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Titolo:
OPTIMAL DEFENSE, KIN CONFLICT AND THE DISTRIBUTION OF FURANOCOUMARINSAMONG OFFSPRING OF WILD PARSNIP
Autore:
ZANGERL AR; NITAO JK;
Indirizzi:
UNIV ILLINOIS,DEPT ENTOMOL,320 MORRILL HALL,505 S GOODWIN URBANA IL 61801 ARS,USDA,NEMATOL LAB BELTSVILLE MD 20705
Titolo Testata:
Evolutionary ecology
fascicolo: 4, volume: 12, anno: 1998,
pagine: 443 - 457
SICI:
0269-7653(1998)12:4<443:ODKCAT>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
PASTINACA-SATIVA L; SEED SIZE; SEXUAL SELECTION; GROWTH; GERMINATION; PLANTS; WEIGHT; MAIZE; UMBELLIFERAE; DEFLORATION;
Keywords:
DEFENSE; ENDOSPERM; FURANOCOUMARINS; KIN CONFLICT; PASTINACA SATIVA; SEEDS; WILD PARSNIP;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
48
Recensione:
Indirizzi per estratti:
Citazione:
A.R. Zangerl e J.K. Nitao, "OPTIMAL DEFENSE, KIN CONFLICT AND THE DISTRIBUTION OF FURANOCOUMARINSAMONG OFFSPRING OF WILD PARSNIP", Evolutionary ecology, 12(4), 1998, pp. 443-457

Abstract

The factors influencing the allocation of chemical defences to plant offspring have largely been unexplored, conceptually and experimentally. Because evolutionary interactions between maternal plants and theirprogeny can affect resource allocation patterns among sibling offspring, we suggest that kin conflict as well as herbivore-plant interaction theories need to be considered to predict chemical defence allocation patterns. Optimal defence theory predicts that maternal plants should defend more heavily those offspring in which resources have been disproportionately invested. In contrast, kin conflict theory predicts that natural selection will favour genotypes that can compete successfully for maternal defences irrespective of their quality, even at the expense of the fitness of siblings and the maternal plant. Evidence for these defence patterns were evaluated by examining the allocation of furanocoumarins to seeds of the wild parsnip (Pastinaca sativa, Apiaceae). Furanocoumarins are toxins that are localized within the oil tubesof the maternal tissues of seeds. We evaluated the role of offspring investment (endosperm mass) and seed genotype on furanocoumarin allocation by mating an array of pollen donors with pollen recipients. Furanocoumarins were found to be positively correlated with endosperm mass on one side of the seed, a result consistent with optimal defence theory; however, on the other side of the seed, furanocoumarin content wasinfluenced by seed genotype and was unrelated to endosperm mass. These effects varied with maternal plant. Further experiments demonstratedthat nearly 80% of furanocoumarin production occurs after pollination, when fertilization products are active. Although the amount of furanocoumarin influenced by the seed genotype is small relative to the total quantity in the seed, these furanocoumarins are the first line of defence against important predators, such as the parsnip webworm, Depressaria pastinacella (Lepidoptera: Oecophoridae). We found that parsnipwebworm larvae were able to discriminate among genotypes within an inflorescence. In line with previous studies, these results suggest thata genotype's ability to influence furanocoumarin defence may a?ect its probability of survival. We conclude that the distribution of defences among plant offspring in wild parsnip is probably influenced by competition among seed genotypes that conflicts with maternal optimal defence.

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Documento generato il 27/11/20 alle ore 12:58:15