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Divergence in Patterns of Leaf Growth Polarity Is Associated with the Expression Divergence of miR396

Dasgupta, Mainak and Nath, Utpal (2015) Divergence in Patterns of Leaf Growth Polarity Is Associated with the Expression Divergence of miR396. In: PLANT CELL, 27 (10). pp. 2785-2799.

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Official URL: http://dx.doi.org/10.1105/tpc.15.00196


Lateral appendages often show allometric growth with a specific growth polarity along the proximo-distal axis. Studies on leaf growth in model plants have identified a basipetal growth direction with the highest growth rate at the proximal end and progressively lower rates toward the distal end. Although the molecular mechanisms governing such a growth pattern have been studied recently, variation in leaf growth polarity and, therefore, its evolutionary origin remain unknown. By surveying 75 eudicot species, here we report that leaf growth polarity is divergent. Leaf growth in the proximo-distal axis is polar, with more growth arising from either the proximal or the distal end; dispersed with no apparent polarity; or bidirectional, with more growth contributed by the central region and less growth at either end. We further demonstrate that the expression gradient of the miR396-GROWTH-REGULATING FACTOR module strongly correlates with the polarity of leaf growth. Altering the endogenous pattern of miR396 expression in transgenic Arabidopsis thaliana leaves only partially modified the spatial pattern of cell expansion, suggesting that the diverse growth polarities might have evolved via concerted changes in multiple gene regulatory networks.

Item Type: Journal Article
Publication: PLANT CELL
Additional Information: Copy right for this article belongs to the AMER SOC PLANT BIOLOGISTS, 15501 MONONA DRIVE, ROCKVILLE, MD 20855 USA
Department/Centre: Division of Biological Sciences > Microbiology & Cell Biology
Date Deposited: 17 Feb 2016 06:53
Last Modified: 05 Mar 2019 06:30
URI: http://eprints.iisc.ac.in/id/eprint/53262

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