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141.
142.
不同胁迫条件对青菜生理生化指标的影响 总被引:1,自引:0,他引:1
对苏州青、阳都青菜2个品种的幼苗分别进行低温弱光(4~8℃;500 lx)双重胁迫和低温弱光盐(200 mmol/L的NaCl溶液)三重胁迫处理。结果表明:随着胁迫时间的增长,植株体内超氧化物歧化酶(SOD)总活性、叶绿素(CHL)的含量均呈下降趋势,丙二醛(MDA)和可溶性糖的含量均呈上升趋势,且不同品种的青菜幼苗的各项生理生化指标的变化及程度不同,分别表现出不同的耐低温弱光和对低温弱光盐胁迫的抗性。 相似文献
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Raico E Laria Lamela Yanis Cruz Quintana Raquel Silveira Coffigny Mercedes Martínez Norma González Herrate 《Aquaculture Research》2008,39(12):1316-1321
Formalin is used in shrimp industry to eliminate ectoparasites and as a disinfectant. However, the effect of formalin on shrimp's defense mechanism is unknown. Several biomarkers were used to assess the immune response of juveniles of the shrimp Litopenaeus schmitti exposed to different concentrations of formalin (10, 25 and 50 mg L?1) during 24 and 48 h. Formalin concentrations of 25 and 50 mg L?1 produced a significant reduction in the total haemocyte count at both 24 and 48 h. Peroxidase and phenoloxidase activity did not show variations. The total protein concentration in haemolymph of shrimps was not significantly different between experimental groups. Histological analysis showed hyperplasia in the gills of animals exposed at 10 mg L?1 for 24 h; however, the exposure at 25 and 50 mg L?1 caused necrosis in gills, hepathopancreas and the antennal gland. 相似文献
146.
Saeedeh Rafatnezhad Bahram Falahatkar Mohammad H Tolouei Gilani 《Aquaculture Research》2008,39(14):1506-1513
The influence of stocking density (1, 2, 4, 6 and 8 kg m?2) was investigated on haematological parameters, growth and fin erosion of great sturgeon (Huso huso) juveniles for a period of 8 weeks. The mean weight of fish at the start of trial was 93.13±1.04 g. After 8 weeks of rearing, the mean weight was 362.4, 319.7, 267, 242.1 and 211.1 in densities 1–8 kg m?2 respectively. The results of this study showed that growth parameters, including condition factor, weight, weight gain, feed conversion ratio, specific growth rate and body weight increase, had a statistically significant difference among treatments (P<0.05). A significant difference (P<0.05) was observed in haematocrit, but the other haematological parameters, including red blood cells, white blood cells (WBC), haemoglobin concentration, mean corpuscular haemoglobin, mean corpuscular volume, mean corpuscular haemoglobin concentration and differential WBC count, showed no significant effect with stocking density (P>0.05). At the end of the experiment, stocking density had no significant effect on plasma cortisol and glucose concentration. The fin length (dorsal, anal, ventral, pectoral and caudal) of fish was measured to calculate the fin index. According to this index, dorsal, anal, ventral and pectoral fins showed no significant difference among treatments (P>0.05), but the erosion of the caudal fin was significantly different between fish held on 6 and 8 kg m?2 (P<0.05). These results showed that rearing density has a major effect on the growth indices of H. huso. Unlike many other fish, great sturgeon exhibited lower stress responses to high stocking density. This indicates that they are more tolerable to rearing conditions in high stocking densities. With respect to the various effects that density causes on growth, fin erosion and physiological and haematological parameters, better understanding of these phenomena considering different levels of density could have a beneficial impact on many rearing steps of this species. 相似文献
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Differential HSP90α expression in fish hepatocytes from polluted estuary during summer 总被引:2,自引:0,他引:2
The molecular chaperone, heat shock protein 90α (HSP90α), plays an important role in protein folding, degradation of denatured
proteins and steroid activation. It is essential for the maintenance of cellular integrity and survival when induced in response
to environmental, physical and chemical stresses. In the present investigation the effect of environmental stress on HSP90α
expression was examined in grey mullet Mugil cephalus living in either a contaminated (Ennore) or uncontaminated (Kovalam) estuary over two seasons: Hepatocytes were isolated
from grey mullet of both estuaries. Oxidative stress was determined along with HSP90α in these fish. Additionally, immunohistochemical
changes were studied to confirm the HSP90α expression. Comparison of the results revealed enhanced hepatocyte oxidative stress
and HSP90α expressions in fish from Ennore to a significant extent than fish from Kovalam. Also, the results showed significant
seasonal variations with maximum expression observed during summer compared to the monsoon season. Overexpression of HSP90α
in hepatocytes exposed to chronic environmental stress by pollutants may confer differential effects on cell survival by protecting
against oxidative stress induced changes. The results also indicate that seasonal variations have significant effect on the
HSP90α expression. 相似文献
150.
干旱胁迫对枣树叶片生理的影响 总被引:2,自引:0,他引:2
以盆栽2年生蒙山脆枣和沾化冬枣为试材,研究了不同干旱胁迫程度对叶片水分饱和亏、叶片保水力、游离脯氨酸含量、SOD活性、POD活性、甜菜碱含量等生理指标的影响。结果表明:尽管品种间的变化存在差异,但随着干旱胁迫程度的加重,两品种的叶片保水力呈下降趋势,水分饱和亏、Pro含量、甜菜碱含量呈增加趋势,SOD、POD活性呈先升高后下降趋势;高含量的甜菜碱有利于枣叶片保持较高的水分含量,甜菜碱、Pro含量与枣品种的抗旱性存在一定的正相关关系,可以作为枣品种抗旱性鉴定的指标。 相似文献