Low temperature requirement for embryonic development of Itasenpara bitterlingAcheilognathus longipinnis

2006 ◽  
Vol 305A (10) ◽  
pp. 823-829 ◽  
Author(s):  
Kazuhiko Uehara ◽  
Koichi Kawabata ◽  
Hiromi Ohta
Keyword(s):  
Low Temperature ◽  
Embryonic Development ◽  
Temperature Requirement

scholarly journals Molecular Engineering for High-Performance Fullerene Broadband Photodetector

2021 ◽  
Author(s):  
Mingming Su ◽  
Yajing Hu ◽  
Ao Yu ◽  
Zhiyao Peng ◽  
Wangtao Long ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Low Temperature ◽  
Electron Acceptor ◽  
Photoinduced Electron Transfer ◽  
High Performance ◽  
Organic Molecules ◽  
Low Cost ◽  
Molecular Engineering ◽  
Temperature Requirement ◽  
High Flexibility

Broadband photodetectors fabricated with organic molecules have the advantages of low cost, high flexibility, easy processing and low-temperature requirement. Fullerene molecules, due to the electron acceptor and photoinduced electron transfer...

scholarly journals The influence of difference temperature against the rate of embryonic development and larval abnormality of Cantik Grouper (Epinephelus sp.)

2019 ◽  
Vol 2 (1) ◽  
pp. 16
Author(s):  
Aprisianus Julkarman Simbolon ◽  
Ganjar Adhywirawan Sutarjo ◽  
Hariyadi Hariyadi
Keyword(s):  
Low Temperature ◽  
Embryonic Development ◽  
Incubation Temperature ◽  
Temperature Treatment ◽  
Optimum Temperature ◽  
Long Time ◽  
Epinephelus Fuscoguttatus ◽  
Low Levels ◽  
Difference Temperature ◽  
F 31

Cantikgrouper is the hybridization results grouper or cross-breeding between Epinephelus fuscoguttatus as a female and Epinephelus microdon as a male. The main barriers faced in the development of this commodity is still low levels of spawning up to seeding grouper. Based on the background, this study aimed to investigate optimum temperature observations against the rate of embryonic development Epinephelus sp.larvae. This study used the results of artificial spawning eggs.The fertilized eggs were incubated on six pieces of the container temperature treatment;each treatment there was repeated three times.The incubation temperature was kept on (A) 21-22°C; (B) 23-24°C; (C) 25-26°C; (D) 27-28°C; (E) 29-30°C; (F) 31-32°C. Results showed that eggswere incubated at a temperature of 21-22 ℃ embryonic development to a halt in the blastula, and temperature 23-24°C stalled on phasemyomere embryos. The low-temperature incubation period lasts a long time. Temperature 25-26°C needed 18 hours 6 minutes by 8.33% abnormality rate. Temperature 27-28°C needed 16 hours to hatch witha degree of abnormality of 7.6%. Temperature 29-30°C needed 15 hours 1 minute for the hatch tothe degree of abnormality of 5.33%. The 31-32°C temperature needed 14 hours 6 minutes to hatch witha degree of abnormality of 17.3%. The limits of tolerance for the incubation of the eggs ofcantik grouper (Epinephelusspp.) were 26-32°C.The best temperature of each treatment were obtained at a temperature of 29-30°C. Based on our results, it concluded that the changing temperature affected how long eggs could hatch.

Morphological and physiological dormancy in seeds of Aegopodium podagraria (Apiaceae) broken successively during cold stratification

2009 ◽  
Vol 19 (2) ◽  
pp. 115-123 ◽  
Author(s):  
Filip Vandelook ◽  
Nele Bolle ◽  
Jozef A. Van Assche
Keyword(s):  
Low Temperature ◽  
Seedling Emergence ◽  
Early Spring ◽  
Temperate Climate ◽  
Cold Stratification ◽  
Dormancy Breaking ◽  
Morphophysiological Dormancy ◽  
Temperature Requirement ◽  
Physiological Dormancy ◽  
Chilling Period

AbstractA low-temperature requirement for dormancy break has been observed frequently in temperate-climate Apiaceae species, resulting in spring emergence of seedlings. A series of experiments was performed to identify dormancy-breaking requirements of Aegopodium podagraria, a nitrophilous perennial growing mainly in mildly shaded places. In natural conditions, the embryos in seeds of A. podagraria grow in early winter. Seedlings were first observed in early spring and seedling emergence peaked in March and April. Experiments using temperature-controlled incubators revealed that embryos in seeds of A. podagraria grow only at low temperatures (5°C), irrespective of a pretreatment at higher temperatures. Seeds did not germinate immediately after embryo growth was completed, instead an additional cold stratification period was required to break dormancy completely. Once dormancy was broken, seeds germinated at a range of temperatures. Addition of gibberellic acid (GA3) had a positive effect on embryo growth in seeds incubated at 10°C and at 23°C, but it did not promote germination. Since seeds of A. podagraria have a low-temperature requirement for embryo growth and require an additional chilling period after completion of embryo growth, they exhibit characteristics of deep complex morphophysiological dormancy.

Flower initiation in pasture legumes. II. Geographical implications of cold temperature requirements of varieties of Trifolium subterraneum L.

1955 ◽  
Vol 6 (2) ◽  
pp. 245 ◽  
Author(s):  
Y Aitken
Keyword(s):  
Low Temperature ◽  
Trifolium Subterraneum ◽  
Growing Season ◽  
Flower Initiation ◽  
Summer Drought ◽  
Productive Capacity ◽  
Northern Australia ◽  
Mild Winter ◽  
Temperature Requirement ◽  
Temperature Requirements

In Trifolium subterraneum L. (subterranean clover) the low temperature requirements of its range of varieties, together with the mild winter of southern Australia, result in a lengthened growing season compared with that usual in northern Europe, and hence in greater productivity. Over much of southern Australia, some degree of summer drought prevents the use or reduces the yield of perennial species and so the productive capacity of this particular clover has made it of major importance in pastures. The low temperature requirement, however, reduces the value of the species as a self-regenerating annual where temperatures of both summer and winter seasons are too high for flower initiation. This occurs with the later varieties when sown in northern Australia. Temperatures of the summer growing season in the tropics are likely to be too high even for the short low temperature requirement of the earliest flowering group, with its high critical upper margin of about 75°F mean weekly temperature. The dry winter months are cooler, and, if water supply is available, flower initiation is possible, though retarded with consequent leafiness of the plant. Hence in northern Australia, only varieties in the early flowering group may be of use in pastures, and then only in the cooler parts of the region.

scholarly journals Production of Didymella rabiei Pseudothecia and Dispersal of Ascospores in a Mediterranean Climate

2005 ◽  
Vol 95 (11) ◽  
pp. 1279-1286 ◽  
Author(s):  
E. Gamliel-Atinsky ◽  
D. Shtienberg ◽  
H. Vintal ◽  
Y. Nitzni ◽  
A. Dinoor
Keyword(s):  
Low Temperature ◽  
Environmental Conditions ◽  
Low Temperatures ◽  
Mediterranean Climate ◽  
Temperature Requirement ◽  
Trap Plants ◽  
Series Of Experiments ◽  
The Mediterranean ◽  
Stem Segments

Temperature and wetness conditions required for development and maturation of Didymella rabiei pseudothecia were determined in a series of experiments conducted in controlled-environmental conditions. Initial stages of pseudothecium formation occurred at temperatures ranging from 5 to 15°C. Incubation at low temperatures was essential for subsequent pseudothecium maturation. This requirement was satisfied for chickpea stem segments incubated at 5 or 10°C for three consecutive weeks or during periods of 3 or 5 days, separated by periods at higher temperatures. Following the low-temperature requirement, subsequent pseudothecium development was independent of temperature in the range tested (5 to 20°C). Wetness was essential for pseudothecium production: pseudothecia formed and matured on stem segments maintained continuously wet but also on those exposed to periods of three or five wet days, separated by dry periods. The dispersal of D. rabiei ascospores was studied using chickpea plants as living traps in the field. Trap plants were infected mainly when exposed during rain but also in rainless periods. Results of this study enabled us to describe the developmental events leading to the production of the teleomorph stage and the dispersal of ascospores by D. rabiei in the Mediterranean climate of Israel.

scholarly journals High- and low-temperature manipulation during late incubation: Effects on embryonic development, the hatching process, and metabolism in broilers

2010 ◽  
Vol 89 (12) ◽  
pp. 2678-2690 ◽  
Author(s):  
H. Willemsen ◽  
B. Kamers ◽  
F. Dahlke ◽  
H. Han ◽  
Z. Song ◽  
...  
Keyword(s):  
Low Temperature ◽  
Embryonic Development ◽  
Hatching Process ◽  
Temperature Manipulation

Low temperature requirement for saprophytic flax rust cultures

1969 ◽  
Vol 47 (10) ◽  
pp. 1637-1638 ◽  
Author(s):  
Franziska L. M. Turel
Keyword(s):  
Low Temperature ◽  
Melampsora Lini ◽  
Temperature Requirement

Melampsora lini (Pers.) Lév., races Nos. 3 and 210, grow better at 16 °C than at 17–17.5 °C. Mycelial cultures of race No. 3 were seriously damaged and most of them stopped growing altogether after being kept at 24 °C for 30 to 45 min for transfer.

Effects of Low Temperature on Embryonic Development of Sceloporus Lizards

Copeia ◽  
1997 ◽  
Vol 1997 (4) ◽  
pp. 827 ◽  
Author(s):  
Robin M. Andrews ◽  
Carl P. Qualls ◽  
Barbara R. Rose
Keyword(s):  
Low Temperature ◽  
Embryonic Development

EFFECTS OF SHORT PERIODS OF LOW TEMPERATURE STRESS AT 17 DAYS INCUBATION ON HATCHABILITY AND EMBRYONIC DEVELOPMENT

1973 ◽  
Vol 53 (2) ◽  
pp. 219-227
Author(s):  
C. K. LEVENICK ◽  
P. A. KONDRA
Keyword(s):  
Low Temperature ◽  
Embryonic Development ◽  
Temperature Stress ◽  
Treatment Effect ◽  
Low Temperature Stress ◽  
Stress Group ◽  
Stressed Group ◽  
High Incidence

Four groups of 80 eggs each were subjected to a low temperature stress of 3.8 C for 0, 4, 5, or 8 h, respectively, commencing after 17 days (408 h) incubation. Samples of these eggs were examined at 18.0, 19.5, 20.5, and 21.5 days incubation to study the treatment effect on embryonic development, and the remainder of the eggs were incubated for 22 days to determine the effect on hatchability. Hatchability was significantly reduced by 5 and 8 h of exposure to 3.8 C whereas 4 h of exposure caused a nonsignificant reduction in hatchability. Examination of embryos that failed to hatch revealed a high incidence of malpositions and abnormal hatching muscles. Malpositions occurred as early as 18 days incubation whereas edema, or hemorrhage, or both, of the hatching muscle did not begin to develop until 19.5 days. By 20.5 days of age the hatching muscles of the 8-h stressed group were significantly heavier than all other groups. The weight of the hatching muscle from the 5- and 8-h exposure groups increased continually during incubation whereas those of the controls and 4-h stress group had begun to decrease by 20.5 days and 21.5 days, respectively.

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