The Overexpression of <i>ORR3</i> Negatively Regulates the Growth of Young Rice Roots by Reducing the Cell Size and the Number in the Root Meristematic Zone.

Additionally, the transcription levels of the AUX family genes and the PIN family genes related to auxin polar transport, such as OsAUX1 , OsAUX3 , OsAUX5 , OsPIN1a , and OsPIN1c , were upregulated in the root tips of OE-15 and OE-22 , while the transcription levels of OsAUX2 , OsPIN1b , and OsPIN2 were downregulated, all reaching significant or highly significant levels ( Figure 4 E–L).

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