Mar 15, 2016

Left-right leaf asymmetry in decussate and distichous phyllotactic systems

BioRxiv : the Preprint Server for Biology
Ciera C MartinezNeelima Sinha


Leaves in plants with spiral phyllotaxy exhibit directional asymmetries, such that all the leaves originating from a meristem of a particular chirality are similarly asymmetric relative to each other. Models of auxin flux capable of recapitulating spiral phyllotaxis predict handed auxin asymmetries in initiating leaf primordia with empirically verifiable effects on superficially bilaterally symmetric leaves. Here, we extend a similar analysis of leaf asymmetry to decussate and distichous phyllotaxy. We found that our simulation models of these two patterns predicted mirrored asymmetries in auxin distribution in leaf primordia pairs. To empirically verify the morphological consequences of asymmetric auxin distribution, we analyzed the morphology of a tomato sister-of-pinformed1a ( sopin1a ) mutant, entire-2 , in which spiral phyllotaxy consistently transitions to a decussate state. Shifts in the displacement of leaflets on the left and right sides of entire-2 leaf pairs mirror each other, corroborating predicted model results. We then analyze the shape of >800 common ivy ( Hedera helix ) and >3,000 grapevine ( Vitis and Ampelopsis spp. ) leaf pairs and find statistical enrichment of predicted mirrored asymmetries. Our results de...Continue Reading

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Mentioned in this Paper

Coat protein, grapevine fanleaf virus
Science of Morphology
Hedera helix

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