The QTLs related to cold tolerance at the booting stage were detected on chromosome 1, 2, 4, 11 and 12, respectively, which explained 5.6%-8.2% of the observed phenotypic variance.
The QTLs related to relative cold tolerance at the booting stage were detected on chromosome 1, 3, 4 and 11, respectively, which explained 5.9%-10.3% of the observed phenotypic variance.
Three QTL on chromosomes 1, 5 and 9, which associated with cold tolerance at the seedling stage were detected, among them, qCTS1 accounted 15.5% of observed phenotypic variation;
Under cold damage circumstances in Kunming,the cold tolerance at the booting stage of BC_5F_1,BC_5F_2,BC_5F_3 and BC_5F_4 generation of hybrids from near-isogenic line(BC_4F_5) of parents Lijing2(japonica rice) and Towada(indica rice) was analyzed by using major gene-poly-gene mixed inheritance models.
Treatments of NP as seed manure and soaking maize seeds with Zn++ (0.1%) , BR (Brassinolide) (1, 0.1, 0.001Ppm) before sowing could increase cold tolerance of the plant.
300 μmol·L-1 of SA could increase the heat tolerance of maize seedlings under 46℃ for 2 d and 150 μmol·L-1 of SA could enhance the chilling tolerance under 1℃ for 5 d.
The H 2 O 2 induced chilling tolerance was eliminated by blocking the mobilization of intracellular Ca 2+ pool flux (ruthenium red treatment), decrease of cell Ca 2+ level (EGTA treatment) and inhibition of CaM activity (TFP and CPZ treatments) in maize seedlings.
These results suggest that CaM and the mobilization of intracellular Ca 2+ pool play an important role in formation of the H 2 O 2 induced chilling tolerance in maize seedlings, and high Ca 2+ level in apoplast and the influx of extracellular Ca 2+ into cells across plasma membrane will weaken the H 2 O 2 induced chilling tolerance.
The same result was found in F2, F3 hybrids, The hybrids from the parents with high. tolerance to cold, such as Hefu 84-480×Ha 83-3331 showed the best resistance to cold during germination.
in the years 1987-1990, 60 soybean germplasms from northeast part of China and hybrids in F2 and F3 from 6 parents with different tolerance to cold were identified for the resistance to cold during the germination.
The results showed that the tolerance to cold in germination varied signficantly in soybean germplasms. Among them, Ha83-3331, Hejiao 83-1698, Hefeng 27, Hefu 84-480, Shui 82-203, Neidou 1 were identitied to have high tolerance to cold.
The dominant-recessive relationship of the cold-tolerance genes in the cultivars Kunming Xiaobaigu, Lijing No. 2 and Banjiamang and the number of the gene pairs involved were deduced and the genetic effects were found to be significantly different.
The fatty acid composition of mitochondrial membrane lipids from seedlings of two grass species differing in their chilling tolerance, elymus (Elymus sibiricus) and maize (Zea mays), was studied by gas-liquid chromatography.
However, pharmacological induction of thermoregulatory tolerance to cold without excessive sedation, respiratory depression, or other serious toxicity remains a major focus of current therapeutic hypothermia research.
The effects of depletion of the serotonin precursor,l-tryptophan, on the threshold and tolerance to cold pressor pain, and the analgesic effect of morphine (10 mg intramuscularly), were tested in a double blind trial on human volunteers.
We considered that there were four stages in the formation of growth-arrested stages: induction, growth-arrested pathway, growth-arrested development and cold-tolerance duration.
It is concluded that the seasonal changes in cold-tolerance of adult barnacles are probably induced by a combination of environmental factors including food availability, light intensity, day-length and changes in ambient sea-water temperatures.