Abstract
Cytological and physiological changes were studied in orthodox maize (Zea mays L.) embryos following the acquisition of cryotolerance to liquid nitrogen during seed development. It was found that the embryonic cells at radicle portion were hydrated at all stages investigated, but those at early stages contained fully functional organelles, which disappeared at last developmental stages, and reserve materials accumulated intensively during seed development. Total soluble sugar content in the embryos had a steady rise on fresh weight and moisture weight basis; meanwhile, soluble and heat-stable proteins increased progressively in their number and contents as embryos matured. These cytological and biochemical changes had good correspondence with acquisition of cryotolerance in maize embryos.
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Abbreviations
- DAP:
-
Days after pollination
- W50FS :
-
The upper limit of moisture content allowing 50% postthaw embryos to survive
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Acknowledgments
This study was supported by the National Natural Science Foundation of China (No. 30571526) and the President’s Foundation of the Chinese Academy of Sciences.
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The authors declare that they have no conflict of interest.
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Wen, B., Wang, R. & Song, S. Cytological and physiological changes related to cryotolerance in orthodox maize embryos during seed development. Protoplasma 236, 29–37 (2009). https://doi.org/10.1007/s00709-009-0044-9
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DOI: https://doi.org/10.1007/s00709-009-0044-9