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Titolo:
PHENOTYPIC PLASTICITY IN POLYGONUM-PERSICARIA .1. DIVERSITY AND UNIFORMITY IN GENOTYPIC NORMS OF REACTION TO LIGHT
Autore:
SULTAN SE; BAZZAZ FA;
Indirizzi:
WESLEYAN UNIV,DEPT BIOL MIDDLETOWN CT 06459 HARVARD UNIV,DEPT ORGANISM & EVOLUTIONARY BIOL CAMBRIDGE MA 02138
Titolo Testata:
Evolution
fascicolo: 4, volume: 47, anno: 1993,
pagine: 1009 - 1031
SICI:
0014-3820(1993)47:4<1009:PPIP.D>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
RAPHANISTRUM L BRASSICACEAE; SEED-WEIGHT VARIATION; SOLANUM-DULCAMARA L; QUANTITATIVE GENETICS; ENVIRONMENT INTERACTION; NATURAL-SELECTION; LIFE-HISTORY; PLANT TRAITS; COMPONENTS; EVOLUTION;
Keywords:
ANNUALS; CHARACTER CORRELATIONS; FITNESS; LIGHT RESPONSE; NORMS OF REACTION; PHENOTYPIC PLASTICITY; PHOTOSYNTHESIS; POLYGONUM PERSICARIA;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
115
Recensione:
Indirizzi per estratti:
Citazione:
S.E. Sultan e F.A. Bazzaz, "PHENOTYPIC PLASTICITY IN POLYGONUM-PERSICARIA .1. DIVERSITY AND UNIFORMITY IN GENOTYPIC NORMS OF REACTION TO LIGHT", Evolution, 47(4), 1993, pp. 1009-1031

Abstract

Several aspects of genotype-environment interaction may act to modulate natural selection in populations that encounter variable environments. In this study the norms of reaction (phenotypic responses) of 20 cloned genotypes from two natural populations of the annual plant Polygonum persicaria were determined over a broad range of controlled lightenvironments (8%- 100% full sun). These data reveal both the extent of functionally adaptive phenotypic plasticity expressed by individual genotypes, and the patterns of diversity among genotypes for characters relevant to fitness, in response to an environmental factor that is both highly variable within populations and critical to growth and reproduction. Each Polygonum genotype expressed a set of physiologically,allocationally, and morphologically diverse phenotypes in response tocontrasting light conditions. These phenotypic adjustments were consistent with ecophysiological expectations for maximizing light interception under low light intensities, and resulted in the maintenance of relative photosynthetic efficiency as well as successful reproduction even under severe light limitation. Within light levels, the different genotypes exhibited uniform responses in several characters related tolight capture. Genotypes differed significantly in other traits, but the differences were offset by negatively correlated differences in functionally related characters. As a result of the functional similarity of genotypes conferred by both phenotypic plasticity and interactionamong characters, morphologically diverse genotypes within each population shared equivalent reproductive fitnesses across the full range of flight environments. Enormous fitness differentials did result from light treatment itself, however. Such environmentally evoked fitness differences would act to promote the maintenance of genetic diversity within Polygonum populations.

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Documento generato il 12/07/20 alle ore 02:50:40