Fall harvest management for irrigated alfalfa in southern Saskatchewan

1992 ◽  
Vol 72 (4) ◽  
pp. 1183-1191
Author(s):  
P. G. Jefferson ◽  
B. D. Gossen
Keyword(s):  
Low Temperature ◽  
Stand Density ◽  
Shoot Density ◽  
Temperature Tolerance ◽  
Forage Yield ◽  
Harvest Date ◽  
Yield Reduction ◽  
Harvest Management ◽  
Low Temperature Tolerance ◽  
Harvest Dates

Three trials were conducted under irrigation at Swift Current, Saskatchewan to examine the interaction of fall harvest date and alfalfa cultivar. The treatments were five fall harvest dates, 15 Aug., 1 Sept., 15 Sept., 30 Sept. (two harvests per season) and 15 Aug. + 15 Oct. (three harvests per season), on three or four alfalfa cultivars. Trials were seeded on irrigated alluvial clay loam soil in 1979, 1981 and 1987. Low-temperature injury occurred in 1982, 1985, and 1989 in these three experiments, respectively. In Trial I, the effect of fall harvest date on stand and yield loss was greatest for the least winterhardy cultivar, Anchor, and least for the most winterhardy cultivar, Rambler. Forage yield recovered the year after injury, in spite of an apparent permanent reduction in stand density. In Trial II, low temperature injury was extensive in all treatments and the cultivar × date interaction was not significant. In Trial III, Anchor alfalfa harvested on 15 Oct. exhibited the lowest percent survival and shoot density. Heinrichs and Rambler were less affected by winterkill at all dates than Anchor but did exhibit severe yield reduction when harvested three times per season compared to two times. Anchor exhibited greater stand loss and lower first harvest forage yield in 1989 for both treatments that were cut on Oct. 15. There was no significant fall harvest date effect among the four two-harvest regimes in this trial. The observed date effect was due to the three-harvest regime compared to the rest. A fourth experiment was located at Outlook, Saskatchewan, where alfalfa, cv. Beaver, was harvested on 19 Sept., 24 Sept., 2 Oct. and 10 Oct. in 1989. Low-temperature injury was evident in 1990. First harvest forage yield in 1990 was significantly reduced for the third harvest dates compared to two harvests per season. These results do not provide categorical evidence of a "critical fall harvest period" for these two sites. The low-temperature tolerance of the cultivar determines to a large extent its sensitivity to fall harvest management.Key words: Medicago sativa L., winter survival, autumn management

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.

scholarly journals QTL Mapping Low-Temperature Germination Ability in the Maize IBM Syn10 DH Population

Plants ◽  
2022 ◽  
Vol 11 (2) ◽  
pp. 214
Author(s):  
Qinghui Han ◽  
Qingxiang Zhu ◽  
Yao Shen ◽  
Michael Lee ◽  
Thomas Lübberstedt ◽  
...  
Keyword(s):  
Transcription Factor ◽  
Low Temperature ◽  
Candidate Genes ◽  
Temperature Tolerance ◽  
Bhlh Transcription Factor ◽  
Rna Seq ◽  
Dh Population ◽  
Low Temperature Tolerance ◽  
Germination Ability ◽  
Upregulated Genes

Chilling injury poses a serious threat to seed emergence of spring-sowing maize in China, which has become one of the main climatic limiting factors affecting maize production in China. It is of great significance to mine the key genes controlling low-temperature tolerance during seed germination and study their functions for breeding new maize varieties with strong low-temperature tolerance during germination. In this study, 176 lines of the intermated B73 × Mo17 (IBM) Syn10 doubled haploid (DH) population, which comprised 6618 bin markers, were used for QTL analysis of low-temperature germination ability. The results showed significant differences in germination related traits under optimum-temperature condition (25 °C) and low-temperature condition (10 °C) between two parental lines. In total, 13 QTLs were detected on all chromosomes, except for chromosome 5, 7, 10. Among them, seven QTLs formed five QTL clusters on chromosomes 1, 2, 3, 4, and 9 under the low-temperature condition, which suggested that there may be some genes regulating multiple germination traits at the same time. A total of 39 candidate genes were extracted from five QTL clusters based on the maize GDB under the low-temperature condition. To further screen candidate genes controlling low-temperature germination, RNA-Seq, in which RNA was extracted from the germination seeds of B73 and Mo17 at 10 °C, was conducted, and three B73 upregulated genes and five Mo17 upregulated genes were found by combined analysis of RNA-Seq and QTL located genes. Additionally, the variations of Zm00001d027976 (GLABRA2), Zm00001d007311 (bHLH transcription factor), and Zm00001d053703 (bZIP transcription factor) were found by comparison of amino sequence between B73 and Mo17. This study will provide a theoretical basis for marker-assisted breeding and lay a foundation for further revealing molecular mechanism of low-temperature germination tolerance in maize.

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