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Review
. 2009 Jan;149(1):46-55.
doi: 10.1104/pp.108.129056.

Hormonal regulation of branching in grasses

Paula McSteen  1
Affiliations
Review

Hormonal regulation of branching in grasses

Paula McSteen. Plant Physiol. 2009 Jan.
No abstract available

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Figures

Figure 1.
Figure 1.
Divergent mechanisms of tillering in the grasses. A, Maize with a single axis of growth. One or two axillary shoots containing the female inflorescence (the ear) grow out. Tillers are generally suppressed. B, Several young rice plants showing that tillers grow out early in vegetative development. C, Ornamental Miscanthus. Tillers grow out from rhizomes beneath the soil surface. A triploid variety, Miscanthus × giganteus, is being investigated as a potential biofuel crop. [See online article for color version of this figure.]
Figure 2.
Figure 2.
Auxin plays a role in axillary meristem initiation in the inflorescence. A, Arabidopsis inflorescence with secondary branches (br) and flowers (fl). B, pid mutant in Arabidopsis showing the pin-shaped inflorescence due to lack of flower production. C, Normal maize tassel with long branches (br) at the base of the main spike. Short branches called spikelet pairs (sp) cover the branches and the central spike. D, bif2 mutant of maize with very few branches and spikelets. [See online article for color version of this figure.]
Figure 3.
Figure 3.
Model for endogenous and exogenous factors controlling bud outgrowth. The blue ball represents an axillary bud in the axil of a leaf. Both endogenous and exogenous factors determine whether or not the axillary bud grows out. Endogenous hormones regulate branching. Auxin (IAA) traveling basipetally inhibits bud outgrowth, cytokinin (CK) moving acropetally promotes outgrowth, while acropetal movement of strigolactone inhibits bud outgrowth. Exogenous factors such as shading and density inhibit bud outgrowth, while fertilizer and nutrients promote bud outgrowth.
See this image and copyright information in PMC

References

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