杨宏伟,柴强,李朝周,张俊莲.稀土微肥氯化镨调控马铃薯生长发育及抗旱的生理机制[J].干旱地区农业研究,2019,37(2):123~129
稀土微肥氯化镨调控马铃薯生长发育及抗旱的生理机制
Physiological mechanisms of potato growth and drought resistance regulated by rare-earth fertilizer PrCl3
  
DOI:10.7606/j.issn.1000-7601.2019.02.18
中文关键词:  稀土微肥  PrCl3  干旱胁迫  马铃薯  生理机制
英文关键词:rare-earth fertilizer  PrCl3  drought stress  potato  physiological mechanisms
基金项目:国家马铃薯产业体系(CARS-09-P14);甘肃省科技支撑项目(1604NKCA052-3)
作者单位
杨宏伟 College of Agronomy, Gansu Agricultural University/Gansu Provincial Key Laboratory of Arid Land Crop Science, Lanzhou, Gansu 730070, China 
柴强 College of Agronomy, Gansu Agricultural University/Gansu Provincial Key Laboratory of Arid Land Crop Science, Lanzhou, Gansu 730070, China 
李朝周 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 
张俊莲 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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中文摘要:
      为提高马铃薯抗旱性,选择增施适量的稀土微肥氯化镨水溶液,旨在探究氯化镨增强马铃薯抗旱性的生理机制。本试验以马铃薯品种“大西洋”为材料,以土壤质量含水量的32%~35%(Water-CK)、23%~25%(Water-1)和15%~18%(Water-2)为3个水分梯度,分别浇灌0、30、60、90、120 mg·L-1和150 mg·L-1 PrCl3水溶液,测定了苗期叶片叶绿素含量、可溶性糖含量、脯氨酸含量、丙二醛含量、抗氧化酶活性等生理生化指标及成熟期株高、茎粗等生长指标。结果表明:随土壤质量含水量的减少,马铃薯幼苗叶片可溶性糖、脯氨酸、MDA含量、相对电导率及SOD、POD和CAT活性显著上升,Water-2处理下,上述各指标较Water-CK分别升高了33.81%、101.12%、136.28%、46.11%、145.37%、59.84%和63.13%;马铃薯成熟期株高、茎粗、地上及地下部分干重、地上分枝数、单株薯重显著降低,Water-2处理下,上述各指标较Water-CK分别降低了3.91%、12.36%、30.17%、38.05%、30.00%和36.40%。在Water-2处理下,当PrCl3浓度为90 mg·L-1时,马铃薯叶片叶绿素、可溶性糖及脯氨酸含量分别较未增施PrCl3水溶液提高了162.35%、59.59%、154.45%,MDA 含量、O—[KG-1][JX*3]·[JX-*3]2产生速率及相对电导率分别降低了67.70%、25.29%、37.70%,抗氧化酶(SOD,POD,CAT)活性提高了38.35%、28.08%、66.00%,成熟期马铃薯株高、茎粗、地上及地下部分干重、地上分枝数、单株薯重分别增加了67.87%、21.68%、32.81%、49.05%、187.50%和63.91%。干旱胁迫下增施适量稀土微肥氯化镨可提高幼苗植株细胞内渗透调节物质含量,增强抗氧化酶活性,减少自由基的积累,缓解干旱胁迫对幼苗生长发育造成的损伤,提高植株生产力,增强抗旱性。
英文摘要:
      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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