OsCPK9 Overexpression Improves Spikelet Fertility and Abiotic Stress Resistance
May 21, 2014| |
Calcium-dependent protein kinases (CDPKs) in plants are essential in its tolerance to abiotic stresses and in seed development. However, only a few rice CDPK functions have been known while and its role in spikelet fertility is still unclear.
A rice CDPK gene, OsCPK9, was cloned and characterized. It was then overexpressed in some individuals and was repressed, through RNA interference, in others. The results revealed the positive role the OsCPK9 plays in drought stress tolerance as well as in spikelet fertility. OsCPK9 improves drought stress tolerance through the enhancement of stomatal closure and by improving the plants' osmotic adjustment ability. It increases spikelet fertility through improvement of pollen viability.
Shoot and root elongation had enhanced sensitivity to ABA in OsCPK9-overexpressing plants compared to the wild-type. Overexpression and RNA interference of OsCPK9 affected both the transcript levels of ABA- and stress-responsive genes. These results revealed the positive effect of OsCPK9 in the regulation of abiotic stress tolerance, spikelt fertility and ABA sensitivity.
To learn more on this subject, please visit: http://www.biomedcentral.com/1471-2229/14/133/abstract
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