The role of isoprene in insect herbivory.
Several hypotheses have previously been proposed to explain the function of isoprene in plants, including its ability to protect the leaf metabolic machinery from transient high temperature1,2 and from oxidative stress.3 Isoprene may also serve as a metabolic overflow mechanism for carbon or photosynthetic energy4-6 and may promote flowering in neighbouring plants.7 We have reported recently that isoprene can be detected by a herbivore, Manduca sexta, and that it directly deters them from feeding, with an isoprene emission threshold level of <6 nmol m(-2) s(-1).8 We demonstrated this using both in vivo experiments, using isoprene-emitting transgenic tobacco plants (Nicotiana tabacum cv. Samsun) and non-emitting azygous control plants, and in vitro experiments, using an artificial (isoprene-emitting and non-emitting control) diet. Here we discuss the potential role of isoprene in plant-herbivore interactions and the possibility that isoprene actually serves multiple purposes in plants.
Laothawornkitkul
Jullada
J
Lancaster Environment Centre; Lancaster University; Lancaster UK.
Paul
Nigel D
ND
Vickers
Claudia E
CE
Possell
Malcolm
M
Mullineaux
Philip M
PM
Hewitt
C Nicholas
CN
Taylor
Jane E
JE
Annu Rev Plant Physiol Plant Mol Biol. 2001 Jun;52:407-436
11337404
Plant Biol (Stuttg). 2004 Jan-Feb;6(1):12-21
15095130
Oecologia. 1999 Feb;118(2):109-123
28307685
Trends Plant Sci. 2000 Nov;5(11):477-81
11077256
Plant Cell Environ. 2008 Oct;31(10):1410-5
18643955
Ann Bot. 2008 Jan;101(1):5-18
17921528
J Chem Ecol. 1994 Jun;20(6):1281-328
24242341
J Chem Ecol. 1988 Feb;14(2):561-79
24276002
Plant Physiol. 2007 Jun;144(2):1066-78
17468218
Plant J. 2007 Aug;51(3):485-99
17587235
Plant Physiol. 2001 Jul;126(3):993-1000
11457950
Plant Physiol. 2005 Feb;137(2):700-12
15653811