| 不同耐盐性燕麦对盐胁迫的生理响应 |
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| 引用本文： | 王苗苗,赵桂琴,梁国玲,柴继宽,李娟宁,周向睿.不同耐盐性燕麦对盐胁迫的生理响应[J].草业科学,2022,1(1):2200-2209. |
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| 作者姓名： | 王苗苗 赵桂琴 梁国玲 柴继宽 李娟宁 周向睿 |
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| 作者单位： | 甘肃农业大学草业学院,/,草业生态系统教育部重点实验室,/,中－美草地畜牧业可持续发展研究中心,甘肃,兰州,730070;青海大学畜牧兽医科学院,/,青海省畜牧兽医科学院,/,青海省青藏高原优良牧草种质资源利用重点实验室,青海,西宁,810016 |
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| 基金项目： | 甘肃省科技重大专项计划(19ZD2NA002)%青海省青藏高原优良牧草种质资源利用重点实验室开放课题(2020-ZJ-Y03)%甘肃农业大学学科建设专项基金(GAU-XKJS-2018-010) |
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| 摘 要： | 为研究不同耐盐性燕麦(Avena sativa)对盐胁迫的生理响应，以青永久195 (耐盐材料)和709 (盐敏感材料)为试验材料，采用营养液沙培法，对3周龄燕麦幼苗进行150 mmol·L?1 NaCl处理0 (CK)、6、24、72 h，探讨了盐胁迫对两种燕麦幼苗光合作用、抗氧化特性、渗透调节物质含量的影响。结果表明：随着处理时间的延长，燕麦幼苗叶片的叶绿素含量、净光合速率(net photosynthetic rate, Pn)、蒸腾速率(transpiration rate, Tr)、气孔导度(stomatal conductance, Gs)、胞间二氧化碳浓度(intercellular carbon dioxide concentration, Ci)、K+含量均有所下降；过氧化物酶(peroxidase, POD)、超氧化物歧化酶(superoxide dismutase, SOD)活性、脯氨酸和可溶性糖含量呈先升高后降低的趋势，过氧化氢酶(catalase, CAT)活性、丙二醛(malondialdehyde, MDA)和Na+含量均有所增加。其中在盐胁迫下耐盐材料青永久195叶片的叶绿素含量、Pn、Tr和Gs下降幅度小于盐敏感材料709；SOD、CAT、脯氨酸含量和可溶性糖含量均高于709，MDA含量低于709。盐胁迫6、24 h时，青永久195根中K+、Na+含量低于709，72 h时高于709；盐胁迫6和24 h时，青永久195叶中K+含量高于709，Na+含量低于709。综上，耐盐材料青永久195表现出较好的渗透调节能力，维持较高的抗氧化酶活性和生物膜稳定性。
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| 关 键 词： | 燕麦 盐胁迫 光合作用 抗氧化特性 丙二醛含量 渗透调节 生理响应 |
Physiological response of different salt-tolerant oats to salt stress |
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| WANG Miaomiao,ZHAO Guiqin,LIANG Guoling,CHAI Jikuan,LI Juanning,ZHOU Xiangrui.Physiological response of different salt-tolerant oats to salt stress[J].Pratacultural Science,2022,1(1):2200-2209. |
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| Authors: | WANG Miaomiao ZHAO Guiqin LIANG Guoling CHAI Jikuan LI Juanning ZHOU Xiangrui |
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| Abstract: | This study aimed to investigate the physiological response of different salt-tolerant oats to salt stress, using Qingyongjiu 195 (salt-tolerant) and 709 (salt-sensitive) as test materials. Three-week-old oat seedlings grown in sand culture were treated with Hoagland nutrition containing 150 mmol·L?1 NaCl for 0 (CK), 6, 24, and 72 h, and the effects of salt stress on photosynthesis, antioxidant properties, and osmotic regulation of the two oat seedlings were investigated. The results showed that the chlorophyll content, net photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductance (Gs), intercellular carbon dioxide concentration (Ci), and K+ content of oat seedling leaves showed a decreasing trend with the extension of treatment time. The trend of peroxidase (POD), superoxide dismutase (SOD) activity, proline, and soluble sugar content first increased and then decreased, while other indices, including catalase (CAT) activity, malondialdehyde (MDA), and Na+ content showed an increasing trend. Under salt stress, the range of descent of chlorophyll content, Pn, Tr, and Gs in salt-tolerant Qingyongjiu 195 was less than that in salt-sensitive 709, whereas its SOD, CAT, proline content, and soluble sugar content were higher than that in 709, and MDA content was lower than that in 709. After salt stress at 6 and 24 h, the contents of K+ and Na+ in the roots of Qingyongjiu 195 were lower than that in 709, and higher than that in 709 at 72 h. After salt stress at 6 and 24 h, the content of K+ in the leaves of Qingyongjiu 195 was higher than in 709, whereas the content of Na+ was lower than that in 709. Overall, our study showed that salt-tolerant Qingyongjiu 195 possessed superior adjustment ability, antioxidant enzyme activity, and biofilm stability. |
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| Keywords: | oat salt stress photosynthesis antioxidant properties malondialdehyde content osmotic regulation physiological response |
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