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为研究在培养料中施加外源硒肥对毛木耳子实体的富硒能力、产量、菌丝长势和子实体经济性状的影响,通过添加硒肥使培养料中硒的含量分别为0、30、60、90和120μg·g-1,进行毛木耳栽培试验。结果显示,使用30、60和90μg·g-1含硒培养料时,毛木耳产量较对照组分别增产2.25%、5.68%和8.72%;毛木耳硒含量分别为2.29、4.40和8.33 mg·kg-1。使用120μg·g-1含硒培养料时产量减少3.16%;毛木耳硒含量为8.86 mg·kg-1。表明添加适宜的硒肥可以促进毛木耳菌丝生长,缩短菌丝满袋时间,并增加产量;而添加过量硒肥则会抑制其菌丝生长,延长菌丝满袋时间,并减少产量。综合考虑产量及国家富硒食用菌标准,推荐毛木耳栽培中添加硒肥的培养料中最佳硒含量为60μg·g-1。 相似文献
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杏鲍菇菌渣栽培白背毛木耳对产量和品质的影响 总被引：2，自引：0，他引：2
以白背毛木耳"漳耳43-28"为研究对象,对比分析了在常规栽培料中添加30%杏鲍菇菌渣栽培白背毛木耳与对照处理的产量、经济效益、蛋白质、多糖、脂肪、粗纤维、灰分、氨基酸等各项指标,探讨了常规栽培料中添加杏鲍菇菌渣对白背毛木耳生产效益和营养成分的影响。结果表明:在常规栽培料中添加杏鲍菇菌渣栽培白背毛木耳,可以提高木耳产量,平均增产22.92%,相对净收益增加54.21%;同时还可以增加其子实体中的粗蛋白、多糖、氨基酸含量,并可降低其中的粗脂肪和粗纤维含量,改善食用口感,提高其药用价值和食用价值。 相似文献
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沙子、炉渣、菇渣不同配比对茄子产量和品质的影响 总被引：1，自引：0，他引：1
以沙子∶炉渣=2 V∶1 V为对照,在此基础上分别添加10%(T1)、20%(T2)、30%(T3)、40%(T4)和50%(T5)体积比的菇渣,研究沙子、炉渣、菇渣复合基质对茄子产量和品质的影响。结果表明:冬春茬试验中,T3处理的果肉可溶性糖和游离氨基酸含量均显著高于对照;T4处理的果肉抗坏血酸含量显著高于对照,茄皮花青素、类黄酮和总酚含量也较高。秋冬茬试验中,T3处理的果肉可溶性糖、可溶性蛋白和游离氨基酸含量均显著高于对照,T4处理的抗坏血酸含量显著提高,T1处理的茄皮类黄酮和总酚含量显著提高。两茬试验中,T1处理的产量均为最高,分别比对照增产5.5%和11.2%。综上,冬春茬和秋冬茬均以添加10%比例的菇渣最有利于茄子产量形成,而添加30%或40%比例的菇渣有利于茄子果实品质形成。 相似文献
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番茄栽培基质中菊芋发酵秸秆的适宜配比研究 总被引：2，自引：0，他引：2
为研究菊芋发酵秸秆作为无土栽培基质的可行性,并筛选适宜的复配基质配比,开展了番茄基质栽培中适宜配比的研究。选取草炭与蛭石体积比2︰1的基质为对照,设置发酵后菊芋秸秆的添加比例为10%、20%、30%、40%、50%等复合基质处理,测定复配基质的理化性状,研究其对番茄生长、品质、产量、抗病性等的影响。结果表明,复合基质容重、总孔隙度、持水孔隙随菊芋发酵秸秆添加量的增多而降低,持水能力、通气孔隙、大小孔隙比随着菊芋发酵秸秆添加量的增多而增大;菊芋发酵秸秆添加量30%处理的番茄株高比对照增加8.22%;随着菊芋发酵秸秆添加量的增大番茄叶片Pn呈先上升后下降的趋势,菊芋发酵秸秆添加量10%、20%、30%和40%处理比对照处理高21.53%、17.72%、14.77%和14.20%。对照处理番茄病情指数(70.00)高于其他处理(35.72~51.98)。番茄果实可溶性固形物、维生素C、可溶性糖含量和糖酸比均随菊芋发酵秸秆添加量的增大而呈现先上升后下降的趋势,菊芋发酵秸秆添加量20%~30%处理维生素C、可溶性糖含量和糖酸比显著高于对照;可滴定酸以对照最高,糖酸比以30%处理最高,显著高于对照处理110.39%。各处理单株总产量,菊芋发酵秸秆添加量20%和10%的处理,分别显著高于对照14.50%和12.50%。试验表明,适宜番茄基质栽培菊芋发酵秸秆的添加量为20%~30%。 相似文献
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不同形态镁对‘早熟5号’大白菜产量及品质的影响 总被引：2，自引：0，他引：2
采用盆栽试验,研究复混肥中添加不同形态镁对大白菜产量及品质的影响。复混肥中分别添加硫酸镁(MgSO4)、氨基酸螯合镁(Mg-AA)和EDTA螯合镁(Mg-EDTA),设4个施镁水平,即1、3、5和7mg·kg-1。结果表明,与不施镁对照相比,添加Mg-EDTA对提高大白菜的产量效果最佳,施镁7mg·kg-1水平时,增产46.6%;添加Mg-AA对提高大白菜的品质最佳,4个施镁水平均可有效提高大白菜叶绿素、可溶性糖、可溶性蛋白质及维生素C的含量;添加MgSO4的处理,施镁5mg·kg-1最好,产量比对照增加34.5%,各项品质指标高于对照。 相似文献
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以3种不同浓度的除虫脲为试材,采用菌丝生长抑制率法、菌丝干质量法,研究白背毛木耳菌丝对除虫脲的敏感性,同时以拌料方式施药于白背毛木耳栽培料,研究除虫脲防治白背毛木耳真菌瘿蚊的效果,并检测试验处理的农残情况,以期为除虫脲防治毛木耳真菌瘿蚊技术提供参考依据.结果 表明:供试的除虫脲浓度对白背毛木耳菌丝生长速度抑制作用小,均低于10％.而2500倍除虫脲T1处理对白背毛木耳菌丝体生长量有一定的抑制作用.供试的除虫脲浓度对产量无明显不利影响,由于污染菌包数量减少,单包平均产量均提高.2500倍除虫脲T1处理,菌株1261、B2872平均单袋产量分别比对照提高21.81％、31.91％,差异均达极显著水平.2500倍除虫脲T1处理,菌株1261的真菌瘿蚊发生率仅3.06％,比对照(20.56％)降低85.12％.菌株B2872发生率为9.72％,比对照(20.56％)降低64.65％.各试验处理子实体均未有农残危害.2020-2021年示范2500倍除虫脲拌入发酵料中防治毛木耳真菌瘿蚊,示范2万袋,虫害降低83.3％,示范效果好. 相似文献
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AIM: To examine the autoantibody against α1-adrenoceptor and its biologic activities during the development of renal hypertension. METHODS: Renal hypertension of rat was achieved by clipped renal artery, the titre of autoantibody to α1-adrenoceptor was detected using ELISA immunoassay. Furthermore, the biological offects of these autoantibodies on cultured cardiomyocytes were also examined. RESULTS: After two weeks of clipping renal arteries, both the frequency of occurrence and the titre of autoantibodies to cardiac α1-adrenergic receptor were significantly increased as compared with the control of pre-treatment. The increased autoantibodies lasted for several weeks and then automatically decreased gradually to the pre-clipping level at 12 weeks. The biological effects of these autoantibodies displayed an "agonistic-like" activities on the beating frequency of cultured neonatal cardiomyocytes. CONCLUSION: Autoantibodies against α1-adrenoceptor may play a role in the elevation of peripheral vascular resistance and in the development of cardiac hypertrophy in rats with renal hypertension. 相似文献
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AIM: Although endovascular radiotherapy inhibits neointimal hyperplasia, the exact alterations induced by β-particles irradiation remain to be elucidated. The objective of this study was to investigate the ability and the cellular mechanism of local β-particles emission from 188Re to inhibit vascular smooth muscle cells (SMCs). METHODS: The SMCs in vitro were irradiated by 188Re with single doses of 2.6 Gy-25.8 Gy. The effects of β-particles on SMCs, such as effective irradiate doses, the period of inhibition for SMCs proliferation, the changes of cell proliferation rate and DNA synthesis rate, cell cycle progression and related gene expression, were investigated by cell count, [3H]-TdR incorporation, cell cycle progression analysis, cell viability and immunocytochemistry, respectivecy. RESULTS: β-particles irradiation with dose of 5.2 Gy could inhibit significantly SMCs proliferation. At dose of 20.6 Gy DNA synthesis inhibitory rate was 92%, SMCs proliferation rate was only 3%. Renoval of 188Re did not abolish the inhibitory effects of β-particles on SMCs proliferation. The expression of P53 was up regulation and PCNA was down regulation after irradiation. CONCLUSION: β-particles from 188 Re was significantly effective and permanent in inhibiting SMCs proliferation, and inhibitory effect was in dose-dependet manner ED50was 5 Gy, the best dose to inhibit SMCs proliferation was 20 Gy. β-particles irradiation induced SMCs to occur G0/G1 arrest, damaged the ability of SMCs reproliferation and led to cell clonogenic death. P53 and PCNA had regulatiory effects on SMCs proliferation after β-particles irradiation. 相似文献
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《International Journal of Fruit Science》2013,13(1):139-156
Abstract This review is based partly on complete articles and partly on abstracts. Three of the 60 articles deal with the total uptake of elements in strawberry plant organs in two different strawberry production systems, both considered as optimal concerning amount and balance of elements. The effect on fruit quality may be dramatic if the level of a particular element is outside this range, but there may also be effects initiated by differences within the optimal range of elements. Most articles refer to product oriented quality, but some focus on consumer oriented quality, as discussed by Shewfelt (1999). The discussion here is on a general basis, so one should keep in mind that there are cultivar differences and that specification of nutrition ideally should mirror the needs of a single cultivar, or a group of cultivars with similar requirements. Also, to get a complete understanding of the subject future reviews should embrace a broader access of information including the effect on plant development of individual elements, such as the role of calcium in fruit firmness and its importance in cell wall structure. However, the intention here is to narrow the information to results that suggest a direct connection between nutrient uptake and fruit quality. 相似文献
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AIM:To study the effect of L-Arg on plasma content of endothelin (ET) and the expression of proto-oncogene c-fos mRNA in the left ventricle of rats with renovascular hypertensive hypertrophy. METHODS: The level of c-fos mRNA were measured by in situ hybridization. The ET in plasma were measured by radioimmunoassay. RESULTS:After eight weeks of treatment with L-Arg, the expression of c-fos decreased markedly (P＜0.01). The ET content in plasma also decreased significantly by L-Arg(P＜0.01).CONCLUSION: Plasma ET content and the expression of c-fos in the left ventricle of rats with renovascular hypertensive hypertrophy could be decreased by L-Arg administration. 相似文献
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Fulé Peter Z. Crouse Joseph E. Heinlein Thomas A. Moore Margaret M. Covington W. Wallace Verkamp Greg 《Landscape Ecology》2003,18(5):465-486
Fire regime characteristics of high-elevation forests on the North Rim of the Grand Canyon, Arizona, were reconstructed from fire scar analysis, remote sensing, tree age, and forest structure measurements, a first attempt at detailed reconstruction of the transition from surface to stand-replacing fire patterns in the Southwest. Tree densities and fire-/non-fire-initiated groups were highly mixed over the landscape, so distinct fire-created stands could not be delineated from satellite imagery or the oldest available aerial photos. Surface fires were common from 1700 to 1879 in the 4,400 ha site, especially on S and W aspects. Fire dates frequently coincided with fire dates measured at study sites at lower elevation, suggesting that pre-1880 fire sizes may have been very large. Large fires, those scarring 25% or more of the sample trees, were relatively infrequent, averaging 31 years between burns. Four of the five major regional fire years occurred in the 1700s, followed by a 94-year gap until 1879. Fires typically occurred in significantly dry years (Palmer Drought Stress Index), with severe drought in major regional fire years. Currently the forest is predominantly spruce-fir, mixed conifer, and aspen. In contrast, dendroecological reconstruction of past forest structure showed that the forest in 1880 was very open, corresponding closely with historical (1910) accounts of severe fires leaving partially denuded landscapes. Age structure and species composition were used to classify sampling points into fire-initiated and non-fire-initiated groups. Tree groups on nearly 60% of the plots were fire-initiated; the oldest such groups appeared to have originated after severe fires in 1782 or 1785. In 1880, all fire-initiated groups were less than 100 years old and nearly 25% of the groups were less than 20 years old. Non-fire-initiated groups were significantly older (oldest 262 years in 1880), dominated by ponderosa pine, Douglas-fir, or white fir, and occurred preferentially on S and W slopes. The mixed-severity fire regime, transitioning from lower-elevation surface fires to mixed surface and stand-replacing fire at higher elevations, appeared not to have been stable over the temporal and spatial scales of this study. Information about historical fire regime and forest structure is valuable for managers but the information is probably less specific and stable for high-elevation forests than for low-elevation ponderosa pine forests.This revised version was published online in May 2005 with corrections to the Cover Date. 相似文献
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《International Journal of Fruit Science》2013,13(3):101-120
Abstract Saskatoon berry (Amelanchier alnifolia Nutt., Rosaceae) and blueberry (Vaccinium corymbosum L., Ericaceae) are substantially equivalent in all characteristics that are important to the consumer, including fruit color, shape, size, nutrition, texture, and uses. In addition, both fruits are native to North America and they have practically identical historical uses and known health benefits. Their composition, processing, nutritional value and metabolism, intended uses, and levels of undesirable substances are compared. 相似文献
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The objective of this study was to establish a cryopreservation protocol for hawthorn shoot apices (Crataegus pinnatifida Bge.). Cryopreservation was carried out via encapsulation–dehydration, vitrification, and encapsulation–vitrification on shoot apices excised from in vitro cultures. We began by showing that cold-acclimation enhanced the regrowth of cryopreserved apices from 10.0 to 65.5% in encapsulation–dehydration. We then decided that the encapsulation–dehydration method was an optimal cryopreservation method for hawthorn shoot apices in terms of its high recovery after cryopreservation as well as its ease of use compared with vitrification and encapsulation–vitrification. In encapsulation–dehydration, the protocol leading to optimal regrowth was as follows: after cold-acclimation at 5 °C in the dark for 2 weeks, excised shoot tips were pretreated for 24 h at 25 °C on hormone-free Murashige and Skoog [Murashige, T., Skoog, F., 1962. A revised medium for rapid growth and bioassays with tobacco tissue culture. Physiol. Plant. 15, 473–497] (MS) basal medium with 0.4 mol/L sucrose, then encapsulated and precultured in liquid MS medium with 0.8 mol/L sucrose for 16 h at 25 °C. Precultured beads were dehydrated for 6 h at 25 °C in the dessicator containing 50 g silica gel to a moisture content of 15.3% (fresh-weight basis) before cryostorage for 1 h. In addition, we examined the effect of adding glycerol to both the alginate beads and loading solution to enhance regrowth after cryopreservation in encapsulation–dehydration. In the present study, it was shown that adding 0.5 mol/L glycerol resulted in high regrowth percentages (82.5–90.0%) in four Crataegus species. 相似文献
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以西双版纳黄瓜和‘华黄5号’黄瓜叶片为试验材料,研究了衰老过程中两种黄瓜叶片叶绿素含量变化及脱镁叶绿素脱镁叶绿酸水解酶基因PPH和脱镁叶绿酸a加氧酶基因PAO的表达。结果表明：随着叶片衰老,叶绿素a和叶绿素b含量显著降低,叶绿素a与叶绿素b的比值在0.5左右,推测叶绿素b的含量可能对黄瓜叶片保绿起到重要作用。荧光定量RT-PCR分析结果显示：PPH和PAO在西双版纳黄瓜叶片生长35 d时表达量最高,分别为5.50和1.86;PPH在‘华黄5号’叶片35 d时表达量最高,为7.14,而PAO在35和45 d表达量都很高,分别为3.90和3.91;PPH和PAO在西双版纳黄瓜叶片中的表达量低于在‘华黄5号’中。 相似文献
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AIM:To observe the effect of simvastatin on the proliferation of vascular smooth muscle cells(VSMCs) induced by serum and growth factor PDGF-BB and the effect of simvastatin on the expression of PTEN,a important regulator of G1/S cell cycle transition. METHODS:The DNA synthesis was determined by [3H]-TdR incorporation, cell cycle was examined with flow cytometry, the protein level of PTEN was measured by Western blot method. RESULTS: (1)Simvastatin inhibited [3H]-TdR incorporation in a dose dependent manner. (2) Flow cytometric DNA analysis revealed that simvastatin induced significantly enhancement of G0/G1 phase and decrease in S phase VSMCs.(3)Simvastatin increased protein level of PTEN and mevalonate, a metabolite of HMG-COA, reversed the effect of simvastatin on PTEN protein expression. CONCLUSION:Simvastatin may inhibit proliferation of VSMCs and retarded cell cycle in G0/G1 phase by increasing PTEN expression through inhibiting synthesis of mevalonate. 相似文献
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A two-year field study investigated the possible effects of grain sorghum (Sorghum bicolor [L.] Moench) and uncultivated areas on the abundance of generalist predators in commercially-managed cotton (Gossypium hirsutum L.) fields in Texas, USA. From 63 to 70 fields were sampled for pests and predators over nine consecutive weeks during early stages of cotton development. Additional data on agronomic practices and landscape composition at three spatial scales were also collected for each field. Stepwise regression analyses were used to determine the relationships of landscape, agronomic and prey variables to the abundance of generalist predators. Because the variables most closely linked to predator levels could vary over time, separate regressions were conducted for three time periods corresponding to stages of grain sorghum growth (half-bloom, hard-dough, maturity) in each year. Significant relationships between predator abundance and agricultural landscape composition appear in both years and in all three time periods, but the specific relationships of landscape variables to cotton predator levels differed between and within years. At maturity in 2001, predator levels rose as the amount of uncultivated land from 1.6 to 3.2 km distant and the perimeter shared with grain sorghum increased. During 2002, the area of grain sorghum (half-bloom) and uncultivated land (hard-dough) within 1.6 km of cotton fields were both positively related to predator numbers. Cotton planting dates and the abundance of cotton fleahoppers (Pseudatomoscelis seriatus [Reuter]) were also strongly linked to predator numbers during both years. Results suggest that the total amount of grain sorghum or uncultivated land in an area is more important than the presence of these habitats adjacent to cotton fields, and that landscape composition may sometimes be the most important factor in determining predator abundance. 相似文献