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Genetic Control of Starch Granule Morphology and Physical Structure in Developing Maize Endosperms¹

Maize (Zea mays L.) starch granules in endosperms of 24 genotypes were studied during kernel development at 12, 18, and 24 days post pollination. Maximum and minimum granule dimensions, granule shapes expressed as the ratio of maximum to minimum granule dimensions, and differences in physical structure as measured by birefringence end-point temperature (BEPT), X-ray diffraction analyses, and infrared absorption spectra were determined. Mutant starch granule formation at 12 days after pollination was not different from normal for granule dimensions, granule shapes, and BEPT. Differences from normal were apparent for 18- and 24-day granules for all factors studied except infrared absorption.

Key Words: Mutants • Birefringence end-point temperature • X-ray diffraction

² Instructor of Agronomy, Associate Professor of Plant Breeding, and Associate Professor of Soil Mineralogy, The Pennsylvania State University. University Park, Pa. 16802, respectively.

Received for publication October 14, 1970.

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