| Structural and Histochemical Characterization of Developing Rice Caryopsis |
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| 作者姓名： | YU Xu-run ZHOU Liang XIONG Fei WANG Zhong |
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| 摘 要： | The development of pericarp, seed coat, starchy endosperm and aleurone of the rice caryopsis was investigated, histochemically and structurally, from the time of flowering to maturity. The results showed that during its growth, the maximum length of the caryopsis was attained first, followed by width and then thickness. Histochemical examination of the caryopsis showed that starch was mainly accumulated in the endosperm, but the endosperm showed no metabolic activity, while embryo and pericarp contained a few starch grains, and embryo and aleurone were strongly active. Aleuronic cells contained many aleurone grains and spherosomes, and aleurone in the dorsal region developed earlier and contained more layers of cells. Amyloplasts in endosperm contained many starch granules and were spherical at early stages but polyhedric at late stages. The protein bodies appeared later than amyloplasts, and the number of protein bodies in subaleurone was greater than those in the starchy endosperm. The white-belly portion of endosperm might be relative to the status of amyloplast development.
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| 关 键 词： | 组织化学 颖果 化学特征 结构 水稻 细胞组成 早期阶段 淀粉粒 |
| 收稿时间： | 21 June 2013 |
Structural and Histochemical Characterization of Developing Rice Caryopsis |
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| YU Xu-run,ZHOU Liang,XIONG Fei,WANG Zhong.Structural and Histochemical Characterization of Developing Rice Caryopsis[J].Rice science,2014,21(3):142-149. |
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| Authors: | YU Xu-run ZHOU Liang XIONG Fei WANG Zhong |
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| Institution: | College of Bioscience and Biotechnology, Yangzhou University, Yangzhou 225009, China |
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| Abstract: | The development of pericarp, seed coat, starchy endosperm and aleurone of the rice caryopsis was investigated, histochemically and structurally, from the time of flowering to maturity. The results showed that during its growth, the maximum length of the caryopsis was attained first, followed by width and then thickness. Histochemical examination of the caryopsis showed that starch was mainly accumulated in the endosperm, but the endosperm showed no metabolic activity, while embryo and pericarp contained a few starch grains, and embryo and aleurone were strongly active. Aleuronic cells contained many aleurone grains and spherosomes, and aleurone in the dorsal region developed earlier and contained more layers of cells. Amyloplasts in endosperm contained many starch granules and were spherical at early stages but polyhedric at late stages. The protein bodies appeared later than amyloplasts, and the number of protein bodies in subaleurone was greater than those in the starchy endosperm. The white-belly portion of endosperm might be relative to the status of amyloplast development. |
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| Keywords: | rice caryopsis structure development chalkiness |
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