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. 1996 Dec;8(12):2325–2333. doi: 10.1105/tpc.8.12.2325

cGMP Is Required for Gibberellic Acid-Induced Gene Expression in Barley Aleurone.

S P Penson 1, R C Schuurink 1, A Fath 1, F Gubler 1, J V Jacobsen 1, R L Jones 1
PMCID: PMC161355  PMID: 12239379

Abstract

The occurrence and roles of cGMP were investigated in aleurone layers and protoplasts isolated from barley (cv Himalaya) grain. Levels of cGMP in freshly isolated barley aleurone layers ranged from 0.065 to 0.08 pmol/g fresh weight of tissue, and cGMP levels increased transiently after incubation in gibberellic acid (GA). Abscisic acid (ABA) did not increase cGMP levels in aleurone layers. LY 83583 (LY), an inhibitor of guanylyl cyclase, prevented the GA-induced increase in cGMP and inhibited GA-induced [alpha]-amylase synthesis and secretion. The inhibitory effects of LY could be overcome by membrane-permeant analogs of cGMP. LY also prevented GA-induced accumulation of [alpha]-amylase and GAMYB mRNAs. cGMP alone was not sufficient to induce the accumulation of [alpha]-amylase or GAMYB mRNA. LY had a less dramatic effect on the accumulation of mRNAs encoding the ABA-responsive gene Rab21. We conclude that cGMP plays an important role in GA, but not ABA, signaling in the barley aleurone cell.

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Selected References

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