Abstract
In addition to commonly known ways of starch granule proliferation, starch granules in sorghum are also formed from the starch granule occurrence center (SGOC) in the central starchy endosperm. In this paper, the SGOC in sorghum central starchy endosperm was observed with light and electron microscopy. Results showed that the plastid origin site produced many tube-like and spherical plastids, which accumulated starch to form tiny starch granules in the SGOC. Subsequently these the tiny starch granules were enlarged and radially distributed from the SGOC. In sorghum, the SGOC formed only in central starchy endosperm, but not in sub-aleurone cells. The SGOC formed and developed at grain-filling stages, but disappeared at later stages of sorghum endosperm development. Thus, the starch granule proliferation from SGOC is an effective way of producing dense plastids; and development and distribution of the SGOC exhibited spatio-temporal characteristics.
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Acknowledgments
This work is supported by Grants from National Natural Science Foundation of China (Nos. 31400714, 31270228) and Key projects of Anhui Provincial Department of Education (No. KJ2015A168).
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Zheng, Y., Wang, Z. & Zeng, D. Developmental characteristics of starch granule occurrence center in sorghum central starchy endosperm. Ind J Plant Physiol. 22, 34–39 (2017). https://doi.org/10.1007/s40502-016-0246-z
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DOI: https://doi.org/10.1007/s40502-016-0246-z