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SUMMARY:The maize leaf – from development to environmental response - Sa
 rah Hake\, Director USDA Gene Expression Center
DTSTART:20160421T120000Z
DTEND:20160421T130000Z
UID:TALK65481@talks.cam.ac.uk
CONTACT:38889
DESCRIPTION:Marisa Rosa\, Jazmin Abraham Juarez\, Michael Lewis\, Brian St
 . Aubin\, Alyssa Anderson\, Katsutoshi Tsuda\, Sarah Hake\n\nGrass leaves 
 provide a useful framework to investigate mechanisms that coordinate indiv
 idual cell behavior with growth and differentiation.  Their stereotypical 
 shape includes a sheath that grips the stem\, a blade that leans away from
  the stem\, and a ligule region at the junction of blade and sheath. Prior
  to any visible differentiation of blade and sheath\, a preligule band of 
 dividing cells marks the position of the future ligule. Because the ligule
  occurs perpendicular to the cell files born from divisions\, positional s
 ignals must guide the initiation and elaboration of the ligule. Using muta
 nt analysis and laser capture microdissection\, we have discovered that ge
 nes expressed at the ligule are also expressed in the boundary between lat
 eral organs and the meristem. This result suggests a similarity between or
 gan and ligule initiation. We are also investigating pleiotropic mutants w
 ith diminished or missing ligules. One is narrow odd dwarf\, encoding a pl
 asma membrane localized protein that may function in orchestrating cell wa
 ll behavior with external signals. Genes that are differentially expressed
  in nod mutants overlap with differentially expressed genes at the pre-lig
 ule and with genes differentially expressed under drought stress. A second
  gene is liguleless narrow (lgn)\, which encodes a kinase. The mutant vers
 ion of LGN shows a strong genotype by environment interaction. We have ide
 ntified Sympathy for the Ligule (Sol)\, a QTL that rescues Lgn-R in hot we
 ather. These pleiotropic mutants provide an inroad into exploring the conn
 ection between leaf development and stress response. \n
LOCATION:Department of Plant Sciences\, Large Lecture Theatre
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