Rice tolerance to suboptimal low temperatures relies on the maintenance of the photosynthetic capacity

GAZQUEZ, AYELÉN; VILAS, JUAN MANUEL; COLMAN LERNER, JORGE ESTEBAN; MAIALE, SANTIAGO JAVIER; CALZADILLA, PABLO IGNACIO; MENÉNDEZ, ANA BERNARDINA; RODRÍGUEZ, ANDRÉS ALBERTO

PLANT PHYSIOLOGY AND BIOCHEMISTRY

ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER

Lugar: Paris; Año: 2018 vol. 127 p. 537 - 552

0981-9428

The purpose of this research was to identify differences between two contrasting rice cultivars in their responseto suboptimal low temperatures stress. A transcriptomic analysis of the seedlings was performed and results werecomplemented with biochemical and physiological analyses. The microarray analysis showed downregulation ofmany genes related with PSII and particularly with the oxygen evolving complex in the sensitive cultivar IR50.Complementary studies indicated that the PSII performance, the degree of oxygen evolving complex couplingwith the PSII core and net photosynthetic rate diminished in this cultivar in response to the stress. However, thetolerant cultivar Koshihikari was able to maintain its energy equilibrium by sustaining the photosynthetic capacity.The increase of oleic acid in Koshihikari could be related with membrane remodelling of the chloroplastsand hence contribute to tolerance. Overall, these results work as a ground for future analyses that look forwardto characterize possible mechanisms to tolerate this stress.