Browsing by Author "Sanyal, Rajarshi"

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    Leaf growth in third dimension: a perspective of leaf thickness from genetic regulation to ecophysiology
    (John Wiley & Sons, 2025) Aneja, Prakshi; Sanyal, Rajarshi; Ranjan, Aashish
    Leaf thickness, the leaf growth in the third dimension as quantified by the distance between the adaxial and abaxial surface, is an indispensable aspect of leaf development. The fitness of a plant is strongly influenced by leaf thickness via modulation of major physiological processes, including photosynthesis and water use efficiency. The cellular basis of leaf thickness by alterations in either cell size or the number of cell layers is envisaged using Arabidopsis leaf thickness mutants, such as angustifolia (an) and rotundifolia (rot). Environmental factors coordinate with endogenous signaling mechanisms to exhibit leaf thickness plasticity. Plants growing in different ecological and environmental regimes show different leaf thickness attributes. However, genetic and molecular understandings of leaf thickness regulation remain largely limited. In this review, we highlight how cellular growth is transposed to fine-tune the leaf thickness via the integration of potential cues and molecular players. We further discuss the physiological significance of leaf thickness plasticity to the environmental cues that might serve as ecological adaptation enabling the plants to withstand future climatic conditions. Taken together, we seek to bridge the genetics and molecular biology of leaf thickness to its physiological significance so that leaf thickness can be systemically targeted in crop improvement programs.
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    Optimizing photosynthesis by targeting light signaling transcriptional networks
    (Oxford University Press, 2026) Sanyal, Rajarshi; Ranjan, Aashish
    Light serves as a crucial environmental signal for plants besides providing energy for photosynthesis. Photomorphogenesis, light-induced plant developmental responses, involves photoreceptors perceiving light signals to initiate signaling cascades with downstream transcriptional networks. Moreover, light is also absorbed by photopigments to drive photosynthetic light reactions, providing energy for growth and metabolism. As light serves as a primary cue for both photomorphogenesis and photosynthesis, a crosstalk between the two processes is anticipated. While transcriptional regulation of photomorphogenesis is investigated in detail, our understanding of the transcriptional control of photosynthesis remains limited. Recent studies have shown the involvement of photoreceptors and key light-signaling transcription factors, such as PHYTOCHROME-INTERACTING FACTORs (PIFs) and ELONGATED HYPOCOTYL 5 (HY5), in the regulation of photosynthesis. This review not only highlights the transcriptional regulation of photosynthesis but also provides a broader perspective on the involvement of key transcription factors of photomorphogenesis in the regulation of photosynthesis. The review further discusses strategies to investigate and manipulate the light signaling transcriptional regulatory networks for optimizing photosynthetic efficiency.