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Annals of Botany 81: 405-411, 1998
© 1998 Annals of Botany Company

Direct and Maternal Effects of Elevated CO2on Early Root Growth of GerminatingArabidopsis thalianaSeedlings

CHRISTOPHE ANDALO, CHRISTIAN RAQUIN, NATHALIE MACHON, BERNARD GODELLE, and MARIANNE MOUSSEAU

Laboratoire d’Ecologie, Systématique et Evolution, URA CNRS 2154, Batiment 362, Université Paris Sud, 91405, Orsay Cedex, France Museum d’Histoire Naturelles, rue Buffon, Paris, France Institut National Agronomique Paris-Grignon, rue Claude Bernard, Paris, France

July 28, 1997 ; August 26, 1997 . November 14, 1997 .

Individuals ofArabidopsis thaliana, collected in different natural populations, were grown in controlled and elevated CO2in a glasshouse. Following germination, root growth of progeny of different lines of these populations was studied in control and elevated atmospheric CO2. No significant direct effect of atmospheric CO2concentration could be demonstrated on root growth. An important parental effect was apparent, namely that root length and branching were decreased in seeds collected from a mother plant which had been grown in elevated CO2. This was correlated with smaller seeds, containing less nitrogen. These parental effects were genetically variable. We conclude that CO2may affect plant fitness via parental effects on seed size and early root growth and that the genetic variability shown in our study demonstrates thatArabidopsispopulations will evolve in the face of this new selective pressure.Copyright 1998 Annals of Botany Company

Root growth, root branching, seed, elevated CO2, natural population,Arabidopsis thaliana, parental effect.


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