Putative role of proteins involved in detoxification of reactive oxygen species in the early response to gravitropic stimulation of poplar stems.

摘要: Gravity perception and gravitropic response are essential for plant development. In herbaceous species it is widely accepted that one of the primary events in gravity involves displacement amyloplasts within specialized cells. However signaling cascade leading to stem reorientation not fully known especially woody which secondary growth occur. Several different second messengers proteins have been suggested be involved signal transduction gravitropism. Reactive oxygen (ROS) implicated as several hormone responses. It has shown ROS asymmetrically generated roots by gravistimulation regions reduced growth. Proteins detoxification defense were identified mass spectrometry: i.e., Thioredoxin h (Trx h), CuZn superoxide dismutase (CuZn SOD), ascorbate peroxidase (APX2), evolving enhancer 1 (OEE1), 2 (OEE2), ATP synthase. These differentially accumulated correspond analyzed at mRNA level. The levels showed expression patterns than those corresponding proteins, revealed transcription completely concomitant with translation. Our data these may play a role early stimulation.