Seed thermoinhibition protects emerging seedlings from thermodamage by preventing seed germination at elevated temperatures. It had remained unknown how a seed fine-tunes its germination in response to temperature. Recently, Piskurewicz et al. demonstrated that endosperm phyB senses increased temperature, thereby facilitating PIF3-mediated abscisic acid (ABA) accumulation to inhibit germination and embryo elongation.
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Genome-wide association studies in lettuce reveal the interplay of seed age, color, and germination under high temperatures.
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U.S. Department of Agriculture, Agricultural Research Service, Beltsville, MD, 20705, USA.
Thermoinhibition, the suppression of seed germination by high temperatures, is an adaptive trait that ensures successful seedling establishment in natural environments. While beneficial for wild plants, thermoinhibition can adversely affect crop yields due to uneven and reduced germination rates, particularly in the face of climate change. To understand the genetic basis of thermoinhibition, we conducted a comprehensive genetic analysis of a diverse panel of Lactuca spp.
View Article and Find Full Text PDFChemical disruption of ABA signaling overcomes high-temperature inhibition of seed germination and enhances seed priming responses.
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Institute for Integrative Genome Biology, University of California, Riverside, Riverside, CA, United States of America.
Seed germination is critical to agricultural productivity because low germination rates and/or asynchronous germination negatively affect stand establishment and subsequent yields. Exposure to high temperatures during seed imbibition can decrease both germination synchrony and rates through an ABA-mediated process called thermoinhibition. Methods to reduce thermoinhibition would be agriculturally valuable, particularly with increasing global mean temperatures.
View Article and Find Full Text PDFSUMOylation of AL6 regulates seed dormancy and thermoinhibition in Arabidopsis.
New Phytol
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Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China.
DELAY OF GERMINATION1 (DOG1) is a critical regulator of seed dormancy and seed thermoinhibition. However, how DOG1 expression is regulated by post-translational modifications and how seeds transmit the high-temperature signal to DOG1 remain largely unknown. ALFIN1-like 6/7 (AL6/7) was previously found to repress DOG1 expression during seed imbibition.
View Article and Find Full Text PDFEvolutionary origin and functional investigation of the widely conserved plant PEBP gene STEPMOTHER OF FT AND TFL1 (SMFT).
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Genes of the family PHOSPHATIDYLETHANOLAMINE-BINDING PROTEINS (PEBP) have been intensely studied in plants for their role in cell (re)programming and meristem differentiation. Recently, sporadic reports of the presence of a new type of PEBP in plants became available, highly similar to the YY-PEBPs of prokaryotes. A comprehensive investigation of their spread, origin, and function revealed conservation across the plant kingdom.
View Article and Find Full Text PDFAdvance in the Thermoinhibition of Lettuce ( L.) Seed Germination.
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Guangdong Provincial Key Laboratory for Crop Germplasm Resources Preservation and Utilization, Agro-Biological Gene Research Center, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China.
Thermoinhibition refers to the inability of seeds to germinate when inhibited by high temperatures, but when environmental conditions return to normal, the seeds are able to germinate rapidly again, which is different from thermodormancy. Meanwhile, with global warming, the effect of the thermoinhibition phenomenon on the yield and quality of crops in agricultural production is becoming common. Lettuce, as a horticultural crop sensitive to high temperature, is particularly susceptible to the effects of thermoinhibition, resulting in yield reduction.
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