摘要
Lateral roots are important to plants for the uptake of nutrients and water. Several members of the Aux/IAA family have been shown to play crucial roles in lateral root development. Here, a member of the rice Aux/IAA family genes, OslAA 11 （LOC_Os03g43400）, was isolated from a rice mutant defective in lateral root development. The gain-of-function mutation in OslAAll strictly blocks the initiation of lateral root primordia, but it does not affect crown root development. The expression of OslAAll is defined in root tips, lateral root caps, steles, and lateral root primordia. The auxin reporter DR5-GUS （^-glucuronidase） was expressed at lower levels in the mutant than in wild-type, indicating that OslAAll is involved in auxin signaling in root caps. The transcript abundance of both OsPINlb and OsPIN10a was diminished in root tips of the Osiaa 11 mutant. Taken together, the results indicate that the gain-of-function mutation in OslAA 11 caused the inhibition of lateral root development in rice.
Lateral roots are important to plants for the uptake of nutrients and water. Several members of the Aux/IAA family have been shown to play crucial roles in lateral root development. Here, a member of the rice Aux/IAA family genes, OslAA 11 （LOC_Os03g43400）, was isolated from a rice mutant defective in lateral root development. The gain-of-function mutation in OslAAll strictly blocks the initiation of lateral root primordia, but it does not affect crown root development. The expression of OslAAll is defined in root tips, lateral root caps, steles, and lateral root primordia. The auxin reporter DR5-GUS （^-glucuronidase） was expressed at lower levels in the mutant than in wild-type, indicating that OslAAll is involved in auxin signaling in root caps. The transcript abundance of both OsPINlb and OsPIN10a was diminished in root tips of the Osiaa 11 mutant. Taken together, the results indicate that the gain-of-function mutation in OslAA 11 caused the inhibition of lateral root development in rice.
