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Abscisic Acid–Responsive 18 (CaABR18) Protein from Chickpea Inhibits the Growth of the Wilt-Causing Fusarium oxysporum f. sp. ciceri Race1

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Abstract

Multigene family pathogenesis-related-10 (PR-10) proteins are indispensable for initiation of plant defense reactions upon pathogen attack. Here, we report the isolation and differential induction of Cicer arietinum L. ABR18 (CaABR18) gene in susceptible and resistant chickpea upon exposure to Fusarium oxysporum f. sp. ciceri Race1 (Foc1). Further, sequence analysis and structural studies confirmed that CaABR18 protein possesses conserved glycine-rich P-loop motif and Betv 1 domain, which are common to many PR-10 family proteins. CaABR18 gene was found to be expressed in all the developing organs, with higher abundance in the mature leaves. Foc1 inoculation resulted in higher expression of CaABR18 gene in the resistant chickpea compared with susceptible one. CaABR18 protein induction was also observed by salicylic acid (SA) or abscisic acid (ABA) treatment. Biochemical analysis was performed using in vitro purified histidine-tagged recombinant ABR18 protein. Purified recombinant protein exhibits in vitro RNase and DNase activities. Application of recombinant ABR18 protein increases PI/SYTOX green uptake and nuclear disintegration and suppresses the growth of Foc1 hyphae in vitro. Agrobacterium-mediated transient expression of ABR18-YFP triggers reactive oxygen species (ROS) formation and cell death in Nicotiana benthamiana leaves. The fusion protein is shown to be targeted to the host nucleus. Taken together, our results revealed that CaABR18 imparts Fusarium resistance in chickpea by RNA/DNA degradation within host cells leading to programmed cell death (PCD) and also shows antifungal activity through its proper internalization, increasing membrane permeability and nuclear disintegration of Foc1.

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Acknowledgments

Authors are indebted to the Director, Bose Institute, for providing infrastructural facilities. SD acknowledges Indian National Science Academy for providing Senior Scientist Fellowship. MC and JC are thankful to Bose Institute for financial assistance. Authors are thankful to Dr. Suresh C Pande (ICRISAT, Patancheru), Dr. Kiran Kumar Sharma, and Dr. Pooja Bhatnagar (ICRISAT, Patancheru) for providing fungal culture and chickpea seeds. Special thanks are offered to Prof. Shubho Chaudhuri for providing pEarlyGate 101 vector. Sincere thanks are extended to Mr. Swarnava Das for his help during laboratory experiments. Authors also thank Mr. Surojit Maity and Mr. Sudipta Basu for technical support.

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MC and SD conceived the research idea and designed the experiments. MC and JC performed the experiments. MC, JC, and SD analyzed data and wrote the manuscript. All authors have read and approved the manuscript.

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Correspondence to Sampa Das.

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Key message

Chickpea ABR18 protein demonstrates RNase/DNase functions, cell death, and antifungal activity that suppresses the growth of the Fusarium oxysporum f. sp. ciceri Race1 hyphae.

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Chatterjee, M., Chakraborty, J. & Das, S. Abscisic Acid–Responsive 18 (CaABR18) Protein from Chickpea Inhibits the Growth of the Wilt-Causing Fusarium oxysporum f. sp. ciceri Race1. Plant Mol Biol Rep 37, 170–185 (2019). https://doi.org/10.1007/s11105-019-01146-5

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  • DOI: https://doi.org/10.1007/s11105-019-01146-5

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