scholarly journals Respiratory rates and freezing tolerance of embryos of Inga vera Willd. subsp. affinis (DC.) T.D. Penn. from different regions

2021 ◽  
Vol 43 ◽  
Author(s):  
Edmir Vicente Lamarca ◽  
Claudio José Barbedo
Keyword(s):  
Electrical Conductivity ◽  
Low Temperature ◽  
Freezing Tolerance ◽  
Low Temperatures ◽  
Temperature Tolerance ◽  
Recalcitrant Seeds ◽  
Energy Status ◽  
Low Temperature Tolerance ◽  
The Relationship ◽  
Storage Temperatures

ABSTRACT: Recalcitrant seeds are sensitive to desiccation and low storage temperatures, but there is a gradient of recalcitrance between different species and between populations of the same species. Therefore, tolerance to drying and low temperatures, as well as the respiratory rates of seeds, can be conditioned by the source of the material. The present study aimed to evaluate the relationship among desiccation and low temperature tolerance, and respiratory rates of Inga vera embryos from different regions. The embryos were submitted to three drying levels and incubated for up to fifteen days at -4, -2, 2 and 5 °C. Then, they were evaluated for respiration, germination and electrical conductivity. The embryos tolerated freezing at -4 °C since they were associated with certain levels of drying and a consequent change in the energy status of water. In conclusion, the conditions in which the embryos are formed define their degree of maturation at dispersal, hence their tolerance to desiccation and freezing.

Effects of temperature and salinity on survival of young-of-the-year Hudson River striped bass (Morone saxatilis): implications for optimal overwintering habitats

2002 ◽  
Vol 59 (5) ◽  
pp. 787-795 ◽  
Author(s):  
Thomas P Hurst ◽  
David O Conover
Keyword(s):  
Body Size ◽  
Low Temperature ◽  
Striped Bass ◽  
Low Temperatures ◽  
Morone Saxatilis ◽  
Hudson River ◽  
Temperature Tolerance ◽  
Low Temperature Tolerance ◽  
Energetic State ◽  
Young Of The Year

We examined the role of salinity, body size, and energetic state in determining low temperature tolerance of young-of-the-year (YOY) striped bass (Morone saxatilis) and used this information to map optimal overwintering habitat in the Hudson River estuary. A long-term experiment compared survival at 15 ppt and 30 ppt. In additional experiments, winter-acclimated fish were exposed to temperature declines (2.3°C·day–1 to 1°C·week–1) at salinities from 0 ppt to 35 ppt. Highest survival at low temperatures was consistently observed at intermediate salinities. These results suggest that the observed distribution of overwintering striped bass is related to physiological constraints on osmo regulatory ability at low temperatures. Low temperature tolerance appeared unrelated to body size and energetic state. Salinity profiles were used to describe the location and extent of optimal wintering habitats under various hydrographic regimes. The location of optimal habitats was displaced by over 27 km along the river axis because of variation in salinity regime. Changes in the availability of optimal habitat may be responsible for variation in recruitment to the Hudson River population. These results demonstrate the need to consider a holistic approach encompassing all seasons of the year in assessing habitat requirements of fishes.

scholarly journals Joint Transcriptomic and Metabolomic Analysis Reveals the Mechanism of Low Temperature Tolerance in Hosta Ventricosa

2021 ◽  
Author(s):  
QianQian Zhuang ◽  
Shaopeng Chen ◽  
ZhiXin Jua ◽  
Yao Yue
Keyword(s):  
Signal Transduction ◽  
Low Temperature ◽  
Low Temperatures ◽  
Temperature Tolerance ◽  
Differentially Expressed ◽  
Metabolomic Analysis ◽  
Temperature Changes ◽  
Low Temperature Tolerance ◽  
Temperature Damage ◽  
Hosta Ventricosa

Abstract Background: 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. Methods:This study used a combination of transcriptomic and metabolomic analysis to explore the mechanism of low temperature tolerance in H. ventricosa.Results: A total of 12 059 differentially expressed genes (DEGs) 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, H. ventricosa is mainly through the ion channels on the three cell membranes of COLD, CNGCs and CRLK to transmit Ca2+ inside and outside the cell to sense temperature changes, and stimulate SCRM to combine with DREB through the MAPK signal pathway and Ca2+ signal sensors such as CBL. Strengthen the low temperature resistance of H. ventricosa. 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.Conclusions: In H. ventricosa that is subjected to low temperature stress, temperature changes are perceived through 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.

scholarly journals Induction of Low Temperature Tolerance in Wheat by Pre-Soaking and Parental Treatment with Melatonin

Molecules ◽  
2021 ◽  
Vol 26 (4) ◽  
pp. 1192
Author(s):  
Hua Zhang ◽  
Lei Liu ◽  
Zongshuai Wang ◽  
Guozhong Feng ◽  
Qiang Gao ◽  
...  
Keyword(s):  
Low Temperature ◽  
Low Temperatures ◽  
Germination Rate ◽  
Grain Filling ◽  
Temperature Tolerance ◽  
Starch Degradation ◽  
Wheat Seedlings ◽  
Low Temperature Tolerance ◽  
Metabolism Enzymes ◽  
Parental Treatment

Low temperatures seriously depress germination and seedling establishment in wheat and it is of great significance to explore approaches to improve wheat tolerance to low temperatures. In this study, the effects of seed pre-soaking and parental treatment with melatonin on seed germination and low temperature tolerance during the early growing stage in wheat were studied. The results showed that pre-soaking with melatonin increased the germination rate, improved antioxidant capacity and accelerated starch degradation under low temperature, which alleviated low temperature-induced damage to the chloroplasts in coleoptiles of wheat seedlings. Parental melatonin treatment during grain filling stage significantly decreased the grain weight. Seeds from parental melatonin-treated plants showed higher germination rates and higher antioxidant enzyme activity than the control seeds under low temperature. In addition, parental treatment with melatonin modulated the activities of carbohydrate metabolism enzymes, which contributes to enhanced low temperature tolerance in wheat offspring. It was suggested that both seed pre-soaking and parental treatment with melatonin could be the effective approaches for low temperature tolerance induction in wheat.

HAPLOID SELECTION FOR LOW TEMPERATURE TOLERANCE OF TOMATO POLLEN

Genetics ◽  
1982 ◽  
Vol 101 (1) ◽  
pp. 129-137 ◽  
Author(s):  
Daniel Zamir ◽  
Steven D Tanksley ◽  
Richard A Jones
Keyword(s):  
Low Temperature ◽  
Low Temperatures ◽  
Pollen Grains ◽  
Temperature Tolerance ◽  
F1 Hybrid ◽  
Peruvian Andes ◽  
Low Temperature Tolerance ◽  
Selection For ◽  
Chromosome Segments ◽  
Haploid Selection

ABSTRACT Pollen grains were harvested from an interspecific F1 hybrid between the cultivated tomato, Lycopersicon esculentum Mill., and its wild relative Lycopersicon hirsutum Humb. & Bonpl., a low temperature tolerant accession originating from an altitude of 3200 m in the Peruvian Andes. The two species differ for electrophoretically-detectable loci that mark six (possibly seven) of the 12 tomato chromosomes. Isozyme analysis of the BC1 populations derived from controlled pollinations at normal and low temperatures indicates a significant skewing of allelic frequencies favoring two independent chromosome segments of L. hirsutum at low temperatures. The results demonstrate that gametophytic selection for low temperature tolerance of tomato pollen is determined, at least in part, by genes expressed in the haploid pollen.

Chilo suppressalis (striped rice stem borer).

2021 ◽  
Author(s):  
Koen Maes
Keyword(s):  
Low Temperature ◽  
East Asia ◽  
Low Temperatures ◽  
Stem Borer ◽  
Temperature Tolerance ◽  
Northern Territory ◽  
Chilo Suppressalis ◽  
Long Distance ◽  
Low Temperature Tolerance ◽  
Rice Stem Borer

Abstract This is one of the most important pests of rice in East Asia, India and Indonesia. In East Asia, C. suppressalis occurs together with Chilo hyrax and Chilo christophi. This pest was probably introduced in Spain and Hawaii by humans (Bleszynski, 1970). It is now also present in the Northern Territory of Australia. The species tolerates low to very low temperatures and is therefore present in temperate and subtropical Asia. This low temperature tolerance enables it to adapt to other regions. The fact that C. suppressalis has become established in France, Spain and Portugal indicates the potential for long-distance movements and there would seem to be a real danger that it could be introduced into Africa, or other ecologically favourable areas.

scholarly journals POPULATION VARIATION IN LOW-TEMPERATURE TOLERANCE OF ACER SACCHARINUM

HortScience ◽  
1995 ◽  
Vol 30 (2) ◽  
pp. 189b-189
Author(s):  
Paul E. Cappiello ◽  
John E. Preece
Keyword(s):  
Low Temperature ◽  
Cold Tolerance ◽  
Temperature Tolerance ◽  
Population Variation ◽  
Native Range ◽  
Acer Saccharinum ◽  
Low Temperature Tolerance ◽  
Single Clone ◽  
The Relationship

A single clone of Acer saccharinum was selected and propagated from each of 15 provenances across the plant native range. The clones were field grown in Carbondale, Ill., during the study period. Plants were sampled during Winter 1992-93 and 1993-94 and assayed for low-temperature tolerance. During both winters, plants exhibited greatest variation in tolerance around the November and April sampling dates. In midwinter, there was little variation observed and 13 of 15 clones were tolerant to at least -40C. The relationship among Acer saccharinum provenance and cold tolerance curves will be discussed.

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