Karrikins delay soybean seed germination by mediating abscisic acid and gibberellin biogenesis under shaded conditions

Scientific Reports
Yongjie MengWenyu Yang

Abstract

Karrikins (KAR) are a class of signal compounds, discovered in wildfire smoke, which affect seed germination. Currently, numerous studies have focused on the model plant Arabidopsis in the KAR research field, rather than on crops. Thus the regulatory mechanisms underlying KAR regulation of crop seed germination are largely unknown. Here, we report that KAR delayed soybean seed germination through enhancing abscisic acid (ABA) biosynthesis, while impairing gibberellin (GA) biogenesis. Interestingly, KAR only retarded soybean seed germination under shaded conditions, rather than under dark and white light conditions, which differs from in Arabidopsis. Phytohormone quantification showed that KAR enhanced ABA biogenesis while impairing GA biosynthesis during the seed imbibition process, and subsequently, the ratio of active GA4 to ABA was significantly reduced. Further qRT-PCR analysis showed that the transcription pattern of genes involved in ABA and GA metabolic pathways are consistent with the hormonal measurements. Finally, fluridone, an ABA biogenesis inhibitor, remarkably rescued the delayed-germination phenotype of KAR-treatment; and paclobutrazol, a GA biosynthesis inhibitor, inhibited soybean seed germination. Taken togeth...Continue Reading

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Citations

Apr 21, 2019·Plants·Mohamed A Elsadek, Eltohamy A A Yousef
Apr 6, 2019·Journal of Experimental Botany·Zsuzsanna MéraiOrtrun Mittelsten Scheid
Sep 4, 2019·Genome Génome / Conseil National De Recherches Canada·Raman Manoharlal, G V S Saiprasad
Jan 1, 2020·Plants·Michal AntalaMarian Brestic
Aug 18, 2018·International Journal of Molecular Sciences·Agnieszka PłażekBogdan Wolko
Oct 24, 2020·International Journal of Molecular Sciences·Amana KhatoonSetsuko Komatsu
Oct 16, 2020·International Journal of Molecular Sciences·Utpal BoseMichelle L Colgrave

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Methods Mentioned

BETA
Nuclear Magnetic Resonance
PCR

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