Improving chilling tolerance in cold-sensitive crops,e.g.tomato,requires knowledge of the early molecular response to low temperature in these under-studied species.To elucidate early responding processes and regulato...Improving chilling tolerance in cold-sensitive crops,e.g.tomato,requires knowledge of the early molecular response to low temperature in these under-studied species.To elucidate early responding processes and regulators,we captured the transcriptional response at 30 minutes and 3 hours in the shoots and at 3 hours in the roots of tomato post-chilling from 24℃ to 4℃.We used a pre-treatment control and a concurrent ambient temperature control to reveal that majority of the differential expression between cold and ambient conditions is due to severely compressed oscillation of a large set of diurnally regulated genes in both the shoots and roots.This compression happens within 30 minutes of chilling,lasts for the duration of cold treatment,and is relieved within 3 hours of return to ambient temperatures.Our study also shows that the canonical ICE1/CAMTA-to-CBF cold response pathway is active in the shoots,but not in the roots.Chilling stress induces synthesis of known cryoprotectants(trehalose and polyamines),in a CBF-independent manner,and induction of multiple genes encoding proteins of photosystems I and II.This study provides nuanced insights into the organ-specific response in a chilling sensitive plant,as well as the genes influenced by an interaction of chilling response and the circadian clock.展开更多
In one of the most consequential biochemical reactions on earth,a pigment-protein complex known as photosystem Ⅱ(PSⅡ)in photosynthesis extracts electrons,protons,and oxygen from water using energy from sunlight.PSⅡ...In one of the most consequential biochemical reactions on earth,a pigment-protein complex known as photosystem Ⅱ(PSⅡ)in photosynthesis extracts electrons,protons,and oxygen from water using energy from sunlight.PSⅡ thereby sustains life on earth by harnessing the potential of two nearly inexhaustible raw materials:sunlight and water.The plant PSllis a membrane-embedded homodimer.Each monomer consists of around 28 unique protein subunits,157 chlorophylls,44 carotenoids,2 pheophytins,a heme,a non-heme iron,two quinones,and a Mn_(4)CaO_(5) cluster(Su et al.,2017;Cao et al.,2018).Within each monomeric complex,20 protein subunits constitute a core(Figure 1A).展开更多
文摘Improving chilling tolerance in cold-sensitive crops,e.g.tomato,requires knowledge of the early molecular response to low temperature in these under-studied species.To elucidate early responding processes and regulators,we captured the transcriptional response at 30 minutes and 3 hours in the shoots and at 3 hours in the roots of tomato post-chilling from 24℃ to 4℃.We used a pre-treatment control and a concurrent ambient temperature control to reveal that majority of the differential expression between cold and ambient conditions is due to severely compressed oscillation of a large set of diurnally regulated genes in both the shoots and roots.This compression happens within 30 minutes of chilling,lasts for the duration of cold treatment,and is relieved within 3 hours of return to ambient temperatures.Our study also shows that the canonical ICE1/CAMTA-to-CBF cold response pathway is active in the shoots,but not in the roots.Chilling stress induces synthesis of known cryoprotectants(trehalose and polyamines),in a CBF-independent manner,and induction of multiple genes encoding proteins of photosystems I and II.This study provides nuanced insights into the organ-specific response in a chilling sensitive plant,as well as the genes influenced by an interaction of chilling response and the circadian clock.
基金Our work is supported by grants to S.P.from the United States Department of Energy(DOE)(DE-SC0020639)the United States Department of Agriculture-National Institute of Food and Agriculture(USDA-NIFA)(Hatch:1013608)S.D.M.acknowledges USDA-NIFA for an EWD predoctoral fellowship(2021-67034-35183).
文摘In one of the most consequential biochemical reactions on earth,a pigment-protein complex known as photosystem Ⅱ(PSⅡ)in photosynthesis extracts electrons,protons,and oxygen from water using energy from sunlight.PSⅡ thereby sustains life on earth by harnessing the potential of two nearly inexhaustible raw materials:sunlight and water.The plant PSllis a membrane-embedded homodimer.Each monomer consists of around 28 unique protein subunits,157 chlorophylls,44 carotenoids,2 pheophytins,a heme,a non-heme iron,two quinones,and a Mn_(4)CaO_(5) cluster(Su et al.,2017;Cao et al.,2018).Within each monomeric complex,20 protein subunits constitute a core(Figure 1A).
