Open main menu
Home
Random
Recent changes
Special pages
Community portal
Preferences
About Wikipedia
Disclaimers
Incubator escapee wiki
Search
User menu
Talk
Dark mode
Contributions
Create account
Log in
Editing
Plant hormone
(section)
Warning:
You are not logged in. Your IP address will be publicly visible if you make any edits. If you
log in
or
create an account
, your edits will be attributed to your username, along with other benefits.
Anti-spam check. Do
not
fill this in!
===Jasmonates=== [[File:Jasmonic acid.svg|thumb|Jasmonic acid|155px]] [[Jasmonates]] (JAs) are lipid-based hormones that were originally isolated from [[jasmine]] oil.<ref>{{cite journal | vauthors = Demole E, Lederer E, Mercier D | date = 1962 | title = Isolement et détermination de la structure du jasmonate de méthyle, constituant odorant caractéristique de l'essence de jasmin | trans-title = Isolation and determination of the structure of methyl jasmonate, a fragrant constituent characteristic of jasmine oil | language = fr |journal=Helvetica Chimica Acta |volume=45|issue=2|pages=675–685|doi=10.1002/hlca.19620450233 }}</ref> JAs are especially important in the plant response to attack from [[herbivore]]s and [[necrotrophic]] [[pathogen]]s.<ref name="Browse_2005">{{cite book | vauthors = Browse J | chapter = Jasmonate: an oxylipin signal with many roles in plants | volume = 72 | pages = 431–56 | date = 2005 | pmid = 16492478 | doi = 10.1016/S0083-6729(05)72012-4 | series = Vitamins & Hormones | isbn = 9780127098722 | title = Plant Hormones }}</ref> The most active JA in plants is [[jasmonic acid]]. Jasmonic acid can be further [[Metabolism|metabolized]] into [[methyl jasmonate]] (MeJA), which is a [[volatile organic compound]]. This unusual property means that MeJA can act as an airborne signal to communicate herbivore attack to other distant leaves within one plant and even as a signal to neighboring plants.<ref>{{cite journal | vauthors = Katsir L, Chung HS, Koo AJ, Howe GA | title = Jasmonate signaling: a conserved mechanism of hormone sensing | journal = Current Opinion in Plant Biology | volume = 11 | issue = 4 | pages = 428–35 | date = August 2008 | pmid = 18583180 | pmc = 2560989 | doi = 10.1016/j.pbi.2008.05.004 }}</ref> In addition to their role in defense, JAs are also believed to play roles in seed germination, the storage of protein in seeds, and root growth.<ref name="Browse_2005" /> JAs have been shown to interact in the signalling pathway of other hormones in a mechanism described as “crosstalk.” The hormone classes can have both negative and positive effects on each other's signal processes.<ref name="pmid16039901">{{cite journal | vauthors = Lorenzo O, Solano R | title = Molecular players regulating the jasmonate signalling network | journal = Current Opinion in Plant Biology | volume = 8 | issue = 5 | pages = 532–40 | date = October 2005 | pmid = 16039901 | doi = 10.1016/j.pbi.2005.07.003 }}</ref> [[Jasmonic acid methyl ester]] (JAME) has been shown to regulate genetic expression in plants.<ref name="pmid17513307">{{cite journal | vauthors = Wasternack C | title = Jasmonates: an update on biosynthesis, signal transduction and action in plant stress response, growth and development | journal = Annals of Botany | volume = 100 | issue = 4 | pages = 681–97 | date = October 2007 | pmid = 17513307 | pmc = 2749622 | doi = 10.1093/aob/mcm079 }}</ref> They act in signalling pathways in response to herbivory, and upregulate expression of defense genes.<ref name="Howe-2008">{{cite journal | vauthors = Howe GA, Jander G | date = 2008 | title = Plant Immunity to Insect Herbivores. | journal = Annu. Rev. Plant Biol. | volume = 59 | pages = 41–66 | doi = 10.1146/annurev.arplant.59.032607.092825 | pmid = 18031220 }}</ref> [[Jasmonyl-isoleucine]] (JA-Ile) accumulates in response to herbivory, which causes an upregulation in defense gene expression by freeing up transcription factors.<ref name="Howe-2008" /> Jasmonate mutants are more readily consumed by herbivores than wild type plants, indicating that JAs play an important role in the execution of plant defense. When herbivores are moved around leaves of wild type plants, they reach similar masses to herbivores that consume only mutant plants, implying the effects of JAs are localized to sites of herbivory.<ref name="pmid17561925">{{cite journal | vauthors = Paschold A, Halitschke R, Baldwin IT | title = Co(i)-ordinating defenses: NaCOI1 mediates herbivore- induced resistance in Nicotiana attenuata and reveals the role of herbivore movement in avoiding defenses | journal = The Plant Journal: For Cell and Molecular Biology | volume = 51 | issue = 1 | pages = 79–91 | date = July 2007 | pmid = 17561925 | doi = 10.1111/j.1365-313X.2007.03119.x | doi-access = free }}</ref> Studies have shown that there is significant crosstalk between defense pathways.<ref name="pmid17189328">{{cite journal | vauthors = Zarate SI, Kempema LA, Walling LL | title = Silverleaf whitefly induces salicylic acid defenses and suppresses effectual jasmonic acid defenses | journal = Plant Physiology | volume = 143 | issue = 2 | pages = 866–75 | date = February 2007 | pmid = 17189328 | pmc = 1803729 | doi = 10.1104/pp.106.090035 }}</ref>
Edit summary
(Briefly describe your changes)
By publishing changes, you agree to the
Terms of Use
, and you irrevocably agree to release your contribution under the
CC BY-SA 4.0 License
and the
GFDL
. You agree that a hyperlink or URL is sufficient attribution under the Creative Commons license.
Cancel
Editing help
(opens in new window)