Ethylene Signaling Influences Light-Regulated Development in Pea. Issue 1 (19th March 2015)

• Record Type: Journal Article
• Authors: Weller, James L.; Foo, Eloise M.; Hecht, Valérie; Ridge, Stephen; Vander Schoor, Jacqueline K.; Reid, James B.
• Is Part Of: Plant physiology. Volume 169:Issue 1(2015)
• Page Start: 115
• Page End: 124
• Publication Date: 2015-03-19
• Subjects: Plant physiology -- Periodicals; Botany -- Periodicals; Periodicals; Electronic journals; 571.2
• DOI: 10.1104/pp.15.00164
• Languages: English
• ISSNs: 0032-0889

Abstract

Abstract : A mutation that impairs ethylene response in pea reveals an interaction of light and ethylene signaling in the control of leaf expansion during deetiolation. Abstract: Plant responses to light involve a complex network of interactions among multiple plant hormones. In a screen for mutants showing altered photomorphogenesis under red light, we identified a mutant with dramatically enhanced leaf expansion and delayed petal senescence. We show that this mutant exhibits reduced sensitivity to ethylene and carries a nonsense mutation in the single pea ( Pisum sativum ) ortholog of the ethylene signaling gene ETHYLENE INSENSITIVE2 ( EIN2 ). Consistent with this observation, the ein2 mutation rescues the previously described effects of ethylene overproduction in mature phytochrome-deficient plants. In seedlings, ein2 confers a marked increase in leaf expansion under monochromatic red, far-red, or blue light, and interaction with phytochromeA, phytochromeB, and long1 mutants confirms that ein2 enhances both phytochrome- and cryptochrome-dependent responses in a LONG1 -dependent manner. In contrast, minimal effects of ein2 on seedling development in darkness or high-irradiance white light show that ethylene is not limiting for development under these conditions. These results indicate that ethylene signaling constrains leaf expansion during deetiolation in pea and provide further evidence that down-regulation of ethylene production may be an important component mechanism in the broader control of photomorphogenic development by phytochrome and cryptochrome.