Competition Prolongs Expression of Maternal Effects in Seedlings of Erigeron annuus (Asteraceae)

The timing of expression of environmental maternal effects on seedling growth was investigated in greenhouse-grown populations of Erigeron annuus (Asteraceae). Maternal differences were generated in genetically identical lines grown under high and low nutrient conditions. There were significant diff...

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Veröffentlicht in:American journal of botany 1989-11, Vol.76 (11), p.1646-1653
1. Verfasser: Stratton, D. A.
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description The timing of expression of environmental maternal effects on seedling growth was investigated in greenhouse-grown populations of Erigeron annuus (Asteraceae). Maternal differences were generated in genetically identical lines grown under high and low nutrient conditions. There were significant differences among maternal families within genotypes for seed size, cotyledon size, number of leaves, and rosette diameter. When seedlings were grown individually, effects of the maternal fertilizer treatment on leaf number and rosette diameter were present early but could not be detected after eight weeks. When seedlings from HIGH and LOW lines were grown in competition, the maternal effects and the relative size advantage of seedlings from HIGH parents increased throughout the experiment. Most of the variation among nutrient treatments for seedling size characters could be explained by variation in initial seed size. In the competition experiment, the increasing magnitude of maternal environmental differences over time masked genetic variation for seedling characters; without competition, the relative contribution of genetic variation increased through time Under competitive conditions that generate persistent maternal effects on fitness, maternal environmental effects may retard natural selection.
doi_str_mv 10.1002/j.1537-2197.1989.tb15149.x
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Most of the variation among nutrient treatments for seedling size characters could be explained by variation in initial seed size. In the competition experiment, the increasing magnitude of maternal environmental differences over time masked genetic variation for seedling characters; without competition, the relative contribution of genetic variation increased through time Under competitive conditions that generate persistent maternal effects on fitness, maternal environmental effects may retard natural selection.</description><subject>Biological and medical sciences</subject><subject>Botany</subject><subject>Classical genetics, quantitative genetics, hybrids</subject><subject>Cotyledons</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>Genetic variation</subject><subject>Genetics of eukaryotes. 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A.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Competition Prolongs Expression of Maternal Effects in Seedlings of Erigeron annuus (Asteraceae)</atitle><jtitle>American journal of botany</jtitle><date>1989-11</date><risdate>1989</risdate><volume>76</volume><issue>11</issue><spage>1646</spage><epage>1653</epage><pages>1646-1653</pages><issn>0002-9122</issn><eissn>1537-2197</eissn><coden>AJBOAA</coden><abstract>The timing of expression of environmental maternal effects on seedling growth was investigated in greenhouse-grown populations of Erigeron annuus (Asteraceae). Maternal differences were generated in genetically identical lines grown under high and low nutrient conditions. There were significant differences among maternal families within genotypes for seed size, cotyledon size, number of leaves, and rosette diameter. 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subjects Biological and medical sciences
Botany
Classical genetics, quantitative genetics, hybrids
Cotyledons
Fundamental and applied biological sciences. Psychology
Genetic variation
Genetics of eukaryotes. Biological and molecular evolution
Genotypes
Germination
Maternal effect
Nutrient nutrient interactions
Plant growth
Plants
Pteridophyta, spermatophyta
Seed size
Seedlings
Seeds
Vegetals
title Competition Prolongs Expression of Maternal Effects in Seedlings of Erigeron annuus (Asteraceae)
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