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Titolo:
PHYSIOLOGICAL PRICE OF AN INDUCED CHEMICAL DEFENSE - PHOTOSYNTHESIS, RESPIRATION, BIOSYNTHESIS, AND GROWTH
Autore:
ZANGERL AR; ARNTZ AM; BERENBAUM MR;
Indirizzi:
UNIV ILLINOIS,DEPT ENTOMOL,320 MORRILL HALL,505 S GOODWIN URBANA IL 61801 UNIV ILLINOIS,DEPT PLANT BIOL URBANA IL 61801
Titolo Testata:
Oecologia
fascicolo: 3, volume: 109, anno: 1997,
pagine: 433 - 441
SICI:
0029-8549(1997)109:3<433:PPOAIC>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
FURANOCOUMARIN INDUCTION; PLANT CHEMISTRY; WILD PARSNIP; TRANSDUCTION; HERBIVORES; METABOLISM; RESPONSES; TOXICITY; PATTERNS; SIGNAL;
Keywords:
PASTINACA SATIVA; FURANOCOUMARINS; DEFENSE; COST; INDUCTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
36
Recensione:
Indirizzi per estratti:
Citazione:
A.R. Zangerl et al., "PHYSIOLOGICAL PRICE OF AN INDUCED CHEMICAL DEFENSE - PHOTOSYNTHESIS, RESPIRATION, BIOSYNTHESIS, AND GROWTH", Oecologia, 109(3), 1997, pp. 433-441

Abstract

A recurring theme in defense allocation theories is that defenses arecostly. Most studies that attempt to quantify a cost of defense seek to establish a trade-off between a component of plant fitness and the level of a constitutive defense. Such estimates are ambiguous because they cannot discount the cost of traits that are correlated with defense but are not themselves defensive. We examined the effects of damage-induced synthesis of furanocoumarins, known defense compounds, on thegrowth of wild parsnip. Plants that had 2% of their leaf area removedaccumulated 8.6% less total biomass and 14% less root biomass than intact plants over a 4-week period. We also found that this small amountof leaf damage significantly reduced net photosynthetic rates 0.5 h after damage; the effect was temporary, as photosynthetic rates were nolonger significantly different after 45 h. Lastly, we found that increases in respiration rates associated with damage coincided spatially and temporally with increases in furanocoumarin production, and that respiration increases were phenotypically correlated with furanocoumarin production. When damage-induced changes in furanocoumarin content and respiration rates were expressed in glucose equivalents and compared, the energ istic cost of furanocoumarin production (12.6 mu g glucosecm(-2)) accounted for all of the increase in respiration (12.0 mu g glucose cm(-2)). A comparison of other secondary compounds in damaged and intact leaflets revealed that myristicin, a furanocoumarin synergist, is the only other compound aside from furanocoumarins that is inducible. The inducible defense system of wild parsnip thus appears to involve a small subset of secondary compounds. Synthesis of these compounds is tightly linked to damage-induced rates of respiration. Because the negative impact that damage had on the rate of net photosynthesis was short-lived, the impact of damage on growth observed in this study was likely due to the cost of furanocoumarin synthesis elicited by damage rather than the loss of photosynthetic tissue caused by damage.

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Documento generato il 30/11/20 alle ore 06:25:43