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Auxin transport in the evolution of branching forms
Author(s) -
Harrison C. Jill
Publication year - 2017
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/nph.14333
Subject(s) - auxin , sporophyte , polar auxin transport , bryophyte , gametophyte , biology , botany , moss , branching (polymer chemistry) , flowering plant , arabidopsis , microbiology and biotechnology , mutant , chemistry , genetics , gene , organic chemistry , pollen
ContentsSummary 545 I. Diversification of branching forms in land plants 545 II. Roles for auxin transport in branching 546 III. Mechanisms for auxin transport in branching 546 IV. PIN‐mediated polar auxin transport is a conserved regulator of branching in vascular plants 548 V. Axial auxin transport is nonpolar or weakly polar in liverwort and hornwort sporophytes, and bryophyte gametophytes 548 VI. Apical dominance without PIN‐mediated polar auxin transport in a moss 549 VII. Conclusions and future perspectives 549Acknowledgements 549References 549Summary Branching is one of the most striking aspects of land plant architecture, affecting resource acquisition and yield. Polar auxin transport by PIN proteins is a primary determinant of flowering plant branching patterns regulating both branch initiation and branch outgrowth. Several lines of experimental evidence suggest that PIN ‐mediated polar auxin transport is a conserved regulator of branching in vascular plant sporophytes. However, the mechanisms of branching and auxin transport and relationships between the two are not well known outside the flowering plants, and the paradigm for PIN ‐regulated branching in flowering plants does not fit bryophyte gametophytes. The evidence reviewed here suggests that divergent auxin transport routes contributed to the diversification of branching forms in distinct land plant lineages.