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Vol. 12, No. 8, pp. 1145-1154, April 15, 1998
1 Department of Plant and Microbial Biology, University
of California, Berkeley, California 94720, USA;
2 Pioneer
Hi-Bred International, Johnston, Iowa 50131, USA;
3 Plant Gene
Expression Center, US Department of Agriculture-Agricultural Research
Service (USDA-ARS), Albany, California 94710, USA
The orderly production of meristems with specific fates is crucial
for the proper elaboration of plant architecture. The maize inflorescence meristem branches several times to produce lateral meristems with determinate fates. The first meristem formed, the spikelet pair meristem, produces two spikelet meristems, each of which
produces two floral meristems. We have identified a gene called
indeterminate spikelet1 (ids1) that specifies a
determinate spikelet meristem fate and thereby limits the number of
floral meristems produced. In the absence of ids1 gene
function, the spikelet meristem becomes indeterminate and produces
additional florets. Members of the grass family vary in the number of
florets within their spikelets, suggesting that ids1 may play a
role in inflorescence architecture in other grass species. ids1
is a member of the APETALA2 (AP2) gene family of
transcription factors that has been implicated in a wide range of plant
development roles. Expression of ids1 was detected in many
types of lateral organ primordia as well as spikelet meristems. Our
analysis of the ids1 mutant phenotype and expression pattern
indicates that ids1 specifies determinate fates by suppressing
indeterminate growth within the spikelet meristem.
[Key Words: Meristem; spikelet; indeterminate spikelet1; APETALA2; determinacy]
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