4 years ago

Rice Phytoglobin regulate responses under low mineral nutrients and abiotic stresses in Arabidopsis thaliana

Suman Kundu, Girdhar K. Pandey, Alka Shankar, Manisha Sharma, Kanwaljeet Kaur, Joel Lars Fernandes
Just like animals, plants also contain haemoglobins (known as phytoglobins in plants). Plant phytoglobins (Pgbs) have been categorized into six different classes viz. Phytogb0 (Pgb0), Phytogb1 (Pgb1), Phytogb2 (Pgb2), SymPhytogb (sPgb), Leghemoglobin (Lb) and Phytogb3 (Pgb3). Among the 6 Phytogbs, sPgb and Lb have been functionally characterized and the understanding of roles of other Pgbs is still evolving. In our present study, we have explored the function of two rice Pgbs (OsPgb1.1 and OsPgb1.2). OsPgb1.1, OsPgb1.2, OsPgb1.3 and OsPgb1.4 displayed increased level of transcript upon salt, drought, cold and ABA treatment. The overexpression (OX) lines of OsPgb1.2 in Arabidopsis showed a tolerant phenotype in terms of better root growth in low potassium (K+) conditions. The expression of the known K+ gene markers such as LOX2, HAK5 and CAX3 was much higher in the OsPgb1.2 OX as compared to wild type (WT). Furthermore, the OsPgb1.2 OX-lines showed decrease in ROS production and conversely increase in the K+ content both in root and shoot as compared to WT in K+ limiting condition. Our results indicated the potential involvement of OsPgb1.2 in signalling networks triggered by the nutrient deficiency stresses.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1111/pce.13081

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