title: Multiple signals regulate nicotine synthesis in tobacco plant.
abstract: After wounding of tobacco plants, roots synthesize a large amount of nicotine to be transported to the shoot. Jasmonic acid (JA) acts as a long-distance signal between the wounding stimulus and response in tobacco plants. In addition, another phloem-mobile signal (auxin) plays a role in the transmission of the message triggered by wounding. Auxin can serve as a negative signal to regulate nicotine synthesis in roots of tobacco plants, even when plants are not wounded. Furthermore, removing the shoot apex after girdling the stem base still stimulates nicotine synthesis in roots. Since girdling prevented the involvement of signals transported in the phloem, this wound likely induced a response of nicotine synthesis in roots regulated by a signal transported via an alternative pathway. The results suggest that there are multiple signals in tobacco plant to regulate nicotine synthesis, depending on the treatment.
authors.affiliation: Key Laboratory of Plant Nutrition and Nutrient Cycling; Key Laboratory of Plant-Soil Interactions; Department of Plant Nutrition; China Agricultural University; Beijing China.
authors.forename: Chunjian
authors.initials: C
authors.lastname: Li
authors.forename: Wan
authors.initials: W
authors.lastname: Teng
authors.forename: Qiumei
authors.initials: Q
authors.lastname: Shi
authors.forename: Fusuo
authors.initials: F
authors.lastname: Zhang
references.citation: New Phytol. 1994 Sep;128(1):49-56
references.pmid: 33874540
references.citation: Plant Signal Behav. 2006 Jan;1(1):6-8
references.pmid: 19521469
references.citation: New Phytol. 1997 Nov;137(3):441-452
references.pmid: 33863078
references.citation: J Exp Bot. 2006;57(11):2899-907
references.pmid: 16868042
references.citation: Plant Physiol. 1992 Mar;98(3):859-67
references.pmid: 16668757
references.citation: Plant Physiol. 1994 Feb;104(2):439-444
references.pmid: 12232095
references.citation: Annu Rev Plant Biol. 2002;53:299-328
references.pmid: 12221978
references.citation: Plant Cell. 1990 Jun;2(6):569-79
references.pmid: 2152178
references.citation: PLoS Biol. 2004 Aug;2(8):E217
references.pmid: 15314646
references.citation: Plant Mol Biol. 1998 Dec;38(6):1101-11
references.pmid: 9869416
references.citation: Plant Cell Physiol. 1998 Feb;39(2):202-11
references.pmid: 9559563