scholarly journals Physiological Mechanisms Only Tell Half Story: Multiple Biological Processes are involved in Regulating Freezing Tolerance of Imbibed Lactuca sativa Seeds

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Ganesh K. Jaganathan ◽  
Yingying Han ◽  
Weijie Li ◽  
Danping Song ◽  
Xiaoyan Song ◽  
...  
Keyword(s):  
Freezing Tolerance ◽  
Lactuca Sativa ◽  
Biological Processes ◽  
Physiological Mechanisms

scholarly journals Genetic and physiological mechanisms of freezing tolerance in locally adapted populations of a winter annual

2019 ◽  
Vol 107 (2) ◽  
pp. 250-261 ◽  
Author(s):  
Brian J. Sanderson ◽  
Sunchung Park ◽  
M. Inam Jameel ◽  
Joshua C. Kraft ◽  
Michael F. Thomashow ◽  
...  
Keyword(s):  
Freezing Tolerance ◽  
Physiological Mechanisms ◽  
Winter Annual

Freezing tolerance in hydrated lettuce (Lactuca sativa) seeds is dependent on cooling rate but not imbibition temperature

2016 ◽  
Vol 38 (2) ◽  
Author(s):  
Ganesh K. Jaganathan ◽  
Yingying Han ◽  
Guorong Wu ◽  
Baolin Liu
Keyword(s):  
Cooling Rate ◽  
Freezing Tolerance ◽  
Lactuca Sativa

scholarly journals Genetic and physiological mechanisms of freezing tolerance in locally adapted populations of a winter annual

2019 ◽  
Author(s):  
Brian J. Sanderson ◽  
Sunchung Park ◽  
M. Inam Jameel ◽  
Joshua C. Kraft ◽  
Michael F. Thomashow ◽  
...  
Keyword(s):  
Local Adaptation ◽  
Freezing Tolerance ◽  
Adaptive Response ◽  
Sequence Polymorphism ◽  
Loss Of Function ◽  
Physiological Mechanisms ◽  
Naturally Occurring ◽  
Before And After ◽  
Winter Annual ◽  
Insight Into

ABSTRACTPremise of the studyDespite myriad examples of local adaptation, the phenotypes and genetic variants underlying such adaptive differentiation are seldom known. Recent work on freezing tolerance and local adaptation in ecotypes of Arabidopsis thaliana from Sweden and Italy provides the essential foundation for uncovering the genotype-phenotype-fitness map for an adaptive response to a key environmental stress.MethodsHere we examine the consequences of a naturally occurring loss of function (LOF) mutation in an Italian allele of the gene that encodes the transcription factor CBF2, which underlies a major freezing tolerance locus. We used four lines with a Swedish genetic background, each containing a LOF CBF2 allele. Two lines had introgression segments containing of the Italian CBF2 allele, and two were created using CRISPR-Cas9. We used a growth chamber experiment to quantify freezing tolerance and gene expression both before and after cold acclimation.Key resultsFreezing tolerance was greater in the Swedish (72%) compared to the Italian (11%) ecotype, and all four experimental CBF2 LOF lines had reduced freezing tolerance compared to the Swedish ecotype. Differential expression analyses identified ten genes for which all CBF2 LOF lines and the IT ecotype showed similar patterns of reduced cold responsive expression compared to the SW ecotype.ConclusionsWe identified ten genes that are at least partially regulated by CBF2 that may contribute to the differences in cold acclimated freezing tolerance between the Italian and Swedish ecotypes. These results provide novel insight into the molecular and physiological mechanisms connecting a naturally occurring sequence polymorphism to an adaptive response to freezing conditions.

Comparative transcriptome analysis of five Medicago varieties reveals the genetic signals underlying freezing tolerance

2019 ◽  
Vol 70 (3) ◽  
pp. 273
Author(s):  
Lijun Xu ◽  
Xuejuan Tang ◽  
Bo Wang ◽  
Xiaoping Xin ◽  
Qizhong Sun ◽  
...  
Keyword(s):  
Molecular Evolution ◽  
Freezing Tolerance ◽  
Calcium Binding ◽  
De Novo ◽  
Transcriptome Assembly ◽  
Synonymous Substitution ◽  
Biological Processes ◽  
Medicago Species ◽  
Go Terms ◽  
Binding Cell

Medicago plants such as M. sativa (lucerne, alfalfa) are important forage all over the world. Freezing-tolerance capacity is one of the key determinants of the survival and production of Medicago. In order to explore the molecular basis underlying freezing tolerance, we sequenced the root transcriptomes of five Medicago varieties belonging to two species, M. sativa and M. varia, and compared their gene expression and molecular evolution. A range of 19.5–23.8 Gb clean bases was obtained, and de novo transcriptome assembly generated 205238–268520 unigenes. The GO (Gene Ontology) terms of basic biological processes such as binding, cell and metabolism were most represented for the unigenes. In addition, a large number of unigenes related to GO terms and KEGG (Kyoto Encyclopedia of Genes and Genomes) pathways of membrane, signalling, transcription and response to stimulus were identified in functional annotation. In total, 12455 orthologs were identified among the five Medicago varieties. Among the orthologs, many unigenes that directly related to freezing tolerance were highly expressed in all five varieties, including genes for WRKY transcription factors, calcium-binding factors, and antioxidant enzymes such as catalase and ascorbate peroxidase. Molecular evolution testing showed that the unigenes involved in membrane shared high Ka/Ks (non-synonymous/synonymous substitution rate) across all the five Medicago varieties. Positively selected genes were mainly involved in transcription regulation, metabolism and signal transduction. Our study provides a large transcriptome dataset in the Medicago genus and brings new insights into the freezing tolerance for Medicago species.

Improving freezing tolerance of transgenic tobacco expressing sucrose: sucrose 1-fructosyltransferase gene from Lactuca sativa

2007 ◽  
Vol 89 (1) ◽  
pp. 37-48 ◽  
Author(s):  
Hui-Juan Li ◽  
Ai-Fang Yang ◽  
Xue-Cheng Zhang ◽  
Feng Gao ◽  
Ju-Ren Zhang
Keyword(s):  
Transgenic Tobacco ◽  
Freezing Tolerance ◽  
Lactuca Sativa

Biopsychology

2020 ◽  
pp. 1-14
Author(s):  
Barre Vijaya Prasad
Keyword(s):  
Biological Psychology ◽  
Mental Activity ◽  
The Body ◽  
Biological Processes ◽  
Physiological Mechanisms ◽  
Mental Processes ◽  
Biological Basis ◽  
And Behavior

The study of biopsychology seeks to describe the physiological mechanisms of the body that mediate our movement and mental activity. Biopsychology focuses on biological basis of behavior (i.e., how brain and other biological processes affect psychological behaviors). Biopsychology is also known as biological psychology or psychobiology. Biopsychology is the application of the principles of biology to the study of mental processes and behavior that is the study of psychology in terms of bodily mechanisms.

scholarly journals Freezing Tolerance in Hydrated Lactuca sativa (L) Seed: A Model to Explain Observed Variation Between Seed Lots

1983 ◽  
Vol 52 (2) ◽  
pp. 266-266
Author(s):  
P. D. KEEFE ◽  
K. G. MOORE
Keyword(s):  
Freezing Tolerance ◽  
Lactuca Sativa ◽  
Lactuca Sativa L

Biochemical and physiological mechanisms related to cold acclimation and enhanced freezing tolerance in poplar plantlets

2005 ◽  
Vol 125 (1) ◽  
pp. 82-94 ◽  
Author(s):  
Jenny Renaut ◽  
Lucien Hoffmann ◽  
Jean-Francois Hausman
Keyword(s):  
Cold Acclimation ◽  
Freezing Tolerance ◽  
Physiological Mechanisms

Freezing Tolerance in Hydrated Lactuca sativa (L) Seed: A Model to Explain Observed Variation Between Seed Lots

1983 ◽  
Vol 51 (3) ◽  
pp. 373-383 ◽  
Author(s):  
P. D. KEEFE ◽  
K. G. MOORE
Keyword(s):  
Freezing Tolerance ◽  
Lactuca Sativa ◽  
Lactuca Sativa L

Physiological mechanisms and adaptation strategies of Lactuca sativa L. in response to Olea europaea L. and Ficus carica L. allelochemicals

2022 ◽  
Vol 147 ◽  
pp. 106-118
Author(s):  
Afef Ladhari ◽  
Armando Zarrelli ◽  
Maria Chiara Di Meo ◽  
Mouldi Ghannem ◽  
Mehdi Ben Mimoun
Keyword(s):  
Lactuca Sativa ◽  
Olea Europaea ◽  
Adaptation Strategies ◽  
Ficus Carica ◽  
Physiological Mechanisms ◽  
Olea Europaea L ◽  
Lactuca Sativa L ◽  
Olea Europaéa
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