共查询到20条相似文献，搜索用时 78 毫秒
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以荧光灯为对照,研究了相同光照强度（150μmol·m-2·s-1）下,不同红蓝LED组合光源（R/B=7∶1、R/B=7∶2、R/B=7∶3）对葫芦和南瓜幼苗生长和生理参数的影响。研究结果表明,葫芦幼苗在LED组合光源R/B=7∶1、R/B=7∶3下,壮苗指数显著高于对照;南瓜幼苗在LED组合光源R/B=7∶2、R/B=7∶3下,壮苗指数显著高于对照;另外,在LED组合光源R/B=7∶3下,葫芦、南瓜幼苗的叶绿素含量、可溶性糖含量均显著高于对照。综上可知,LED组合光源R/B=7∶3最适合培育南瓜和葫芦幼苗。 相似文献
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以"百蜜5号"南瓜种子为试材,在一定红蓝光配比下(R∶ B=9∶ 1),设置6种不同光照强度(80、120、160、200、240、280 W·m-2),以普通日光灯为对照(CK),研究不同光照强度下LED红蓝光对南瓜幼苗生长及田间性状的影响,以期为培育南瓜壮苗寻找最适光源和培养高品质南瓜幼苗提供参考依据.结果表明:在光照强度为280 W·m-2时,南瓜幼苗的可溶性糖、可溶性蛋白质、净光合速率(Pn)、茎长达到最大值;在光照强度为160 W·m-2时,根系活力、茎粗、地上和地下鲜质量以及地上干质量为最大值;在光照强度为120 W·m-2时,气孔导度(Gs)、根长、壮苗指数为最大值;在光照强度为200 W·m-2时,丙二醛(MDA)含量达到最低值,在光照强度为240 W·m-2时,真叶数、地下干质量、根冠比达到最大值.综上可知,在南瓜幼苗的生根阶段选用120～160 W·m-2的光照强度适合根系和幼苗的生长;选用200～280 W·m-2有利于南瓜幼苗的其它阶段的生长发育. 相似文献
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随着我国设施蔬菜种植面积和蔬菜育苗产业的不断扩大,蔬菜商品苗的贮藏和运输成为育苗产业的重要环节。以辣椒品种农大24为试材,研究穴盘成苗在不同低温弱光环境下的形态指标与生理指标变化,旨在明确适合辣椒种苗长期贮藏或长途运输的适宜环境条件。结果表明:温度为11℃,R∶B为1.9的荧光灯且光照强度为30μmol·m~(-2)·s~(-1)、光照周期为12h·d~(-1)的贮藏环境和R∶B为1.3的LED且光照强度为15μmol·m~(-2)·s~(-1)、光照周期为24h·d~(-1)的贮藏环境均能满足14d辣椒种苗贮藏和运输,有效地维持了种苗质量。相比于荧光灯,高光效和低能耗的LED光源更适用于辣椒种苗的低温弱光贮藏和长途运输。 相似文献
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以‘蓝鼠耳’玉簪为试材,利用LED光源,研究了不同光质和光强对试管苗生长及生根的影响,以期为‘蓝鼠耳’玉簪试管苗的工厂化生产提供参考依据。结果表明：1)LED光质为W∶R=7∶1时,试管苗的增殖系数为4.71,是所有处理中的最大值;株高和叶面积综合表现良好,分别为17.48 mm和30.90 mm2,说明W∶R=7∶1时对试管苗的生长有较好的促进作用。试管苗的生根率在R∶B=5∶1、W∶R=7∶1、R∶W=2∶3时均高于97%,优于其它处理。LED光质为R∶W=2∶3时试管苗的根数为17.54条,说明光质R∶W=2∶3时能够有效促进试管苗根系生长。2)低光强59μmol·m-2·s-1时有利于试管苗增殖,随着光照强度的增加,增殖系数呈下降趋势。当光强为176～235μmol·m-2·s-1时,试管苗的叶面积表现良好,为73.09 mm2,说明该光强对试管苗的生长有较好的促进作用。当光照强度为118～176μmol·m-2·s... 相似文献
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以黄瓜为试材,采用发光二极管(LED)作为光源,在不同温度下以普通荧光灯为对照,研究纯红光(R)、纯蓝光(B)、红蓝混合光(R/B=5∶5、6∶4、7∶3)对黄瓜幼苗生长的影响。结果表明:单一色光处理下黄瓜幼苗生长不良;综合各性状表现,在光强270μmol·m~(-2)·s~(-1)、14h·d~(-1)光周期条件下,当温度控制在8h·d~(-1) 30℃、16h·d~(-1) 23℃时,红蓝光混合配比7∶3处理有利于黄瓜幼苗生长;当温度控制8h·d~(-1) 32℃、16h·d~(-1) 26℃条件下,红蓝光混合配比6∶4的处理有利于黄瓜幼苗生长。 相似文献
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红蓝绿LED 延时补光对日光温室番茄育苗的影响 总被引：1，自引：0，他引：1
以番茄品种辽园多丽为试材,选择白光（W）及红光（R）、蓝光（B）、绿光（G）3 种LED 光源组成6 种不同比例组合光R9B1（9∶1,灯的数量比,下同）、R8B2、R7B3、R9G1、R8B1G1、R7B2G1,研究不同LED 光源延时补光对冬春季日光温室番茄幼苗生长的影响。结果表明：补照LED 光源不同程度地促进了番茄幼苗的生长,其中R7B2G1 的效果最为显著,与不补光对照相比,茎粗增加27.42%,全株鲜质量和干质量分别提高17.84%、30.91%,壮苗指数提高57.61%;幼苗根系活力、叶绿素含量与净光合速率、叶片可溶性糖含量等也显著提高。综上,在红蓝光源的基础上增加一定比例的绿光,能显著促进番茄幼苗生长。 相似文献
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以番茄品种"金鹏1号"为试材,设3个水平红蓝光质配比R/B=7∶1、R/B=3∶1、R/B=1∶1,2种营养液分别为山崎番茄配方和霍格兰番茄配方,以气候箱处理为对照。用波长为660nm红色LED光源和450nm蓝色LED光源,研究不同红蓝光质配比和营养液耦合下番茄生长的差异,探索人工可控条件下适宜番茄生长的光质配比和营养液组合。结果表明:霍格兰营养液各处理随红光比例增加,株高、茎粗、干鲜重有增大的趋势;气候箱对照各光合色素含量较高;红蓝光处理可以显著增大潜在光化学活性(Fv/Fo)和最大光能转化效率(Fv/Fm);霍格兰营养液,R/B=7∶1处理光合速率较高。综上所述,采用霍格兰营养液,R/B=7∶1时有助于番茄苗期株高以及生物量的增加,是适宜番茄苗期生长的较优组合。 相似文献
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《中国瓜菜》2021,(6)
以冀鹰椒6号朝天椒幼苗为试验材料,以自然光为CK,设置LED灯2种光质(红光∶蓝光=3∶1、红光∶蓝光=5∶1)和2种光强(100、150μmol·m~(-2)·s~(-1))双因素试验,研究了不同光强及光质配比模式的LED光源对辣椒幼苗生长和光合特性的影响。结果表明,不同光强和光质配比模式LED光源对辣椒幼苗的生长和光合特性有一定影响。在所有处理中,处理Ⅰ(光强100μmol·m~(-2)·s~(-1)+光质红光∶蓝光=5∶1)辣椒幼苗株高、茎粗、叶片数、叶面积、地上地下干物质量、生长速率等生长指标均最高,叶片净光合速率、气孔导度和蒸腾速率等指标也最大,处理Ⅰ光源最有利于辣椒幼苗的生长。 相似文献
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The effects of combinations of salinity (no salt, 2000 p.p.m. or 4000 p.p.m. of CaCl2 and NaCl, 1:1) and water table (30 cm, 60 cm or 90 cm from the soil surface), on the vegetative growth and tolerance of ‘Golden Japanese’ plum and ‘Mit Ghamre’ and ‘Balady’ peaches were studied. The plants were grown in lysimeters. The growth of the trunk, total shoot length, the increase in shoot length per cm and the fresh weight of top, root and total plant were reduced with increasing salinity of the irrigation water. The effect was accentuated when the plants were maintained at high water table level. The salinity treatments resulted in the death of 43%, 73% and 76% of the plants in the plum, and the ‘Mit Ghamre’ and ‘Balady’ peaches, respectively, indicating that the plum is more tolerant to salinity than the peach. The plants of the salinity treatments showed various symptoms of salt injury, such as leaf burn, defoliation, shoot die-back and finally death. In the peaches, salt injury started to occur in the first growing-season, whereas the salt injury appeared in the plum in the second growing-season. The symptoms were more pronounced in the 4000 p.p.m. treatment than in the 2000 p.p.m. treatment and were more pronounced at the high water table level. The salinity level was the predominant factor and the effect of the water table on the vegetative growth diminished with increase in the salinity level of the irrigation water. 相似文献
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AIM：To establish a fast, accurate and economical technique for culturing mouse pulmonary arteriolar smooth muscle cells (PASMCs), and to explore the effects of hypoxia on the proliferation and apoptosis of the PASMCs. METHODS：In sterile condition, the pulmonary artery was isolated from the male BALB/c mice by digesting with collagenase I, and the cells were cultured in fetal bovine serum-coated flask. Centrifugal procedure was not used during the cell passage. The cell morphology was observed under an inverted phase-contrast microscope. α-Smooth muscle actin was identified by immunocytochemistry and immunofluorescence. The effects of hypoxia on the proliferation and apoptosis of the PASMCs were detected by CCK-8 assay and TUNEL assay. RESULTS：PASMCs were identified by the methods of immunocytochemistry, immunofluorescence staining and observation of morphology. Unlike the rat PASMCs with typical subcultured peak-vally pattern, the mouse PASMCs showed a lot different without a peak-vally pattern. The cells could be subcultured after 5 d to 7 d and there was 3 to 5 generations depending on the activity of the cells. CCK-8 assay demonstrated that the A values of PASMCs exposed to hypoxia increased after 24 h (P＜0.05) as compared with normoxia. TUNEL result showed that the apoptotic index of the PASMCs in hypoxia decreased after 24 h (P<0.05). CONCLUSION：This technique for obtaining cultured mouse PASMCs is simple, fast, accurate and economical. The digestion time is easy to control. Hypoxia promotes the proliferation and inhibits the apoptosis of PASMCs. 相似文献
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小檗碱和壳聚糖抗蔬菜病原真菌活性测定及复合膜制备 总被引：2，自引：0，他引：2
研究了小檗碱和壳聚糖对几种常见蔬菜病原真菌的抑制活性,以及以小檗碱和壳聚糖为主料制备复合膜的方法,并测定了该膜的药物释放效果。试验表明:低浓度(0.234 mg/mL)小檗碱即可抑制辣椒炭疽病菌(Vermicularia capsici)等5种蔬菜病原真菌的生长。20 mg/mL浓度壳聚糖对番茄灰霉病菌(Botrytis cinerea)的抑制率高达65%,而对其余4种果蔬病原真菌也有一定的抑制作用。为了集成这2种天然化合物的优点,制备了小檗碱-壳聚糖复合膜,该膜具有缓释功能,在模拟外部环境(磷酸缓冲液,pH 6.8)条件下,20 d小檗碱累计释放率接近25%,提示其在果蔬贮藏抗菌中的应用价值。 相似文献
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钾肥在小白菜和萝卜上的施用效果 总被引：6，自引：0，他引：6
采用盆栽试验方法研究了施用钾肥对小白菜、萝卜生长发育、产量、品质及钾素含量的影响。结果表明 ,施用钾肥对小白菜和水萝卜的株高、叶片数无显著的影响 ,但可提高水萝卜块根的产量 ,提高幅度为 31.0 4 %～ 97.93%。施用钾肥可提高小白菜和萝卜的蛋白质和VC含量 ,降低硝酸盐含量 ,增加植株的钾素含量 相似文献
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Fresh onion seeds desiccated to 6.0% seed moisture content (SMC) were stored in various packaging materials under different storage conditions. Seeds packed in aluminum-laminated pouches beside those stored with silica gel at 25 °C maintained satisfactory germinability and vigour after 12 months. Desiccated seeds stored in moisture impervious containers produced more vigourous seedlings. Germination potential of onion seeds increased with reduced SMC besides storage in moisture impervious packets along with desiccants as physiological and biochemical attributes are regulated. Seed viability and vigour decreased with accelerated ageing due to increased lipid peroxidation, decreased activities of several free radical and peroxide scavenging enzymes. Electrical conductance of seed leachates also increased with ageing. Thus, adoption of appropriate storage temperature and moisture control techniques would significantly affect onion seed quality, which was due to minimum accumulation of free peroxide radicals and enhanced activity of free radical scavenging enzymes. 相似文献