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Acta Prataculturae Sinica ›› 2024, Vol. 33 ›› Issue (5): 128-142.DOI: 10.11686/cyxb2023236

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Functional analysis of the R2R3-MYB transcription factor CiMYB4 of Chrysanthemum indicum var. aromaticum in response to cadmium stress

Qiang LI(), Fan KANG, Qing XUE, Bin CHEN, Ying SUN()   

  1. Department of Landscape Architecture,Northeast Forestry University,Harbin 150040,China
  • Received:2023-07-12 Revised:2023-09-21 Online:2024-05-20 Published:2024-02-03
  • Contact: Ying SUN

Abstract:

The aim of this study was to explore the role of CiMYB4 in the response to cadmium stress. In hydroponic experiments, wild-type (WT) plants and CiMYB4-overexpressing tobacco (Nicotiana tabacum) (CiMYB4-S) and chrysanthemum (Chrysanthemum indicum) (CiMYB4-OE) as well as chrysanthemum with RNAi-silenced CiMYB4CiMYB4-Ri) were subjected to cadmium treatments. Growth-related indexes, antioxidant enzyme activities, photosynthetic indexes, cadmium contents in above-ground and roots, and the transcript levels of cadmium tolerance-related genes (PCS1GSH1ABCC1, and HMA3) were determined.After cadmium treatments, compared with WT, CiMYB4-S and CiMYB4-OE showed significantly greater root length, stem diameter, plant height, leaf length, and leaf width; showed lower malondialdehyde content and higher superoxide dismutase activity, peroxidase activity, and catalase activity, higher values for photosynthetic parameters; and showed significantly increased chlorophyll content, stronger cadmium enrichment and transport, and significantly higher transcript levels of PCS1GSH1, and HMA3. In contrast, compared with WT, CiMYB4-Ri had significantly lower plant height and above-ground dry weight; higher malondialdehyde content, lower superoxide dismutase, peroxidase, and catalase activities, lower photosynthetic parameter values; significantly lower chlorophyll content; reduced cadmium enrichment and transport ability; and significantly lower transcript levels of PCS1GSH1, and HMA3. These results indicate that CiMYB4 is involved in the response to cadmium stress, and its overexpression in transgenic tobacco and chrysanthemum can significantly improve their cadmium tolerance.

Key words: Chrysanthemum indicum var. aromaticum, CiMYB4, transgenic tobacco, transgenic Chrysanthemum indicum, cadmium stress