scholarly journals Freezing Tolerance and Nonstructural Carbohydrate Composition of Carpetgrass (Axonopus affinis Chase)

HortScience ◽  
2000 ◽  
Vol 35 (2) ◽  
pp. 187-189 ◽  
Author(s):  
Edward Bush ◽  
Paul Wilson ◽  
Dennis Shepard ◽  
James McCrimmon
Keyword(s):  
Low Temperature ◽  
Environmental Factors ◽  
Baton Rouge ◽  
Dry Weight ◽  
Temperature Tolerance ◽  
Nonstructural Carbohydrates ◽  
Carbohydrate Composition ◽  
Low Temperature Tolerance ◽  
Nonstructural Carbohydrate ◽  
Winter Temperatures

An experiment to determine the nonstructural carbohydrate composition and nodal survival (LT50) of common carpetgrass was conducted between 1993 and 1994 at Baton Rouge, La. Nonstructural carbohydrates in stolons were primarily sucrose [70-130 mg·g-1 dry weight (DW)] and starch (8-33 mg·g-1 DW). Total nonstructural carbohydrate (TNC) composition of stolons ranged between 30 to 165 mg·g-1 DW. Node survival following exposure to 2 °C ranged from 0% in August-sampled grass to 48% in December. The LT50 following acclimation under field conditions was -2 to -4 °C. Environmental factors influenced nonstructural carbohydrate composition, partitioning, and node survival. No relationship between TNC concentration and low-temperature tolerance was found. This research confirms previous reports that low-temperature tolerance of carpetgrass is very poor, and its culture may be limited to geographical areas having moderate winter temperatures.

scholarly journals Putrescine Improve Low Temperature Tolerance of Fennel (Foeniculum Vulgare Mill.) Seeds

2015 ◽  
Vol 48 (1) ◽  
pp. 69-76 ◽  
Author(s):  
S.H. Mustafavi ◽  
F. Shekari ◽  
A. Abbasi
Keyword(s):  
Low Temperature ◽  
Dry Weight ◽  
Germination Percentage ◽  
Temperature Tolerance ◽  
Foeniculum Vulgare ◽  
Low Temperature Tolerance ◽  
Root And Shoot Length ◽  
Two Samples ◽  
Germination Behaviour ◽  
High Concentrations

Abstract The effects of polyamine priming on the germination behaviour of fennel at low temperatures were investigated. For preparing the putrescine pretreatments, seeds were divided into four parts. Two samples primed into putrescine (10 or 20 ppm) for 24 h, other samples were as controls. In order to eliminate the effect of water from test results, seeds were soaked in water only. After the priming, seeds were dried and used for germination test at 10 and 20 ºC. Except for seedling dry weight, all of the priming treatments improved germination performance and seedling growth of fennel seeds. Maximum germination percentage was achieved by 10 ppm Put application and lower value was observed in control seeds. About the energy of germination and mean germination time, polyamine treatments had better effect than hydropriming, but similar results was observed from seeds treated by 10 ppm Put and hydroprime on root and shoot length. Results showed that adequate presence of Put in the priming media had better than priming with water only. However, high concentrations of Put had not significant effect as well as 10 ppm Put. These results indicated that 10 ppm Put priming could be as an effective method to improve low temperature tolerance of fennel seeds.

scholarly journals Low temperature tolerance of human embryonic stem cells

2006 ◽  
pp. 124-129 ◽  
Author(s):  
Boon Chin Heng ◽  
Kumar Jayaseelan Vinoth ◽  
Hua Liu ◽  
Manoor Prakash Hande ◽  
Tong Cao
Keyword(s):  
Stem Cells ◽  
Embryonic Stem Cells ◽  
Low Temperature ◽  
Human Embryonic Stem Cells ◽  
Embryonic Stem ◽  
Temperature Tolerance ◽  
Low Temperature Tolerance

scholarly journals Joint transcriptomic and metabolomic analysis reveals the mechanism of low-temperature tolerance in Hosta ventricosa

PLoS ONE ◽  
2021 ◽  
Vol 16 (11) ◽  
pp. e0259455
Author(s):  
QianQian Zhuang ◽  
Shaopeng Chen ◽  
ZhiXin Jua ◽  
Yue Yao
Keyword(s):  
Signal Transduction ◽  
Low Temperature ◽  
Temperature Tolerance ◽  
Differentially Expressed ◽  
Metabolomic Analysis ◽  
Temperature Changes ◽  
Low Temperature Tolerance ◽  
Content Ratio ◽  
Temperature Damage ◽  
Hosta Ventricosa

Hosta ventricosa is a robust ornamental perennial plant that can tolerate low temperatures, and which is widely used in urban landscaping design in Northeast China. However, the mechanism of cold-stress tolerance in this species is unclear. A combination of transcriptomic and metabolomic analysis was used to explore the mechanism of low-temperature tolerance in H. ventricosa. A total of 12 059 differentially expressed genes and 131 differentially expressed metabolites were obtained, which were mainly concentrated in the signal transduction and phenylpropanoid metabolic pathways. In the process of low-temperature signal transduction, possibly by transmitting Ca2+ inside and outside the cell through the ion channels on the three cell membranes of COLD, CNGCs and CRLK, H. ventricosa senses temperature changes and stimulates SCRM to combine with DREB through the MAPK signal pathway and Ca2+ signal sensors such as CBL, thus strengthening its low-temperature resistance. The pathways of phenylpropanoid and flavonoid metabolism represent the main mechanism of low-temperature tolerance in this species. The plant protects itself from low-temperature damage by increasing its content of genistein, scopolentin and scopolin. It is speculated that H. ventricosa can also adjust the content ratio of sinapyl alcohol and coniferyl alcohol and thereby alter the morphological structure of its cell walls and so increase its resistance to low temperatures.When subjected to low-temperature stress, H. ventricosa perceives temperature changes via COLD, CNGCs and CRLK, and protection from low-temperature damage is achieved by an increase in the levels of genistein, scopolentin and scopolin through the pathways of phenylpropanoid biosynthesis and flavonoid biosynthesis.

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