Entries by Sunita Pathak

Nitrate inhibits nodule organogenesis through inhibition of cytokinin biosynthesis in Lotus japonicus (bioRxiv)

The symbiotic association between legumes and nitrogen-fixing rhizobia leads to the formation of nodules in roots, which supply nitrogen to the plant in low soil nitrate condition. In contrast, the presence of high nitrate reduces nodule formation. Cytokinin (CK) biosynthesis plays a major role in nodule organogenesis, but the impact of high nitrate on CK […]

Condensation of Rubisco into a proto-pyrenoid in higher plant chloroplasts (bioRxiv)

Rubisco is a major enzyme in assimilating CO2 during photosynthesis. The efficiency of CO2 assimilation is compromised by a low ratio of CO2/O2, especially in C3 plants like rice, wheat and soybean. Algae sequester Rubisco as a condensate in a microcompartment called a pyrenoid within the chloroplast and have a CO2-concentrating mechanism that delivers CO2 […]

Transcriptional regulation of PLETHORA1 in the root meristem through an importin and its two antagonistic cargos (Plant Cell)

Plant root growth is sustained by stem cells in the root meristems, and the stem cell fate is maintained by the quiescent center (QC). PLETHORA (PLT) protein gradients contribute to maintaining the root meristem cell fate, although the transcriptional regulatory mechanism that establishes the PLT gradient is still in question. To address this, Xiong et […]

Review: Biomolecular condensates in photosynthesis and metabolism ($) (Curr. Opin. Plant Biol.)

Biomolecular condensates are membraneless organelles with the capacity to spatially concentrate biomolecules. Liquid-liquid phase separation (LLPS) is one mechanism of condensate formation in which demixing of macromolecules leads to separation into dense and light phases. Photosynthetic organisms like cyanobacteria and green algae also form CO2-fixing compartments as biomolecular condensates through LLPS. In this paper, Wunder […]

Review: Plant–microbiome interactions: from community assembly to plant health (Nat. Rev. Microbiol)

The association of plants with communities of beneficial microbes,  called plant microbiota, has a positive effect on growth and proliferation of both organisms. Recent findings in plant microbiota research uncovered the role of individual microbes and associated genes during plant-microbe interaction at a community level, showing similar taxa of microbes and related genes shared between […]

Lipo-chitooligosaccharides as regulatory signals of fungal growth and development (Nature Comms)

During symbiosis, the rhizobia bacteria rely on their lipo-chitooligosachharide signals (LCOs) to associate with plants. This signal is perceived by plant receptor like kinase, LysM-containing receptors which activate the common symbiosis signaling pathway (CSSM). Fungal symbiosis with plants has also adopted a similar symbiotic pathway. But, are the LCOs signals limited to symbiotic fungi only? […]

Local auxin biosynthesis is required for root regeneration after wounding (Nature Plants)

During root development, auxin accumulates at the stem cell niche (SCN) located at the root meristem. Both polar auxin transport and local auxin biosynthesis contribute to the auxin accumulation. During root regeneration after wounding, the source of auxin accumulation is still a question. To address that, Matosevich et al. used an inhibitor of local auxin […]

The key role of terminators on the expression and post-transcriptional gene silencing of transgenes (Plant J.)

Transgene introduction has been a major tool in modern plant science, but the ability of plants to distinguish ‘self’ from ‘non-self’ can lead to transgene silencing. This mechanism is mediated by the recruitment of RDR6 (an RNA-Dependent RNA polymerases) leading to the production of several siRNAs (small interfering RNAs) targeting the transgenes for silencing. The […]

A CEP Peptide receptor-like kinase regulates root growth and symbiotic nodulation (Plant Cell)

Under low N condition, plants form more lateral roots to facilitate N-uptake efficiency, and legumes such as Medicago truncatula develop more nodules to fulfill plant nitrogen requirements. Since both lateral root formation and nodulation are energy-consuming processes, plants balance these developmental processes, but the regulatory mechanism involved is still a question. Zhu et al. found […]