The expression of Orysa;CycB1;1 is essential for endosperm formation and causes embryo enlargement in rice.

Planta
Jing GuoXian Sheng Zhang

Abstract

The cell cycle is an important process during seed development in plants and its progression is driven by a number of core regulators such as the cyclins. Currently, however, little is known regarding the role of the cyclins in embryo and endosperm development in cereals. In our current study, we show that the knockdown of Orysa;CycB1;1 in rice results in the production of abnormal seeds, which at maturity contain only an enlarged embryo. It was further found that a delayed and abnormal cellularization occurred in the endosperm in these knockdown seeds which eventually became abortive. Moreover, the observed development of the enlarged embryo was also morphologically abnormal and found to be caused by an enlarged cell size rather than an increased cell number. Expression analysis showed that Orysa;CycB1;1 transcripts were localized in the endosperm and embryo. Genome-wide transcriptional profiling further indicated that a large number of genes are responsible for the phenotype of the enlarged embryo. The results of the knockdown of Orysa;CycB1;1 via an endosperm or an embryo-specific promoter also suggest that the enlarged embryo may be correlated to the abortive endosperm. Our results suggest that Orysa;CycB1;1 expression is c...Continue Reading

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Citations

Nov 11, 2010·Plant & Cell Physiology·Masahiro FujitaNori Kurata
Oct 21, 2014·The Plant Journal : for Cell and Molecular Biology·Tomomi HaraTsukaho Hattori
Apr 16, 2013·Current Opinion in Plant Biology·Shi-Rong ZhouHong-Wei Xue
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May 27, 2021·Plant, Cell & Environment·Jaspreet SandhuHarkamal Walia
Jun 1, 2021·Plant Biotechnology Journal·Jinmi YoonGynheung An

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