ABA Receptor PYL8 Identified as Promoter in Lateral Root Growth
Aug 27, 2014 Email"> PrintText Size
Researchers from Shanghai Center for Plant Stress Biology and Purdue University have revealed that by enhancing the activities of MYB77 and its paralogs, MYB44 and MYB73, the ABA receptor PYL8 can promote the lateral root growth of the core ABA-SnRK2 signaling pathway independently.
The phytohormone abscisic acid (ABA) regulates plant growth, development, and abiotic stress responses. ABA signaling is mediated by a group of receptors which known as the PYR1/PYL/RCAR family. The pyrabactin resistance 1-like protein PYL8 is just a member of this family. Under stress conditions, ABA signaling activates SnRK2 protein kinases to inhibit lateral root growth following emergence from the primary root. However, even in the case of persistent stress, lateral root growth recovers from inhibition at last.
A group of researchers led by Professor ZHU Jiankang found that followed the inhibition by ABA, PYL8 is required for the recovery of post-emergence lateral root growth. PYL8 not only interacts directly with the transcription factors MYB77, MYB44, and MYB73, but also increases the binding of MYB77 to its target MBSI motif in the promoters of multiple auxin responsive genes. Thus, PYL8 amplifies auxin response in lateral root under stressed condition, and promotes lateral root growth eventually.
The PYL family has 14 members in Arabidopsis, 13 of which have been demonstrated to function as ABA receptors except PYL13. The direct and specific interactions between PYL8 and MYB77 indicate that these PYLs might effect differentially in response to various abiotic stresses with specialized partners. These progresses may be helpful in increasing the drought resistance of crops.
The finding entitled "The ABA Receptor PYL8 Promotes Lateral Root Growth by Enhancing MYB77-Dependent Transcription of Auxin-Responsive Genes" was selected as Cover Article for Science Signaling and published on the recent issue (Sci Signal, 2014, 328, ra53).
The ABA receptor PYL8 promotes lateral root growth by enhancing MYB77-dependent transcription of auxin-responsive genes. (Image: Getty Images/ iStockphoto)
Researchers from Shanghai Center for Plant Stress Biology and Purdue University have revealed that by enhancing the activities of MYB77 and its paralogs, MYB44 and MYB73, the ABA receptor PYL8 can promote the lateral root growth of the core ABA-SnRK2 signaling pathway independently.
The phytohormone abscisic acid (ABA) regulates plant growth, development, and abiotic stress responses. ABA signaling is mediated by a group of receptors which known as the PYR1/PYL/RCAR family. The pyrabactin resistance 1-like protein PYL8 is just a member of this family. Under stress conditions, ABA signaling activates SnRK2 protein kinases to inhibit lateral root growth following emergence from the primary root. However, even in the case of persistent stress, lateral root growth recovers from inhibition at last.
A group of researchers led by Professor ZHU Jiankang found that followed the inhibition by ABA, PYL8 is required for the recovery of post-emergence lateral root growth. PYL8 not only interacts directly with the transcription factors MYB77, MYB44, and MYB73, but also increases the binding of MYB77 to its target MBSI motif in the promoters of multiple auxin responsive genes. Thus, PYL8 amplifies auxin response in lateral root under stressed condition, and promotes lateral root growth eventually.
The PYL family has 14 members in Arabidopsis, 13 of which have been demonstrated to function as ABA receptors except PYL13. The direct and specific interactions between PYL8 and MYB77 indicate that these PYLs might effect differentially in response to various abiotic stresses with specialized partners. These progresses may be helpful in increasing the drought resistance of crops.
The finding entitled "The ABA Receptor PYL8 Promotes Lateral Root Growth by Enhancing MYB77-Dependent Transcription of Auxin-Responsive Genes" was selected as Cover Article for Science Signaling and published on the recent issue (Sci Signal, 2014, 328, ra53).
The ABA receptor PYL8 promotes lateral root growth by enhancing MYB77-dependent transcription of auxin-responsive genes. (Image: Getty Images/ iStockphoto)
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