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Rice Undeveloped Tapetum1 Is a Major Regulator of Early Tapetum Development W
 

Summary: Rice Undeveloped Tapetum1 Is a Major Regulator of
Early Tapetum Development W
Ki-Hong Jung,a Min-Jung Han,a Yang-Seok Lee,a Yong-Woo Kim,b Inhwan Hwang,b Min-Jeong Kim,c
Yeon-Ki Kim,c Baek Hie Nahm,c and Gynheung Ana,d,1
a National Research Laboratory of Plant Functional Genomics, Division of Molecular and Life Sciences,
Pohang University of Science and Technology, Pohang 790-784, Republic of Korea
b Center for Plant Intracellular Trafficking and Division of Molecular and Life Sciences, Pohang University
of Science and Technology, Pohang 790-784, Republic of Korea
c GreenGene Biotech, Myongji University 38-2, Namdong Yongin, Kyonggido 449-728, Republic of Korea
d Functional Genomic Center, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea
The tapetum, the innermost of four sporophytic layers in the anther wall, comes in direct contact with the developing male
gametophyte and is thought to play a crucial role in the development and maturation of microspores. Here, we report the
identification of rice (Oryza sativa) Undeveloped Tapetum1 (Udt1), which is required for the differentiation of secondary
parietal cells to mature tapetal cells. T-DNA or retrotransposon Tos17 insertions in the Udt1 gene caused male sterility. The
anther walls and meiocytes of the mutants were normal during the early premeiosis stage, but their tapeta failed to differentiate
and became vacuolated during the meiotic stage. In addition, meiocytes did not develop to microspores, and middle layer
degeneration was inhibited. Consequently, the anther locules contained no pollen. The UDT1:green fluorescent protein fusion
protein was localized to the nucleus. This, together with its homology with other basic helix-loop-helix proteins, suggests that
UDT1 is a transcription factor. DNA microarray analysis identified 958 downregulated and 267 upregulated genes in the udt1-1
anthers, suggesting that Udt1 plays a major role in maintaining tapetum development, starting in early meiosis.

  

Source: An, Gynheung - Department of Life Science, Pohang University of Science and Technology

 

Collections: Biotechnology; Biology and Medicine