Restriction of nyctinastic movements and application of tensile forces to leaves affects diurnal patterns of expansion growth

Functional Plant Biology : FPB
Achim WalterUlrich Schurr

Abstract

Leaves of Ricinus communis L. show strong nyctinastic movements as well as diurnal variations of growth activity, combined with prominent basipetal gradients of relative growth rate. A novel technique, using digital image sequence processing, is able to resolve such spatio-temporal patterns of leaf growth with high resolution. In this paper we analyse the impact of prevention of nyctinastic movements, and the potential of tensile forces to overcome the retarding effects. Tensile forces affected leaf expansion and tissue expansibility in a dose-response relation. In a comparison with freely-growing leaves, an appropriate, optimal tensile force was identified that rebuilt the natural diurnal course of leaf expansion. With this tensile force, undisturbed patterns of temporal and spatial growth distribution as well as undisturbed concentrations of major cations, amino acids or soluble sugars were observed. However, diurnal fluctuations in starch content of almost fully-grown leaves were affected by the treatment and could not be compensated by tensile forces. This effect might point to a connection between diurnal growth variations of the leaf vein, biomechanical forces that synchronize growth within the vein, and metabolism of car...Continue Reading

Citations

Mar 20, 2010·Journal of Experimental Botany·Richard PoiréAchim Walter
Jan 29, 2016·Journal of Experimental Botany·Sebastian NagelmüllerAchim Walter
Jul 7, 2009·Annual Review of Plant Biology·Achim WalterUlrich Schurr
Sep 11, 2014·Journal of Experimental Botany·Shweta KalveGerrit T S Beemster
Jul 13, 2018·Biological Reviews of the Cambridge Philosophical Society·Peter V Minorsky
Jul 1, 2009·Functional Plant Biology : FPB·Andrzej Stefan CzechShizue Matsubara
Sep 2, 2005·Journal of Plant Research·Elizabeth A AinsworthUlrich Schurr
Jun 25, 2008·Physiologia Plantarum·Benjamin P DeRidder, Steven J Crafts-Brandner
Mar 16, 2005·Annals of Botany·Achim Walter, Ulrich Schurr
Jul 11, 2021·The New Phytologist·Jonas HiltySebastian Leuzinger

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