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This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact

Science: general issues --- Psychology --- positive psychology --- second language learning and acquisition --- third language learning and acquisition --- bilingualism and multilingualism --- bicultural bilinguals

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This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact

positive psychology --- second language learning and acquisition --- third language learning and acquisition --- bilingualism and multilingualism --- bicultural bilinguals

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Besides affecting the development of roots directly, the physical environment also influences the organisms associated with roots and thus affects their function. The papers presented in this volume pay equal attention to root development and root function in relation to the whole range of environmental factors including temperature, light, water, aeration, gravity and the mechanical strength of the soil. Consideration is also given to the effects of some of these factors on mycorrhizae and nitrogen-fixing bacteria. The final chapter reviews some of the main themes raised in the volume and indicates the way that research at the cellular and tissue levels may progress in the future.

Racine --- Roots --- Cytologie --- cytology --- Écologie --- ecology --- Développement biologique --- biological development --- Physiologie végétale --- Plant physiology --- Tissu végétal --- Plant tissues --- Rhizosphère --- Rhizosphere --- 581.144.2 --- Roots (Botany) --- -#WPLT:dd.prof.J.Vendrig --- Plant roots --- Plants --- Actinorhizas --- Mycorrhizas --- Plant cuttings --- Rootstocks --- Seedlings, Bareroot --- Roots. Subterranean nutrition organs --- Development --- -Congresses --- Rooting --- Plant and Crop Sciences. Botany --- Congresses. --- Plant Development --- Plant Development. --- 581.144.2 Roots. Subterranean nutrition organs --- #WPLT:dd.prof.J.Vendrig --- Development&delete& --- Congresses --- Rhizosphere. --- Seminar --- Proceedings --- Bangor university college

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Dumas, Alexandre [Fils]