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Abstract Detail

Recent Topics Posters

Lavelle , Amanda Schrager [1].

Leveraging genetics and genomics for an in-depth understanding of lodicule development in grass flowers.

Grass flowers have leaf-like organs called the palea and lemma in the outer whorl, specialized petal homologs called lodicules in the second whorl, stamens in the third whorl, and carpels in the inner whorl. Consistent with the ABC(D)E model of floral development, B-class MADS box transcription factors are required to specify both the lodicules and the stamens. The B-class subfamily consists of two gene lineages, APETALA3-like (AP3L ) and PISTILLATA-like (PI L). In many species, including Arabidopsis thaliana and maize, AP3L and PIL proteins bind DNA as obligate AP3L -PIL heterodimers (obligate heterodimers), however many species, including rice and Brachypodium distachyon, PI L proteins are able to interact with DNA as either PIL-PIL homodimers or as PIL-AP3L heterodimers (facultative homodimers). Additionally, in grasses the PIL subfamily has undergone gene duplication and all grass species sampled have at least two PIL  homologs. Although it is clear that B-class genes specify both lodicule and stamen identity, there is a critical gap in our knowledge relating to how each organ is patterned and how each organ is patterned independently of the other, especially in species with labile dimerization and an expanded gene family. Model grass B. distachyon is being used to gain insight into the functional roles of B-class genes and to further the understanding of lodicule identity genes downstream of the B-class gene family.

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1 - Colorado Mesa University, Biology Department, 1100 North Ave, Grand Junction, CO, 81501, United States

flower development
Brachypodium distachyon

Presentation Type:
Session: P, Recent Topics Posters
Location: Arizona Ballroom/Starr Pass
Date: Monday, July 29th, 2019
Time: 5:30 PM
Number: PRT034
Abstract ID:1414
Candidate for Awards:None

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