scholarly journals Effects of dormancy progression and low-temperature response on changes in the sorbitol concentration in xylem sap of Japanese pear during winter season

2013 ◽  
Vol 33 (4) ◽  
pp. 398-408 ◽  
Author(s):  
A. Ito ◽  
T. Sugiura ◽  
D. Sakamoto ◽  
T. Moriguchi
Keyword(s):  
Low Temperature ◽  
Xylem Sap ◽  
Winter Season ◽  
Temperature Response ◽  
Japanese Pear

Regulation of loquat fruit low temperature response and lignification involves interaction of heat shock factors and genes associated with lignin biosynthesis

2016 ◽  
Vol 39 (8) ◽  
pp. 1780-1789 ◽  
Author(s):  
Jiao-ke Zeng ◽  
Xian Li ◽  
Jing Zhang ◽  
Hang Ge ◽  
Xue-ren Yin ◽  
...  
Keyword(s):  
Heat Shock ◽  
Low Temperature ◽  
Temperature Response ◽  
Lignin Biosynthesis ◽  
Heat Shock Factors

Composition chimique de sèves xylémiques du genre Lycopersicon (Solanaceae) en relation avec l'environnement. I. Effet de la température

1990 ◽  
Vol 68 (9) ◽  
pp. 1942-1947 ◽  
Author(s):  
Philippe Brunet ◽  
Bruno Sarrobert ◽  
Nicole Paris-Pireyre ◽  
Ange-Marie Risterucci
Keyword(s):  
Amino Acids ◽  
Low Temperature ◽  
High Performance ◽  
Xylem Sap ◽  
Lycopersicon Hirsutum ◽  
Fresh Weight ◽  
Sensitive Species ◽  
Composition Chimique ◽  
Analytical Processing ◽  
Two Temperature

Two species of tomato, Lycopersicon esculentum Mill. var. EGE12P1 and Lycopersicon hirsutum Humb. & Bonpl. ecotype LA 1777, were submitted to two temperature treatments, 20 or 10 °C. After a short study of plant growth, we analysed the chemical composition (cations, anions, and amino acids) of xylem sap by high performance liquid chromatography. A comparison of fresh weight increase at 20 and 10 °C of both plant species showed that L. hirsutum was the least affected by low temperature. The volumes of secreted sap and the quantities of ions transported showed great disturbances in the sensitive species (L. esculentum), especially in the case of potassium. In xylem sap of both species studied, but only at 10 °C, we noticed the appearance of ammonium. The possibility of contamination during analytical processing was eliminated. Moreover, determinations of amino acids levels showed that ammonium did not arise from degradation of amides present in xylem sap. In any event, the proportion of nitrate absorbed and reduced in roots increased at low temperature; it is much more important in L. hirsutum and could constitute a tolerance factor to low temperatures. Key words: ammonium, low temperature, Lycopersicon, xylem sap.

scholarly journals Comparative transcriptome analysis of the cold resistance of the sterile rice line 33S

PLoS ONE ◽  
2022 ◽  
Vol 17 (1) ◽  
pp. e0261822
Author(s):  
Hongjun Xie ◽  
Mingdong Zhu ◽  
Yaying Yu ◽  
Xiaoshan Zeng ◽  
Guohua Tang ◽  
...  
Keyword(s):  
Low Temperature ◽  
Cold Resistance ◽  
Temperature Response ◽  
Enrichment Analysis ◽  
Abiotic Factor ◽  
Comparative Transcriptome ◽  
Important Species ◽  
Expression Of Genes ◽  
Nutrient Reserve ◽  
Cold Tolerant

Rice (Oryza sativa L.) is one of the most important species for food production worldwide. Low temperature is a major abiotic factor that affects rice germination and reproduction. Here, the underlying regulatory mechanism in seedlings of a TGMS variety (33S) and a cold-sensitive variety (Nipponbare) was investigated by comparative transcriptome. There were 795 differentially expressed genes (DEGs) identified only in cold-treated 33S, suggesting that 33S had a unique cold-resistance system. Functional and enrichment analysis of these DEGs revealed that, in 33S, several metabolic pathways, such as photosynthesis, amino acid metabolism, secondary metabolite biosynthesis, were significantly repressed. Moreover, pathways related to growth and development, including starch and sucrose metabolism, and DNA biosynthesis and damage response/repair, were significantly enhanced. The expression of genes related to nutrient reserve activity were significantly up-regulated in 33S. Finally, three NAC and several ERF transcription factors were predicted to be important in this transcriptional reprogramming. This present work provides valuable information for future investigations of low-temperature response mechanisms and genetic improvement of cold-tolerant rice seedlings.

scholarly journals Exergy Analyses of Low-Temperature District Heating Systems With Different Sanitary Hot-Water Boosters

Entropy ◽  
2019 ◽  
Vol 21 (4) ◽  
pp. 388
Author(s):  
Poredoš ◽  
Kitanovski ◽  
Poredoš
Keyword(s):  
Low Temperature ◽  
Winter Season ◽  
District Heating ◽  
Intersection Point ◽  
Exergy Efficiency ◽  
Hot Water ◽  
Heating Systems ◽  
District Heating Systems ◽  
Different Types ◽  
Exergy Analyses

This paper presents an exergy-efficiency analysis of low-temperature district heating systems (DHSs) with different sanitary hot-water (SHW) boosters. The required temperature of the sanitary hot water (SHW) was set to 50 °C. The main objective of this study was to compare the exergy efficiencies of a DHS without a booster to DHSs with three different types of boosters, i.e., electric-, gas-boiler- and heat-pump-based, during the winter and summer seasons. To achieve this, we developed a generalized model for the calculation of the exergy efficiency of a DHS with or without the booster. The results show that during the winter season, for a very low relative share of SHW production, the DHS without the booster exhibits favorable exergy efficiencies compared to the DHSs with boosters. By increasing this share, an intersection point above 45 °C for the supply temperatures, at which the higher exergy efficiency of a DHS with a booster prevails, can be identified. In the summer season the results show that a DHS without a booster at a supply temperature above 70 °C achieves lower exergy efficiencies compared to DHSs with boosters at supply temperatures above 40 °C. The results also show that ultra-low supply and return temperatures should be avoided for the DHSs with boosters, due to higher rates of entropy generation.

Temperature Regulation of the Development of Frost Hardiness in Pinus radiata D. Don

1983 ◽  
Vol 10 (6) ◽  
pp. 539 ◽  
Author(s):  
DH Greer
Keyword(s):  
Low Temperature ◽  
Temperature Response ◽  
Frost Hardiness ◽  
Natural Environments ◽  
Response Model ◽  
Night Temperature ◽  
Rate Of Development ◽  
Relative Contribution ◽  
Hardening Process ◽  
Hardening Treatment

The development of frost hardiness in seedlings of P. radiata was followed using a photoperiod of 9 h and a constant day temperature of 12°C. The seedlings were preconditioned to a night temperature of 6.5°C for 35 days and 4°C for 7 days. The temperature was then reduced to -4°C for 66 days in one hardening treatment (designated 12/-4°C) and to 3°C for 136 days in another (designated 12/3°C). At the end of those periods, the night temperature was increased back to 6.5°C for a further 15 days. Frost hardiness was determined at regular intervals by exposing the seedlings to a series of artificial frosts. During the low temperature regime, frost hardiness developed continuously in seedlings from both treatments, from -5 to -9.5°C in the 12/3°C treatment and to -16.5°C in the 12/-4°C treatment. The rate of development of frost hardiness was constant at constant temperatures. Using a temperature response model, specific rates of hardening were estimated for both this and an earlier experiment, and found to be approximately linear against temperature. The analysis establishes that temperature controls the hardening process of P. radiata by regulating the rate of development of frost hardiness. Frost hardiness was also shown to be related to thermal time. Before this relationship could be useful in predicting frost hardiness of field-grown seedlings, the relative contribution of the photoperiod-induced and temperature-induced hardening in natural environments needs to be more clearly defined.

scholarly journals Comparative Transcriptome Analysis of the Less-Dormant Taiwanese Pear and the Dormant Japanese Pear during Winter Season

PLoS ONE ◽  
2015 ◽  
Vol 10 (10) ◽  
pp. e0139595 ◽  
Author(s):  
Yoshihiro Takemura ◽  
Katsuou Kuroki ◽  
Yoji Shida ◽  
Shungo Araki ◽  
Yukari Takeuchi ◽  
...  
Keyword(s):  
Transcriptome Analysis ◽  
Winter Season ◽  
Japanese Pear ◽  
Comparative Transcriptome ◽  
Comparative Transcriptome Analysis

Low temperature effects on growth and physiology specific to a "grass-clump" dwarf wheat hybrid

1972 ◽  
Vol 50 (2) ◽  
pp. 253-261 ◽  
Author(s):  
J. D. Mahon ◽  
D. T. Canvin
Keyword(s):  
Low Temperature ◽  
Shoot Growth ◽  
Growth Habit ◽  
Temperature Response ◽  
Dry Weight ◽  
Growth Responses ◽  
Meristematic Region ◽  
Meristematic Activity ◽  
Dwarf Wheat ◽  
Induced Changes

The growth habit of "grass-clump" dwarf wheat plants can be affected by extremely short 16° treatments if given repeatedly. To localize the earliest growth responses in plants of one such hybrid (Mql × KF 1), the temperature sensitivity of plants of different ages, and the earliest temperature-induced changes in growth, development, and shoot physiology were investigated and compared with the responses of normal wheat plants.Mql × KF 1 plants growing at 26° responded to progressively shorter 16° treatments as they aged and plants exposed to 16° after 10 days growth at 26° were unable to recover from low temperature treatments of 3–5 days duration. Although shoot growth (as dry weight) of Mql × KF 1 stopped abruptly after 7 days at 16°, root growth (as dry weight) continued for at least 15 days. The rates of CO2 and water vapor exchange in individual leaves responded to low temperature similarly in both the dwarf and normal plants and did not markedly decrease until after 4 days at 16°. The most rapid low temperature response specific to Mql × KF 1 plants was cessation in primary tiller development immediately after the beginning of 16° exposure. It is proposed that the primary 16° effect is on the shoot meristematic region and that other changes in growth and physiology result from the lack of meristematic activity in the young growing region.

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