We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
UNDERSTANDING SPIKELET ORIENTATION IN PANICEAE (POACEAE)<sup>1 </sup>.
- Authors
Zanotti, Christian A.; Pozner, Raul; Morrone, Osvaldo
- Abstract
Spikelet structure and grouping are key characters to identiofy grasses. Here we tested the possibility that spikelet pairs, a distinctive morphological structure of many Andropogoneae and Paniceae, are the starting point for a secondary single spikelet condition that can also explain the change of spikelet orientation among Paniceae genera. As a first approach, we studied the inflorescence development of Paspalum simplex. P. stellatum, and Axonopus sufultus are homologous to the subsessile spikelets of P. simplex and that solitary spikelets of P. stellatum are homologous to the pedicellate spikelet of P. simplex. This last homology supports that spikelet orientation results from a differential reduction⁄abortion of either the pedicellate or the subsessile spikelet priumordia. We also discuss the pissobility that the RAMOSA and polar auxin pathways could play a role in the abortion of the lateral subsessile spikelets in P. stellatum. However, the apical meristem inhibition observed in A. Suffultus and P. stellatum seems to depend on a very different genetic control, suggedting that the single spikelet condition is homoplastic within Paniceae and derived from at least two different genetic mechanisms.
- Subjects
GRASS varieties; INFLORESCENCE morphology; AXONOPUS; HOMOLOGY (Biology); PASPALUM
- Publication
American Journal of Botany, 2010, Vol 97, Issue 5, p717
- ISSN
0002-9122
- Publication type
Article
- DOI
10.3732/ajb.0900031