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Fig. 1. The narrow sheath mutant phenotype is a deletion of a lateral compartment
that includes the leaf margins. (A) Model depicting the recruitment of maize
founder cells in two distinct compartments, corresponding to the central
domain (green) and the ns lateral domain (yellow). (B) Cartoon of a
transverse section through the maize founder cells. The model predicts that NS
functions to recruit the lateral founder-cell domains from two distinct foci
(red arrows), one corresponding to each side of the leaf. Cartoons model the
ns mutant (D) and the non-mutant leaf primordium (C). Non-mutant leaves
comprise at least two mediolateral compartments, the central domain (green)
and the ns lateral domain (yellow). The ns mutant leaf exhibits a
deletion of the lateral domain, which includes the margins of the leaf blade,
the leaf sheath and internode. Note that the central compartment includes the
midrib and the leaf tip, domains that are intact in ns mutant leaves. The ns
mutant phenotype is a duplicate factor trait, dependent upon mutations in both
ns1 and ns2. (E) Mature maize leaves from plants homozygous
for non-mutant alleles of Ns1 and Ns2. (F) ns mutant leaves
homozygous for mutations in both ns1 and ns2. Non-mutant
leaves from plants of the complimentary genotypes Ns1, ns2 (G), and
ns1, Ns2 (H). SAM, shoot apical meristem.
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