https://www.ahs.ac.cn/images/0513-353X/images/top-banner1.jpg|#|苹果
https://www.ahs.ac.cn/images/0513-353X/images/top-banner2.jpg|#|甘蓝
https://www.ahs.ac.cn/images/0513-353X/images/top-banner3.jpg|#|菊花
https://www.ahs.ac.cn/images/0513-353X/images/top-banner4.jpg|#|灵芝
https://www.ahs.ac.cn/images/0513-353X/images/top-banner5.jpg|#|桃
https://www.ahs.ac.cn/images/0513-353X/images/top-banner6.jpg|#|黄瓜
https://www.ahs.ac.cn/images/0513-353X/images/top-banner7.jpg|#|蝴蝶兰
https://www.ahs.ac.cn/images/0513-353X/images/top-banner8.jpg|#|樱桃
https://www.ahs.ac.cn/images/0513-353X/images/top-banner9.jpg|#|观赏荷花
https://www.ahs.ac.cn/images/0513-353X/images/top-banner10.jpg|#|菊花
https://www.ahs.ac.cn/images/0513-353X/images/top-banner11.jpg|#|月季
https://www.ahs.ac.cn/images/0513-353X/images/top-banner12.jpg|#|菊花

Acta Horticulturae Sinica ›› 2025, Vol. 52 ›› Issue (10): 2761-2773.doi: 10.16420/j.issn.0513-353x.2024-0876

• Cultivation·Physiology & Biochemistry • Previous Articles     Next Articles

Effects of Exogenous Glutathione on Photosynthetic Characteristics of Leaf Lettuce Under High Temperature Stress

ZHOU Xiaolin, LIN Junxuan, LI Caixia, SUN Meihua, BAI Longqiang, HOU Leiping, MIAO Yanxiu*()   

  1. College of Horticulture,Shanxi Agricultural University,Shanxi Collaborative Innovation Center for Improving Quality and Efficiency of Facility Vegetables,Taigu,Shanxi 030801,China
  • Received:2025-04-14 Revised:2025-07-28 Online:2025-10-25 Published:2025-10-28
  • Contact: MIAO Yanxiu

Abstract:

Using leaf lettuce‘Glass lettuce’as the test material,this study analyzes the effects of different temperatures and different concentrations of exogenous glutathione(GSH)on leaf gas exchange parameters,chlorophyll fluorescence parameters,and expression levels of photosynthesis-related genes,investigating the impact of exogenous GSH on the photosynthetic characteristics of leaf lettuce under high-temperature stress. The results showed that high temperature stress(36 ℃/30 ℃)significantly reduced growth,photosynthetic rate(Pn),maximum photochemical efficiency(Fv/Fm),actual photochemical efficiency(ΦPSII),and leaf pigment content,but significantly increased the non-photochemical quenching coefficient(ΦNPQ),soluble protein content,and free amino acid content. That is high temperature stress significantly inhibited lettuce growth and reduced leaf photosynthetic efficiency and photosynthetic electron transport chain performance. However,under high temperature stress,foliar application of 0.5 and 1 mmol· L-1 GSH treatments significantly increased the whole-plant fresh weight,Pn,and ΦPSII of lettuce,significantly upregulated the expression levels of key genes(psbApsbBpsbDpsbHpsbKpsbN)encoding PSⅡ reaction center proteins in lettuce leaves. Additionally,the 0.5 mmol · L-1 GSH treatment significantly increased leaf pigment content and soluble sugar content. Therefore,applying exogenous GSH can effectively alleviate the adverse effects of high temperature stress on the photosynthetic characteristics of lettuce.

Key words: lettuce, leaf lettuce, high temperature stress, glutathione, photosynthetic characteristics, chlorophyll fluorescence parameters, gene expression