Pod corn is caused by rearrangement at the Tunicate1 locus.

Abstract excerpt

Pod corn (Zea mays var tunicata) was once regarded as ancestral to cultivated maize, and was prized by pre-Columbian cultures for its magical properties. Tunicate1 (Tu1) is a dominant pod corn mutation in which kernels are completely enclosed in leaflike glumes. Here we show that Tu1 encodes a MADS box transcription factor expressed in leaves whose 5' regulatory region is fused by a 1.8-Mb chromosomal inversion...

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