SMAX1-dependent seed germination bypasses GA signalling in Arabidopsis and Striga

We show that expression of SL receptors from the parasitic plant Striga hermonthica in the presence of SLs circumvents the GA requirement for germination of Arabidopsis thaliana seed

Michael Bunsick; Shigeo Toh; Cynthia Wong; Zhenhua Xu; George Ly; Christopher S. P. McErlean; Gianni Pescetto; Kawther Elfituri Nemrish; Priscilla Sung; Jack Daiyang Li; Julie D. Scholes; Shelley Lumba

2020

Scholarcy highlights

  • Parasitic plant infestations dramatically reduce the yield of many major food crops of sub-Saharan Africa and pose a serious threat to food security on that continent1
  • We show that expression of SL receptors from the parasitic plant Striga hermonthica in the presence of SLs circumvents the GA requirement for germination of Arabidopsis thaliana seed
  • Striga receptors co-opt and enhance signalling through the HYPOSENSITIVE TO LIGHT/KARRIKIN INSENSITIVE 2 pathway, which normally plays a rudimentary role in Arabidopsis seed germination
  • Our data suggest that ligand-dependent inactivation of SUPPRESSOR OF MAX2 1 in Striga and Arabidopsis can bypass GA-dependent germination in these species
  • S.T. contributed to the general conception of the project, and performed RT–qPCR in Arabidopsis and physiological experiments on Striga
  • G.P., K.E.N., P.S. and J.D.L. contributed to the generation of Arabidopsis transgenic lines and performed germination assays
  • S.L. directed and supervised all of the research

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