Artículos de revistas
Transcriptional regulation of 9-cis-epoxycarotenoid dioxygenase (NCED) gene by putrescine accumulation positively modulates ABA synthesis and drought tolerance in Lotus tenuis plants
Fecha
2014-01Registro en:
Espasandin, Fabiana Daniela; Maiale, Santiago Javier; Calzadilla, Pablo Ignacio; Ruiz, Oscar Adolfo; Sansberro, Pedro Alfonso; Transcriptional regulation of 9-cis-epoxycarotenoid dioxygenase (NCED) gene by putrescine accumulation positively modulates ABA synthesis and drought tolerance in Lotus tenuis plants; Elsevier Masson; Plant Physiology and Biochemistry; 76; 1-2014; 29-35
0981-9428
CONICET Digital
CONICET
Autor
Espasandin, Fabiana Daniela
Maiale, Santiago Javier
Calzadilla, Pablo Ignacio
Ruiz, Oscar Adolfo
Sansberro, Pedro Alfonso
Resumen
The accumulation of putrescine (Put) and increased arginine decarboxylase (ADC, EC 4.1.1.19) activity levels in response to osmotic stress has been reported; however, the biological meaning of this increase remains unclear. To obtain new insights into these questions, we studied the drought response of a transgenic Lotus tenuis line that expresses the oat ADC gene, which is driven by the stress-inducible pRD29A promoter. This line contains high levels of Put with no changes in spermidine and spermine contents, even under water deficits. Our results indicate that the biochemical and morphological responses to dehydration correlate with the Put level and provide evidence that Put controls the ABA content in response to drought by modulating ABA biosynthesis at the transcriptional level.