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Abstract Detail

Evolutionary Developmental Biology (Evo-Devo)

Hodge, John [1], Kellogg, Elizabeth [2].

Abscission zone development and the loss of shattering in foxtail millet (Setaria italica).

Seed shattering in Poaceae, or the release of diaspores along an abscission zone, is a crucial agronomic trait that has been selected repeatedly during the domestication of various cereal crops. The position of the abscission zone within the grass spikelet or inflorescence branch varies among species, and may have systematic significance. Despite the importance of this trait, however, abscission zone development has been investigated only in a few agronomically significant lineages, particularly rice (Oryza sativa). Accordingly, abscission zone formation was studied in the panicoid genus Setaria using the wild free-shattering green millet (S. viridis) and the reduced-shattering domesticate foxtail millet (S. italica). In both species of Setaria, the abscission zone forms immediately below the spikelet as it does in other panicoids. Tensile strength and histology of the spikelet-pedicel junction were characterized over developmental time, and expression of candidate genes known from other species of Poaceae was assessed. Development of the abscission zone in S. viridis differs fundamentally from that described in rice, and loss of abscission in S. italica does not occur in the same way as loss in O. sativa. In addition, orthologues of the abscission genes qSH1 in Oryza and Sh1 in Sorghum are both expressed in Setaria during abscission zone patterning, suggesting that these genes could be part of a conserved developmental pathway.

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1 - Donald Danforth Plant Science Center, 975 Warson Rd., Kellogg Lab, St. Louis, MO, 63132, United States
2 - Donald Danforth Plant Science Center, Department Of Biology, 975 North Warson Road, St. Louis, MO, 63132, USA

Setaria viridis
Setaria italica
green millet
foxtail millet.

Presentation Type: Oral Paper:Papers for Topics
Session: 42
Location: Hall B/The Shaw Conference Centre
Date: Tuesday, July 28th, 2015
Time: 11:00 AM
Number: 42004
Abstract ID:684
Candidate for Awards:Katherine Esau Award

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