生物技术进展 ›› 2025, Vol. 15 ›› Issue (4): 675-682.DOI: 10.19586/j.2095-2341.2025.0066

• 研究论文 • 上一篇    

壳寡糖缓解娃娃菜幼苗盐胁迫的生理及光合响应

鄂利锋1(), 李亚妮1, 谢钰2, 权建华1, 陈修斌1, 华军3, 赵雪梅4, 赵文勤5   

  1. 1.河西学院农业与生态工程学院,甘肃 张掖 734000
    2.高台县良种繁育推广中心,甘肃 高台 734300
    3.张掖市经济作物技术推广站,甘肃 张掖 734000
    4.甘州区农业技术推广中心,甘肃 甘州 734000
    5.甘肃华美农业科技有限公司,甘肃 张掖 734000
  • 收稿日期:2025-05-26 接受日期:2025-06-13 出版日期:2025-07-25 发布日期:2025-09-08
  • 作者简介:鄂利锋 E-mail: hxxyelf@163.com
  • 基金资助:
    甘肃省科技计划(技术创新引导计划)项目(24CXNG006);甘肃省农业农村厅农业科技支撑项目(KJZC-2024-27)

Physiological and Photosynthetic Responses of Brassica pekinensis Seedlings to Salt Stress Alleviation by Chitosan Oligosaccharide

Lifeng E1(), Yani LI1, Yu XIE2, Jianhua QUAN1, Xiubin CHEN1, Jun HUA3, Xuemei ZHAO4, Wenqin ZHAO5   

  1. 1.College of Agriculture and Ecological Engineering,Hexi University,Gansu Zhangye 734000,China
    2.Gaotai County Elite Seed Breeding and Extension Center,Gansu Gaotai 734300,China
    3.Zhangye Economic Crops Technology Extension Station,Gansu Zhangye 734000,China
    4.Ganzhou District Agricultural Technology Extension Center,Gansu Ganzhou 734000,China
    5.Gansu Huamei Agricultural Technology Co. ,Ltd. ,Gansu Zhangye 734000,China
  • Received:2025-05-26 Accepted:2025-06-13 Online:2025-07-25 Published:2025-09-08

摘要:

为探究壳寡糖(chitooligosaccharides,COS)对盐胁迫下娃娃菜幼苗生理特性的调控作用,以“耐寒金皇后”娃娃菜为材料,将0(CK)、50、100、150、200 mg·L-1 COS喷施叶面4 d后,用150 mmol·L-1 NaCl溶液对娃娃菜幼苗进行胁迫处理。结果发现,100 mg·L-1 COS处理显著提高了NaCl胁迫下娃娃菜幼苗的株高和单株干重,增幅分别达14.44%和88.06%,同时显著提升抗氧化酶——过氧化物酶(peroxidase,POD)和过氧化氢酶(catalase,CAT)的活性,增幅分别为16.41%和33.77%,而丙二醛(malondialdehyde,MDA)含量显著下降;叶片净光合速率(Pn)、蒸腾速率(Tr)及气孔导度(Gs)显著提升,分别提高了28.26%、41.67%和15.90%,而胞间CO?浓度(Ci)显著降低,脯氨酸含量显著增加。结果表明,100 mg·L-1 COS可通过增强抗氧化防御能力和光合效能,有效缓解盐胁迫对娃娃菜幼苗的伤害,为高原夏菜抗逆栽培提供了理论依据和技术支撑。

关键词: 壳寡糖, 娃娃菜, 盐胁迫, 生理特性, 光合参数

Abstract:

To investigate the regulatory effects of chitooligosaccharides (COS) on physiological characteristics of Brassica pekinensis seedlings under salt stress, the cultivar "Cold-tolerant Golden Empress" was used. Seedlings were foliar sprayed with 0 (CK), 50, 100, 150, or 200 mg·L-1 COS for 4 days and then subjected to salt stress with 150 mmol·L-1 NaCl. The results showed that the 100 mg·L-1 COS treatment significantly increased plant height and dry weight per plant under NaCl stress, increasing by 14.44% and 88.06%, respectively. It also significantly enhanced the activities of antioxidant enzymes peroxidase (POD) and catalase (CAT) by 16.41% and 33.77%, respectively, while significantly reducing malondialdehyde (MDA) content. Furthermore, the net photosynthetic rate (Pn), transpiration rate (Tr), and stomatal conductance (Gs) of the leaves were significantly increased by 28.26%, 41.67%, and 15.90%, respectively, whereas intercellular CO2 concentration (Ci) was significantly reduced. Proline content also increased significantly. These results indicated that 100 mg·L-1 COS effectively alleviates salt stress-induced damage in Brassica pekinensis seedlings by enhancing antioxidant defense and photosynthetic efficiency, providing a theoretical basis and technical support for stress-resistant cultivation of highland summer vegetables.

Key words: chitooligosaccharide, Brassica pekinensis, salt stress, physiological characteristics, photosynthetic parameters

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