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Zygophyllum xanthoxylum  (Bunge) is a perennial woody succulent xerophyte that is one of the most drought-tolerant plant species identified to date. In this study, the gene encoding the novel C2H2-type zinc finger protein (ZFP)  ZxZF  was cloned from  Z. xanthoxylum  and expressed in both  Arabidopsis thaliana  and poplar  (Populus  ×  euramericana  cl. Bofeng 1) under the control of the drought-inducible promoter  rd29A . Overexpression in  Arabidopsis  resulted in a higher survival rate and enhanced root growth compared with wild type (WT) plants under osmotic stress conditions induced by mannitol. Overexpression in poplar under stress conditions induced by PEG6000 improved photosynthetic function as evidenced by a higher maximum photochemical activity of photosystem II (PSII)  (Fv/Fm)  and elevated chlorophyll content. Furthermore, leaf tissue of transgenic poplar accumulated less malondialdehyde (MDA), and both superoxide dismutase (SOD) and peroxidase (POD) activities were elevated in transgenic plants. These results suggest that  ZxZF  overexpression played an essential role in drought tolerance in both  Arabidopsis  and poplar. Incorporating overexpression of  ZxZF  and other A1 subgroup C2H2 zinc finger proteins in plant breeding programs may result in enhanced drought tolerance.

biologia

Overexpression of the novel  Zygophyllum xanthoxylum  C2H2-type zinc finger gene  ZxZF  improves drought tolerance in transgenic  Arabidopsis  and poplar