4.7 Article

Leaf anatomy, photosynthesis and chlorophyll fluorescence of lettuce as influenced by arbuscular mycorrhizal fungi under high temperature stress

期刊

SCIENTIA HORTICULTURAE
卷 280, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.scienta.2021.109933

关键词

Arbuscular mycorrhizal fungi; High temperature; K-step; Photosynthetic pigment; Photosystem II

资金

  1. Major Scientific Innovation Project of Shandong Province [2019JZZY010715]
  2. Key Technology Research and Development Program of Shandong Province [2019GNC106043]
  3. Foundation for High-level Talents of QAU [1120098]

向作者/读者索取更多资源

Arbuscular mycorrhiza fungi can enhance lettuce tolerance to high temperature by improving photosynthesis and protecting the PSII system from heat damage.
In order to elucidate the mechanism of how arbuscular mycorrhiza (AM) fungi offer protection in lettuce (Lactuca sativa L.) from high temperature stress, the effects of mycorrhizal fungi, Funneliformis mosseae, on chloroplast ultrastructure, photosynthetic pigments, chlorophyll fluorescence of lettuce (cv. Shuangzi) grown under temperature at 25 degrees C and 35 degrees C, respectively, were investigated in this study. Results showed that non-AM lettuce grown under high temperature at 35 degrees C had damaged thylakoid organization and greater accumulation of starch granules, less chlorophyll contents and lowered net photosynthetic rate compared with those grown under 25 degrees C. However, chlorophyll a content, chlorophyll b content, net photosynthetic rate and transpiration rate of lettuce inoculated with F. mosseae grown under high temperature increased by 4.5 %, 4.5 %, 7.7 % and 5.9 %, respectively, compared with those grown without AM fungi. Under high temperature, a depression at the P-step was observed in chlorophyll fluorescence transient in non-AM lettuce, accompanied by a significant increase in L-step. The maximal fluorescence (F-m) of non-AM lettuce was reduced by 8.6 % as temperature increased from 25 degrees C to 35 degrees C, while no significant differences were observed in F-m between AM lettuce grown under temperature at 35 degrees C and non-AM lettuce grown under temperature at 25 degrees C. Absorption energy flux, dissipation energy flux and trapped energy flux per reaction center were increased with an decrease in quantum yield for electron transport (phi E-o) and performance index for energy conservation (PIabs) in lettuce grown under high temperature. However, opposite results were observed in lettuce inoculated with F. mosseae under high temperature. In conclusion, AM inoculaiton significantly improved lettuce tolerance to high temperature, by increasing photochemistry and preventing PSII system from heat damage.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据