Browsing by Author "Sett, Susmita"

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Geminivirus-induced reprogramming of plant defense mechanisms: molecular insights and research frontiers
(Annual Reviews, 2026) Sharma, Namisha; Sett, Susmita; Prasad, Manoj
Geminiviruses employ multifunctional protein ammunition to evade robust plant defense pathways. Key viral proteins effectively manipulate host signaling mechanisms to create a permissive environment for viral replication. Rapid evolutionary adaptation of geminiviruses, synergized by the proliferation of insect vectors, creates a challenge for effective disease control. Current plant resistance against geminiviruses primarily relies on antiviral RNA silencing and the localized cell death mechanism as an outcome of the hypersensitive response. To win the escalating arms race between geminivirus manipulation and subsequent plant counteracting strategies and effectively restrict viral invasion, these defense strategies need to be updated or supplemented with novel engineering approaches. In this review, we provide a critical contemporary understanding of viral reprogramming pathways and host counter-defense responses that provide new avenues to improve plant immunity against geminiviruses.
Plant-virus-abiotic stress interactions: A complex interplay
(Elsevier B.V., 2022) Prasad, Ashish; Sett, Susmita; Prasad, Manoj
Under field conditions, plants are subjected to a wide array of biotic and abiotic stresses. These are detrimental to the survival of plants and adversely affects global crop productivity. Changing climate has led to elevated temperatures and unpredicted whether patterns across the world leading to suboptimal crop performance. This is coupled by the emergence of novel pathogen strains which are resistant to anti-pathogenic agents. The situation is even worse in case of viruses where antiviral agents for controlling viral diseases in plants is lacking. The explosion of international trade has helped in the sharing of surplus resources from one location to the other and benefitted the economy of most countries however, this has also resulted in the spread of viruses and other pathogens. Recent years have seen a paradigm shift in the research methodology with combined stress gaining major attention instead of solitary stress. Viruses influence a plant’s response to various abiotic stresses, similarly, abiotic stress imposition has a great effect on viral disease progression. The recent developments associated with plant-virus-abiotic stress interactions along with the way forward to tackle such stresses has been discussed in the present review.
Recent perspective of non-coding RNAs at the nexus of plant-pathogen interaction
(Elsevier B.V., 2023) Sharma, Shambhavi; Sett, Susmita; Das, Tuhin; Prasad, Ashish; Prasad, Manoj
In natural habitats, plants are exploited by pathogens in biotrophic or necrotrophic ways. Concurrently, plants have evolved their defense systems for rapid perception of pathogenic effectors and begin concerted cellular reprogramming pathways to confine the pathogens at the entry sites. During the reorganization of cellular signaling mechanisms following pathogen attack, non-coding RNAs serves an indispensable role either as a source of resistance or susceptibility. Besides the well-studied functions of non-coding RNAs related to plant development and abiotic stress responses, previous and recent discoveries have established that non-coding RNAs like miRNAs, siRNAs, lncRNAs and phasi-RNAs can fine tune plant defense responses by targeting various signaling pathways. In this review, recapitulation of previous reports associated with non-coding RNAs as a defense responder against virus, bacteria and fungus attacks and insightful discussion will lead us to conceive innovative ideas to fight against approaching threats of resistant breaking pathogens.
Resistance genes on the verge of plant-virus interaction
(Elsevier B.V., 2022) Sett, Susmita; Prasad, Ashish; Prasad, Manoj
Viruses are acellular pathogens that cause severe infections in plants, resulting in worldwide crop losses every year. The lack of chemical agents to control viral diseases exacerbates the situation. Thus, to devise proper management strategies, it is important that the defense mechanisms of plants against viruses are understood. Resistance (R) genes regulate plant defense against invading pathogens by eliciting a hypersensitive response (HR). Compatible interaction between plant R gene and viral avirulence (Avr) protein activates the necrotic cell death response at the site of infection, resulting in the cessation of disease. Here, we review different aspects of R gene-mediated dominant resistance against plant viruses in dicotyledonous plants and possible ways for developing crops with better disease resistance.