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Open AccessArticle

Effects of OsCDPK1 on the Structure and Physicochemical Properties of Starch in Developing Rice Seeds

1
Department of Agronomy, National Chiayi University, Chiayi 60004, Taiwan
2
Agricultural Biotechnology Research Center, Academia Sinica, Taipei 11529, Taiwan
*
Author to whom correspondence should be addressed.
Int. J. Mol. Sci. 2018, 19(10), 3247; https://doi.org/10.3390/ijms19103247
Received: 2 September 2018 / Revised: 7 October 2018 / Accepted: 16 October 2018 / Published: 19 October 2018
(This article belongs to the Special Issue Plant Genetics and Molecular Breeding)
Overexpression of a constitutively active truncated form of OsCDPK1 (OEtr) in rice produced smaller seeds, but a double-stranded RNA gene-silenced form of OsCDPK1 (Ri) yielded larger seeds, suggesting that OsCDPK1 plays a functional role in rice seed development. In the study presented here, we propose a model in which OsCDPK1 plays key roles in negatively controlling the grain size, amylose content, and endosperm appearance, and also affects the physicochemical properties of the starch. The dehulled transgenic OEtr grains were smaller than the dehulled wild-type grains, and the OEtr endosperm was opaque and had a low amylose content and numerous small loosely packed polyhedral starch granules. However, the OEtr grain sizes and endosperm appearances were not affected by temperature, which ranged from low (22 °C) to high (31 °C) during the grain-filling phase. In contrast, the transgenic Ri grains were larger, had higher amylose content, and had more transparent endosperms filled with tightly packed polyhedral starch granules. This demonstrates that OsCDPK1 plays a novel functional role in starch biosynthesis during seed development and affects the transparent appearance of the endosperm. These results improve our understanding of the molecular mechanisms through which the grain-filling process occurs in rice. View Full-Text
Keywords: rice; OsCDPK1; seed development, starch biosynthesis; endosperm appearance rice; OsCDPK1; seed development, starch biosynthesis; endosperm appearance
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MDPI and ACS Style

Jiang, J.-Z.; Kuo, C.-H.; Chen, B.-H.; Chen, M.-K.; Lin, C.-S.; Ho, S.-L. Effects of OsCDPK1 on the Structure and Physicochemical Properties of Starch in Developing Rice Seeds. Int. J. Mol. Sci. 2018, 19, 3247.

AMA Style

Jiang J-Z, Kuo C-H, Chen B-H, Chen M-K, Lin C-S, Ho S-L. Effects of OsCDPK1 on the Structure and Physicochemical Properties of Starch in Developing Rice Seeds. International Journal of Molecular Sciences. 2018; 19(10):3247.

Chicago/Turabian Style

Jiang, Jian-Zhi; Kuo, Chun-Hsiang; Chen, Bo-Hong; Chen, Mao-Kei; Lin, Choun-Sea; Ho, Shin-Lon. 2018. "Effects of OsCDPK1 on the Structure and Physicochemical Properties of Starch in Developing Rice Seeds" Int. J. Mol. Sci. 19, no. 10: 3247.

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