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Abscisic acid is a phytohormone regulating plant growth, development and stress responses. PYR1/PYL/RCAR proteins are ABA receptors that function by inhibiting PP2Cs to activate SnRK2s, resulting in phosphorylation of ABFs and other effectors of ABA response pathways. Exogenous ABA induces growth quiescence of lateral roots, which is prolonged by knockout of the ABA receptor PYL8. Among the 14 members of PYR1/PYL/RCAR protein family, PYL9 is a close relative of PYL8. Here we show that knockout of both  PYL9  and  PYL8  resulted in a longer ABA-induced quiescence on lateral root growth and a reduced sensitivity to ABA on primary root growth and lateral root formation compared to knockout of  PYL8  alone. Induced overexpression of  PYL9  promoted the lateral root elongation in the presence of ABA. The prolonged quiescent phase of the  pyl8-1pyl9  double mutant was reversed by exogenous IAA. PYL9 may regulate auxin-responsive genes  in vivo  through direct interaction with MYB77 and MYB44. Thus, PYL9 and PYL8 are both responsible for recovery of lateral root from ABA inhibition via MYB transcription factors.

The ABA receptor PYL9 together with PYL8 plays an important role in regulating lateral root growth