, Ganu 730070,China
Gansu Key Laboratory of Crop Genetics & Germplasm Enhancement, Lanzhou, Gansu 730070, China | | ZHANG Jun-lian | Gansu Key Laboratory of Crop Genetics & Germplasm Enhancement, Lanzhou, Gansu 730070, China
College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China |
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| Abstract: |
| In order to improve the drought resistance of potato and study the effects of rare-earth fertilizer PrCl3 on growth and physiological characters of potato under drought stress, the experiment used potato variety “Daxiyang” as material and 0，30，60，90，120 mg·L-1 and 150 mg·L-1 of PrCl3 solutions to treat the potato seedlings under 32%~35%（Water-CK）,23%~25%（Water-1）, and 15%~18%（Water-2）of different soil water contents. Some physiological and growth indexes were determined, including soluble sugar, proline, MDA contents, O—[KG-1][JX*3]·[JX-*3]2 production rate, relative conductivity, the activities of SOD, POD and CAT, plant height, stem diameter, aboveground and underground dry weight. The results showed that the contents of soluble sugar, proline, MDA, relative conductivity and the activities of antioxidant enzymes of potato seedlings enhanced with decreased soil water contents. Compared with Water-CK,under Water-2 treatments,soluble sugar, proline, MDA, relative conductivity, SOD, POD, and CAT increased by 33.81%，101.12%，136.28%，46.11%，145.37%，59.84% and 63.13%, respectively; plant height, stem diameter, aboveground and underground biomass, aboveground branches, and potato weight per plant decreased by 3.91%，12.36%，30.17%，38.05%，30.00% and 36.40%, respectively. In parallel with growth, 90 mg·L-1 PrCl3 application rate resulted in increase inchlorophyll, soluble sugar and proline contents by 162.35%, 59.59% and 154.45% in drought-stressed plants, respectively. The MDA contents, O—[KG-1][JX*3]·[JX-*3]2 production rate, and relative conductivity decreased by 67.70%, 25.29%, and 37.70%, respectively. Furthermore, the activities of antioxidant enzymes (SOD, POD, CAT)[JP] under drought stress were increased by 38.35%，28.08% and 66.00%. In maturity period, the plant height, stem diameter, aboveground and underground dry weight, branches, and potato weight per plant increased by 67.87%，21.68%，32.81%，49.05%，187.50% and 63.91%, respectively.The results indicated that exogenous Pr3+ is useful to improve the drought resistance of potato seedlings, which is most likely related to the increase in osmotic adjustment substance and antioxidant capacity, reduction in free radicals accumulation. |
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