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CIPK6, a CBL-interacting protein kinase is required for development and salt tolerance in plants.

Plant J.2009 Jun;58(5):778-90. Epub 2009 Feb 02
Vineeta Tripathi 1 , Boominathan Parasuraman , Ashverya Laxmi , Debasis Chattopadhyay
Vineeta Tripathi 1 , Boominathan Parasuraman , Ashverya Laxmi , Debasis Chattopadhyay

[No authors listed]

Author information
  • 1 National Institute for Plant Genome Research, Aruna Asaf Ali Marg, New Delhi, India.

摘要


Calcineurin B-like proteins (CBL) and CBL-interacting protein kinases (CIPK) mediate plant responses to a variety of external stresses. Here we report that Arabidopsis CIPK6 is also required for the growth and development of plants. Phenotype of tobacco plants ectopically expressing a homologous gene (CaCIPK6) from the leguminous plant chickpea (Cicer arietinum) indicated its functional conservation. A lesion inAtCIPK6 significantly reduced shoot-to-root and root basipetal auxin transport, and the plants exhibited developmental defects such as fused cotyledons, swollen hypocotyls and compromised lateral root formation, in conjunction with reduced expression of a number of genes involved in auxin transport and abiotic stress response. The Arabidopsis mutant was more sensitive to salt stress compared to wild-type, while overexpression of a constitutively active mutant of CaCIPK6 promoted salt tolerance in transgenic tobacco. Furthermore, tobacco seedlings expressing the constitutively active mutant of CaCIPK6 showed a developed root system, increased basipetal auxin transport and hypersensitivity to auxin. Our results provide evidence for involvement of a CIPK in auxin transport and consequently in root development, as well as in the salt-stress response, by regulating the expression of genes.

基因