Heat-Responsive Photosynthetic and Signaling Pathways in Plants: Insight from Proteomics

Abstract

Heat stress is a major abiotic stress posing a serious threat to plants. Heat-responsive mechanisms in plants are complicated and fine-tuned. Heat signaling transduction and photosynthesis are highly sensitive. Therefore, a thorough understanding of the molecular mechanism in heat stressed-signaling transduction and photosynthesis is necessary to protect crop yield. Current high-throughput proteomics investigations provide more useful information for underlying heat-responsive signaling pathways and photosynthesis modulation in plants. Several signaling components, such as guanosine triphosphate (GTP)-binding protein, nucleoside diphosphate kinase, annexin, and brassinosteroid-insensitive I-kinase domain interacting protein 114, were proposed to be important in heat signaling transduction. Moreover, diverse protein patterns of photosynthetic proteins imply that the modulations of stomatal CO2 exchange, photosystem II, Calvin cycle, ATP synthesis, and chlorophyll biosynthesis are crucial for plant heat tolerance.

Carbon assimilation in oak (Quercus spp.) populations under acute and chronic high-temperature stress

“…Comprehensive plant response to high temperature is a result of different abiotic as well as biotic parameters including intensity/temperature of heat waves, exposure time, and especially plant species (Wang et al 2017). The main focus in our research was the evaluation of physiological, primarily photosynthetic response of oak populations originating from geographically different habitats (populations) to high temperature stress.…”

“…Supraoptimal temperatures may not directly and structurally disrupt photosynthetic tissue, but also, their interference in a complex photosynthetic process could be manifested in disturbance of general plant physiological performance, mostly expressed through affecting their carbon balance, nutrient uptake and cycling, and stress compensation mechanisms (Rennenberg et al 2006). Reduction of carbon photosynthetic assimilation is a direct consequence of a reduced production of ATP and NADPH in light reactions, as well as decreased intercellular CO2 concentration (Ci) under heat stress (Wang et al 2017). Since the PSII is one of the primarily targets of heat stress, measuring its efficiency and determining damage by chlorophyll (Chl) a fluorescence might provide a valuable information on its stability and functionality (Jedmowski et al 2015).…”

MdATG18a overexpression improves basal thermotolerance in transgenic apple by decreasing damage to chloroplasts

“…Chlorophyll fluorescence measurements have always been used to study the effect of heat stress on photosynthesis in plants 21,31 . We measured the maximum photochemical efficiency of PSII photochemistry (Fv/Fm), which represents the amount of absorbed energy trapped in PSII reaction centers 32 .…”

Mecanismos de respuesta al estrés abiótico: hacia una perspectiva de las especies forestales

“…Aumentos en la temperatura ambiental de 10 -15 °C se consideran estrés o choque térmico, que de manera general ocasiona la desnaturalización y agregación de proteínas, aumento en la fluidez de los lípidos de las membranas celulares (Wahid et al, 2007), trastorno de la organización de los microtúbulos y de la división celular (Smertenko et al, 1997), alteraciones en la fotosíntesis, metabolismo primario y secundario, así como de los lípidos (Xu et al, 2006); y por consiguiente, un retraso en el desarrollo y crecimiento o la muerte (Mathur y Jajoo, 2014). Para una revisión exhaustiva de la señalización y respuesta a las altas temperaturas, se recomienda consultar Wahid et al (2007), Mittler et al (2012) y Wang et al (2017).…”

“…Aunque los mecanismos precisos de detección de calor y señalización en plantas aún se ignoran, se sabe que moléculas como las proteínas ligadas a guanosín-trifosfato, nucleósido difosfato cinasa, anexina y cinasas brasinosteroides participan en la transducción de señales (Wang et al, 2017).…”