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草业学报 ›› 2024, Vol. 33 ›› Issue (4): 87-98.DOI: 10.11686/cyxb2023184

• 研究论文 • 上一篇    下一篇

盐胁迫对不同种质小黑麦幼苗水分利用效率和渗透调节的影响

张译尹1(), 李雪颖1, 王斌1, 宋珂辰1, 兰剑1,2(), 胡海英1,2()   

  1. 1.宁夏大学林业与草业学院,宁夏 银川 750021
    2.宁夏草牧业工程研究中心,宁夏 银川 750021
  • 收稿日期:2023-05-31 修回日期:2023-06-15 出版日期:2024-04-20 发布日期:2024-01-15
  • 通讯作者: 兰剑,胡海英
  • 作者简介:E-mail: ndlanjian@163.com
    E-mail: haiying@nxu.edu.cn
    张译尹(1998-),女,甘肃定西人,在读硕士。E-mail: 2543378861@qq.com
  • 基金资助:
    宁夏重点研发计划(2019NYYZ0402);宁夏自然科学基金(2020AAC03080);宁夏高等学校一流学科建设(草学学科)项目(NXYLXK2017A01)

Effects of salt stress on water use efficiency and osmotic adjustment of seedlings of different triticale strains

Yi-yin ZHANG1(), Xue-ying LI1, Bin WANG1, Ke-chen SONG1, Jian LAN1,2(), Hai-ying HU1,2()   

  1. 1.College of Forestry and Grassland,Ningxia University,Yinchuan 750021,China
    2.Ningxia Grassland and Pasture Engineering Research Center,Yinchuan 750021,China
  • Received:2023-05-31 Revised:2023-06-15 Online:2024-04-20 Published:2024-01-15
  • Contact: Jian LAN,Hai-ying HU

摘要:

为探讨小黑麦幼苗经过盐胁迫后水分利用效率和渗透调节系统的响应机制,选用10份不同种质小黑麦为对象,以土壤含盐量0.6%NaCl为胁迫组,正常浇水为对照组(CK),研究盐胁迫对小黑麦生长、水分利用特征、渗透调节物质含量的影响,以明确不同种质小黑麦苗期耐盐能力的强弱,为宁夏地区耐盐小黑麦品种评价提供理论依据。结果表明:盐胁迫抑制小黑麦的正常生长,促进其水分利用效率和渗透调节物质的积累与转移。在盐胁迫下,X-520的株高最高,X-516次之,SD的分蘖数和地上生物量最多;此外,SD、X-520和X-516的稳定碳同位素(δ13C)含量较高,分别为-27.33‰、-27.40‰和-27.39‰;SD的脯氨酸、可溶性蛋白和淀粉含量均为最高。相关分析表明,δ13C与相对含水量、有机渗透调节物质、根系钠离子、叶片钾离子间均显著正相关(P<0.05)。通过聚类分析得出,不同种质小黑麦耐盐能力强弱可分为3类,耐盐性较好(SD、X-520、X-516),耐盐性一般(JIN、J-46),耐盐性较差(T-5、HN、T-9、XJ、T-11);同时,经主成分综合评价(PCA)得出不同种质小黑麦的耐盐性高低顺序依次为SD>X-520>X-516>J-46>JIN>HN>T-11>T-9>T-5>XJ。因此,建议将SD、X-516和X-520作为宁夏盐碱地推广种植的育种材料。

关键词: 小黑麦, δ13C值, 渗透调节, 耐盐性评价

Abstract:

In this study, we compared water use efficiency and the osmotic adjustment system among seedlings of 10 different triticale strains (SD, X-520, X-516, J-46, JIN, HN, T-11, T-9, T-5 and XJ) under salt stress. The salt-stressed group was grown in soil irrigated with salt water to reach a total salt content of 0.6% NaCl, and the control group was grown in soil with normal irrigation. The effects of salt stress on the growth, water use characteristics, and contents of osmotic adjustment substances in triticale were determined, and the different triticale strains were ranked on the basis of their salt tolerance. These analyses provided a theoretical basis for the evaluation of salt-tolerant triticale varieties in Ningxia. It was found that salt stress inhibited the normal growth of triticale, and promoted its water use efficiency and the accumulation and transfer of osmotic adjustment substances. Under salt stress, the highest value for plant height was in X-520, followed by X-516, and the highest values for tiller number and aboveground biomass were in SD. The stable carbon isotope (δ13C) contents were more in SD, X-520, and X-516 (-27.33, -27.40, and -27.39, respectively) than in the other triticale strains. The highest contents of proline, soluble protein, and starch were in SD. Correlation analyses showed that δ13C was significantly positively correlated with relative water content and the contents of organic osmotic adjustment substances, root sodium ions, and leaf potassium ions. The strains were ranked from most to least salt tolerant, as follows: SD>X-520>X-516>J-46>JIN>HN>T-11>T-9>T-5>XJ. Therefore, SD, X-516, and X-520 were identified as potential breeding materials to generate new triticale strains suitable for cultivation in saline-alkali land in Ningxia.

Key words: triticale, δ13C value, osmotic adjustment, salt tolerance evaluation