Abstract Detail

Botany 2021 and ASPB Special Symposium

Chiu, Chai Hao [1], Roszak, Pawel [2], Orvosova, Martina [1], Paszkowski, Uta [1].

A set of conserved receptors is essential for root system architectural changes induced by arbuscular mycorrhizal fungi.

Root systems regulate their branching patterns in response to environmental stimuli. Arbuscular mycorrhizal (AM) fungi increase lateral root development (LRD) prior to contact and nutrient exchange. While LRD has been used as an output for symbiosis signalling, we find that application of a wide range of chitin-derived signals, including shrimp shell chitin increases root branching in rice, indicating a nonspecific response to chitin that results in the initiation of new LR primordia. We demonstrate that rice Lysin-motif (LysM) receptors  CERK1, CEBiP  and  NFR5, known for their roles in MAMP perception, are all required for the developmental root response. Homologous LysM receptors from both AM hosts (Medicago truncatula  and  Lotus japonicus) and non-host  Arabidopsis thaliana  are similarly necessary for chitin-induced LRD, lending further support for a symbiosis-independent, broadly-conserved signal transduction mechanism. Using rice mutants impaired in SL biosynthesis and signalling, we show that SL is required to coordinate this developmental response. Our work reveals that LysM receptors link chitin perception to hormone and developmental regulation in plants

1 - Cambridge University, Crop Science Centre, Lawrence Weaver Road, Cambridge, CB2 0LE, United Kingdom
2 - Sainsbury Laboratory University of Cambridge, Bateman Street, Cambridge, CB2 1LR, United Kingdom

Keywords:
Arbuscular mycorrhizae
root architecture
chitin
Lysin-motif receptor kinases.

Presentation Type: Special Sessions
Session: SY4, Botany 2021 and ASPB Special Symposium
Location: Virtual/Virtual
Date: Wednesday, July 21st, 2021
Time: 11:30 AM(EDT)
Number: SY4002
Abstract ID:1274
Candidate for Awards:None