Evolutionary Developmental Biology (Evo-Devo)
Fisher, Amanda , Malcomber, Simon , Columbus, J. travis .
Expression pattern of the SEPALLATA gene LHS1 in Uniola clade (Poaceae: Chloridoideae) inflorescences.
As part of an ongoing study of chloridoid grass evolution, inflorescence diversity in the Uniola clade (= the Uniolinae subtribe Uniolinae, tribe Eragrostideae) was examined. The subtribe is composed of the New World genus Uniola, several Old World genera (including Fingerhuthia), and one Australian genus (ined.). Infloresecences are racemose (primary branches only) in all but one subclade, often with a spike-like appearance. Spikelets are unusual among grasses in possessing sterile proximal and distal florets separated by fertile florets. The exception is Fingerhuthia, which lacks proximal sterile florets. The MADS-box SEPALLATA gene LEAFY HULL STERILE1 (LHS1) is expressed in a variety of floral structures across the grass family, but is consistently expressed in spikelet meristems, lemmas, paleas, and the upper floret in spikelets with basipetal maturation. We compare the expression pattern of LHS1 in the Uniola clade with LHS1 expression patterns found in other grass species to test hypotheses of expression in the terminal floret, lack of expression in the gynoecium, and expression corresponding to an effect on lemma morphology.
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1 - Rancho Santa Ana Botanic Garden, 1500 N. College Ave., Claremont, CA, 91711, USA
2 - CSU - Long Beach, 1250 Bellflower Blvd, Long Beach, CA, 90840, USA
3 - Rancho Santa Ana Botanic Garden, 1500 North College Avenue, Claremont, CA, 91711-3157, USA
Presentation Type: Oral Paper:Papers for Topics
Location: Delaware C/Hyatt
Date: Tuesday, July 10th, 2012
Time: 10:15 AM