Biologia Plantarum

, Volume 58, Issue 4, pp 649–658 | Cite as

Over-expression of ApKUP3 enhances potassium nutrition and drought tolerance in transgenic rice

  • Z. -Z. Song
  • S. -Y. Yang
  • J. Zuo
  • Y. -H. SuEmail author
Original Papers


ApKUPs are typical high-affinity potassium (K+) transporters of Alternanthera philoxeroides which are involved in its response to K+ starvation and abiotic stresses. In this study, the overexpression of ApKUP3 gene in rice resulted in enhanced K+ nutrition and drought tolerance of transgenic plants. Compared with wild-type (WT) plants, the transgenic plants showed a better growth performance and a strengthened K+ accumulation under different K+ supplies. The ApKUP3 overexpression in the rice plants also enhanced tolerance to a drought stress, as evidenced by a reduced leaf water loss and an increased total leaf chlorophyll content, stomatal conductance, net photosynthetic rate, and activities of superoxide dismutase, peroxidase, and ascorbate peroxidase (APX). Moreover, the transcription of genes involved in the antioxidation defense system were higher in the transgenic plants than in the WT plants upon the drought stress.

Additional key words

Alternanthera philoxeroides antioxidant enzymes chlorophyll K+ transporter Oryza sativa photosynthesis stomatal conductance transgenic plant 



ascorbate peroxidase




stomatal conductance


K+ transporter/high-affinity K+ transporter/K+ uptake permease


net photosynthetic rate




real time quantitative polymerase chain reaction


superoxide dismutase


wild type


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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  • Z. -Z. Song
    • 1
    • 2
  • S. -Y. Yang
    • 2
    • 3
  • J. Zuo
    • 3
    • 4
  • Y. -H. Su
    • 2
    Email author
  1. 1.Institute of HorticultureJiangsu Academy of Agricultural SciencesNanjingP.R. China
  2. 2.State Key Laboratory of Soil and Sustainable AgricultureChinese Academy of SciencesNanjingP.R. China
  3. 3.University of the Chinese Academy of SciencesBeijingP.R. China
  4. 4.Key Laboratory of Plant Resources Conservation and Sustainable UtilizationChinese Academy of SciencesGuangzhouP.R. China

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