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中国沙漠 ›› 2026, Vol. 46 ›› Issue (4): 193-203.DOI: 10.7522/j.issn.1000-694X.2026.00058

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外源脱落酸对盐胁迫下沙木蓼( Atraphaxis bracteata )幼苗生长及生理的影响

刘源1(), 种培芳1(), 何彩2(), 晋敏2, 胡芳2, 张德1   

  1. 1.甘肃农业大学 林学院,甘肃 兰州 730000
    2.武威市林业科学研究院,甘肃 武威 733000
  • 收稿日期:2025-11-15 修回日期:2026-04-07 出版日期:2026-07-20 发布日期:2026-08-27
  • 通讯作者: 种培芳,何彩
  • 作者简介:刘源(2000—),男,甘肃定西人,博士研究生,从事植物逆境生理生态研究。E-mail: 1169321037@qq.com
  • 基金资助:
    甘肃省科技重大专项(25ZDWA007);甘肃省国土空间生态修复适宜植物应用试验示范项目;甘肃省科技计划资助优秀博士项目(25JRRA389);甘肃省研究生创新之星项目(2025CXZX-831);甘肃省科技计划项目(25JRRH004);甘肃省科技计划项目(24JRRH007);武威市科技计划项目(WW24B01NY045)

Effects of exogenous abscisic acid on the growth and physiological traits of Atraphaxis bracteata seedlings under salt stress

Yuan Liu1(), Peifang Chong1(), Cai He2(), Min Jin2, Fang Hu2, De Zhang1   

  1. 1.Forestry College,Gansu Agricultural University,Lanzhou 730000,China
    2.Wuwei Academy of Forestry,Wuwei 733000,Gansu,China
  • Received:2025-11-15 Revised:2026-04-07 Online:2026-07-20 Published:2026-08-27
  • Contact: Peifang Chong, Cai He

摘要:

盐胁迫对植物的生长发育有明显抑制作用,而适宜浓度的脱落酸可以有效缓解盐胁迫对植物造成的损伤。本研究以沙木蓼幼苗为材料,采用盆栽试验方法,以不施加外源脱落酸对照(CK),探究150 mmol·L-1 NaCl胁迫下施加不同浓度(2.5、5、7.5、10、15 mg·L-1)外源脱落酸对沙木蓼(Atraphaxis bracteata)幼苗各器官生长及生理影响,从而筛选出能在盐胁迫下也可促进沙木蓼生长的适宜脱落酸浓度。结果显示:低浓度脱落酸通过降低丙二醛含量来缓解盐胁迫伤害。5 mg·L-1处理下,沙木蓼幼苗各器官丙二醛含量最低,其中根部较CK降低38.46%,茎部降低34.78%,叶部降低26.25%。高浓度脱落酸处理使可溶性糖和淀粉含量显著上升,15 mg·L-1时幼苗根部可溶性糖含量较CK增长61.19%,茎部和叶部可溶性糖含量均达最高;根部淀粉含量较CK增长36.01%,茎部增长48.61%,叶部增长51.48%。这表明低浓度脱落酸(2.5、5 mg·L-1)可有效缓解盐胁迫对沙木蓼幼苗的伤害,而高浓度脱落酸(15 mg·L-1)对盐胁迫的缓解能力下降,甚至抑制幼苗生长。主成分分析显示,丙二醛含量、干鲜重、脯氨酸含量、淀粉含量和超氧化物歧化酶活性可作为外源脱落酸对沙木蓼盐胁迫缓解能力的主要鉴定指标。运用隶属函数对沙木蓼幼苗根、茎、叶的10个指标进行综合评价,结果表明,施加5 mg·L-1的外源脱落酸溶液时,各器官平均隶属度最高,分别为0.97、0.93和0.73,说明该浓度的外源脱落酸对沙木蓼耐盐性的调控能力最强。

关键词: 沙木蓼(Atraphaxis bracteata), 脱落酸, 盐胁迫, 生理指标, 主成分分析

Abstract:

Salt stress has a significant inhibitory effect on plant growth and development, while an appropriate concentration of abscisic acid (ABA) can effectively alleviate the damage caused by salt stress. In this study, Atraphaxis bracteata seedlings were used as the experimental material, and a pot experiment was conducted to investigate the effects of applying different concentrations (2.5, 5, 7.5, 10, 15 mg·L-1, with 0 as CK) of exogenous ABA on the growth and physiological responses of various organs of A. bracteata seedlings under 150 mmol·L-1 NaCl stress. The goal was to identify the suitable concentration of ABA that can promote A. bracteata growth even under salt stress. The results showed that low-concentration abscisic acid alleviated salt stress damage by reducing malondialdehyde content. Under the 5 mg·L-1 treatment, the malondialdehyde content in all organs of A. bracteata was the lowest, with a 38.46% decrease in roots, 34.78% in stems, and 26.25% in leaves compared to CK. In contrast, high-concentration abscisic acid treatment significantly increased soluble sugar and starch content. At 15 mg·L-1, the soluble sugar content in roots increased by 61.19% compared to CK, while the levels in stems and leaves reached their highest. The starch content in roots increased by 36.01%, in stems by 48.61%, and in leaves by 51.48%. This indicates that low-concentration abscisic acid (2.5, 5 mg·L-1) effectively mitigates salt stress damage in A. bracteata, whereas high-concentration abscisic acid (15 mg·L-1) reduces its mitigating capacity and even inhibits seedling growth. Principal component analysis showed that malondialdehyde content, dry and fresh weight, proline content, starch content, and superoxide dismutase activity can serve as the main indicators for evaluating the alleviating effect of exogenous ABA on salt stress in A. bracteata. Using membership functions to perform a comprehensive evaluation of 10 indicators in three organs of the seedlings showed that a 5 mg·L-1 exogenous ABA solution had the highest average membership degree in each organ, at 0.97, 0.93, and 0.73 respectively, indicating that this concentration of exogenous ABA had the strongest regulatory ability on salt tolerance in A. bracteata. These research results provide a theoretical basis for salt-tolerant cultivation of A. bracteata and have important implications for improving desert environments and promoting sustainable agricultural development.

Key words: Atraphaxis bracteata, abscisic acid, salt stress, physiological index, principal component analysis

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