Transcriptional regulation of 9-cis-epoxycarotenoid dioxygenase (NCED) gene by putrescine accumulation positively modulates ABA synthesis and drought tolerance in Lotus tenuis plants.

ESPASANDIN FABIANA D; MAIALE, SANTIAGO J; CALZADILLA, PABLO; RUIZ, OSCAR A.; SANSBERRO PEDRO A.

PLANT PHYSIOLOGY AND BIOCHEMISTRY

ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER

Lugar: Paris; Año: 2014 vol. 76 p. 29 - 35

0981-9428

Accumulation of putrescine and increased arginine decarboxylase activity (EC 4.1.1.19) levels in response to osmotic stress has been reported but the biological meaning of this increase remains unclear. To get a new insight into these questions, we have studied the response to drought of transgenic Lotus tenuis line expressing the oatADC gene driving by the stress-inducible pRD29A promoter. This line contains high levels of putrescine with no changes in spermidine and spermine content even under water deficit. Our results indicate that the biochemical and morphological response to dehydration correlates with Put level and provide evidences that Put controls the ABA content in response to drought by modulating ABA biosynthesis at the transcriptional level.