共查询到19条相似文献，搜索用时 234 毫秒
1.
不同光质对叶用莴苣生长和品质的影响 总被引：8，自引：0，他引：8
本研究旨在探讨不同光质对叶用莴苣生长和品质的影响。以不同颜色荧光灯(白光、红光、蓝光、黄光)为光源,在人工控制的条件下对叶用莴苣照光25d后进行生长和品质指标的测定。结果表明:黄光对叶用莴苣的生长效果好,其次是白光,红光和蓝光对叶用莴苣生长不利;可溶性糖含量以黄光处理最高,之后依次是红光、蓝光;可溶性蛋白、Vc、干物质含量以黄光最高,其次是蓝光,硝酸盐含量以黄光处理的最低,而蓝光、红光处理,其含量与对照相比有显著的提高;蓝光处理下植株的Mg、Zn、Cu、Mn含量显著高于白光。结论:黄光对提高叶用莴苣的食用品质效果最好,但蓝光更有利于显著提高叶用莴苣矿质元素的含量。 相似文献
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不同光质对叶用莴苣生长和品质的影响 总被引：2，自引：0，他引：2
本研究旨在探讨不同光质对叶用莴苣生长和品质的影响。以不同颜色荧光灯（白光、红光、蓝光、黄光）为光源,在人工控制的条件下对叶用莴苣照光25d后进行生长和品质指标的测定。结果表明：黄光对叶用莴苣的生长效果好,其次是白光,红光和蓝光对叶用莴苣生长不利;可溶性糖含量以黄光处理最高,之后依次是红光、蓝光;可溶性蛋白、Vc、干物质含量以黄光最高,其次是蓝光,硝酸盐含量以黄光处理的最低,而蓝光、红光处理,其含量与对照相比有显著的提高;蓝光处理下植株的Mg、Zn、Cu、Mn含量显著高于白光。结论：黄光对提高叶用莴苣的食用品质效果最好,但蓝光更有利于显著提高叶用莴苣矿质元素的含量。 相似文献
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红蓝光质对番茄幼苗氮水平和代谢关键酶及基因表达的影响 总被引：3，自引：0，他引：3
采用LED(发光二极管)精量调制光源,以番茄品种‘SV0313TG’为试材,设置红光、蓝光和红蓝(3︰1)组合光处理,以白光处理为对照,测定番茄幼苗叶片中主要含氮物质(全氮、硝态氮、铵态氮、游离氨基酸、可溶性蛋白质)含量和氮代谢关键酶[硝酸还原酶(NR)、亚硝酸还原酶(NiR)、谷氨酰胺合成酶(GS)、谷氨酸脱氢酶(GDH)、天冬酰胺合成酶(AS)和谷氨酸合成酶(GOGAT)]活性及其基因表达。结果表明,红蓝组合光处理下硝态氮含量、NR和GDH活性及6种氮代谢关键酶的基因表达量显著高于对照和其他处理,可溶性蛋白含量明显高于红光和对照处理,但与蓝光处理无显著差异;与对照和其他处理相比,蓝光处理下铵态氮和游离氨基酸含量显著升高,NR、NiR、GS和GOGAT活性及NR、NiR、GS2、FdGOGAT和LEAS1相对表达量显著高于对照;与对照相比,红光显著降低了全氮含量,NiR、GOGAT、GDH和AS活性及GDH1表达量均受到抑制。综上,与对照相比,红光处理降低了番茄幼苗叶片全氮含量和部分氮代谢酶活性;蓝光处理则提高了游离氨基酸和铵态氮含量;红蓝组合光能够提高氮代谢相关酶转录水平和部分关键酶活性,进而促进氮素吸收并向可溶性蛋白转化。可见,适宜比例的红蓝组合光可促进番茄幼苗氮的同化及转化氮的吸收,加速物质积累,进而促进番茄幼苗生长。 相似文献
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以水芹品种金陵1号为试材，采用富营养水栽培方式，利用柱前衍生高效液相色谱法(HPLC-MS/MS)测定水芹不同器官的氨基酸组分及含量，并评价其营养价值与风味特征。结果表明：在水芹中检出22种水解氨基酸、23种游离氨基酸，其中包含8种必需氨基酸、9种药用氨基酸；总水解氨基酸在不同器官中的含量由高到低依次为：叶(19.29 mg · g-1)>根(5.79 mg · g-1)>茎(4.06 mg · g-1)，总游离氨基酸含量为：茎(1.99 mg · g-1)>根(1.48 mg · g-1)>叶(0.85 mg · g-1)；根、茎、叶中药用氨基酸含量与总氨基酸含量的比值(M/T)分别高达65.18%、72.75%、61.86%。营养评价显示，水芹各器官必需氨基酸的比值系数分(SRCAA)由高到低依次为：叶(62.94)>根(59.78)>茎(56.59)。风味评价显示，鲜味氨基酸为水芹主要呈味氨基酸，鲜、甜味氨基酸含量... 相似文献
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以华京小白菜品种为试验材料,利用LED精量调制光源,设红光、蓝光、红/蓝(3/1)、红/蓝(7/1)、白/红/蓝(3/2/1)5个处理,以白光为对照,研究不同光质对小白菜生长及营养品质的影响。试验结果表明,红/蓝(7/1)处理下小白菜植株茎粗、叶宽、叶面积及根系长度均显著高于其他处理;光合速率、气孔导度、蒸腾速率均以红光处理最高,而蓝光处理下有较高的胞间CO2浓度;红/蓝(7/1)处理下具有较高的CAT和SOD活性;红光可以提高可溶性糖含量,而蓝光却能提高可溶性蛋白含量,白光能增加维生素C与游离氨基酸含量。综合分析得出,红/蓝(7/1)有利于小白菜生长,提高品质。 相似文献
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外源氮对盐胁迫下库拉索芦荟幼苗生长和养分含量的影响 总被引：6，自引：0，他引：6
研究了外源不同浓度硝酸铵对盐胁迫下库拉索芦荟幼苗生长和养分含量的影响。结果表明,外施硝酸铵(3.75～18.75 mmol·L - 1 ) 能够显著增加NaCl 200 mmol·L - 1胁迫下植株的干质量。随着供氮水平的增加, 叶片中氮、磷、钾、游离氨基酸、可溶性糖、可溶性蛋白质和总蒽醌的含量均明显增加, 并在外施11.25～15 mmol·L - 1硝酸铵时达到最大值; 而外施硝酸铵浓度增至18.75 mmol·L - 1时, 各指标均表现出不同程度的下降。不同叶位叶片各指标含量存在较大差异, 上位叶全磷、总蒽醌及可溶性蛋白质的含量较高, 中位叶可溶性糖的含量较高, 全氮在下位叶积累较多。氮、磷、钾、游离氨基酸、可溶性糖及可溶性蛋白质等含量的增加在某种程度上是外源氮提高了芦荟植株抗盐性的重要原因之一。 相似文献
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红蓝LED光全生育期照射对樱桃番茄果实品质的影响 总被引：6，自引：1，他引：5
采用红蓝组合LED光源全生育期照射植株,研究不同配比的红蓝光对樱桃番茄果实品质的影响。结果表明:蓝光占60%时,单果质量和单株果数都显著大于其他处理,蓝光比例增大促进果实中番茄红素、可溶性固形物、游离氨基酸和类黄酮的形成,提升糖酸比值;红光比例增大促进果实中可滴定酸的形成;蓝光所占比例为50%时,果实中可溶性蛋白含量较高,比例提高到60%时蔗糖、可溶性糖、VC含量较高;而蓝光所占比例为25%时果实中番茄红素、可溶性固形物、可溶性蛋白含量较低,且可溶性糖、蔗糖、游离氨基酸、花青素的含量都较低。说明樱桃番茄果实品质明显受光质的调控,在一定范围内,红蓝光比值对果实营养品质的影响无质的差异,当蓝光所占比例较大时,有利于营养物质的积累,蓝光占25%时不利于果实品质的提高,蓝光占60%较有利于果实品质的提高。 相似文献
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以菜心为材料,采用分产品器官(薹茎、叶片、叶柄、花蕾)和整个产品器官匀浆的方法,测定了维生素C、可溶性糖、游离氨基酸和硝酸盐含量,研究其分配和积累规律。试验结果表明,花蕾的维生素C、可溶性糖、游离氨基酸含量均最高,薹茎次之,叶柄与叶片较低;叶柄的硝酸盐含量最高,其他3种器官间差异不显著。从积累量看,薹茎和花蕾积累了79.8%的可溶性糖、70.3%的游离氨基酸和68.1%的维生素C,远高于其他器官积累量。硝酸盐主要积累在薹茎中,其次是叶柄和叶片,花蕾中最少。利用整个产品器官匀浆测定的维生素C、可溶性糖、游离氨基酸和硝酸盐含量计算的积累量,与分器官加权求和的方法获得的数值间差异不显著。 相似文献
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不同光质对番茄幼苗生长和生理特性的影响 总被引：71，自引：5，他引：71
就不同光质(蓝光、绿光、黄光、红光及白光) 对番茄幼苗生长和生理特性的影响做了探究。结果表明, 红光处理的幼苗干物质积累多, 叶面积扩展快, 叶绿素含量、光合速率、可溶性糖及总糖含量均最高, 叶绿素a /b比值及总氮含量最低。蓝光处理幼苗的茎粗、叶面积、根系活力、光合速率均显著高于对照(白光) 。壮苗指数以蓝光或红光处理的较好, 说明在苗期照射红光或蓝光可促进番茄幼苗的生长, 有利于培育壮苗。蓝光处理幼苗花期提早, 产量显著提高。 相似文献
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Improving spinach,radish, and lettuce growth under red light-emitting diodes (LEDs) with blue light supplementation 总被引：5，自引：0，他引：5
Yorio NC Goins GD Kagie HR Wheeler RM Sager JC 《HortScience : a publication of the American Society for Horticultural Science》2001,36(2):380-383
Radish (Raphanus sativus L. cv. Cherriette), lettuce (Lactuca sativa L. cv. Waldmann's Green), and spinach (Spinacea oleracea L. cv. Nordic IV) plants were grown under 660-nm red light-emitting diodes (LEDs) and were compared at equal photosynthetic photon flux (PPF) with either plants grown under cool-white fluorescent lamps (CWF) or red LEDs supplemented with 10% (30 micromoles m-2 s-1) blue light (400-500 nm) from blue fluorescent (BF) lamps. At 21 days after planting (DAP), leaf photosynthetic rates and stomatal conductance were greater for plants grown under CWF light than for those grown under red LEDs, with or without supplemental blue light. At harvest (21 DAP), total dry-weight accumulation was significantly lower for all species tested when grown under red LEDs alone than when grown under CWF light or red LEDs + 10% BF light. Moreover, total dry weight for radish and spinach was significantly lower under red LEDs + 10% BF than under CWF light, suggesting that addition of blue light to the red LEDs was still insufficient for achieving maximal growth for these crops. 相似文献
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SummaryThe effect of pre-harvest light intensity on the quality of hydroponically-grown lettuce (Lactuca sativa var. capitata L.) was studied by growing lettuce under 48 h of continuous illumination delivered by red- or blue-light-emitting diodes (LEDs) with a red:blue ratio of 4.0. Four light intensity treatments (50, 100, 150, or 200 µmol m–2 s–1) were applied. The results showed that the nitrate concentrations in lettuce shoots decreased significantly after treatment with 48 h of continuous light, while the contents of soluble sugars and vitamin C increased substantially. It was observed that the effect of pre-harvest short-duration continuous light (PSCL) on improving lettuce quality was significantly influenced by the intensity of the light. The decrease in nitrate concentration and the increases in soluble sugars and vitamin C contents were relatively low at a light intensity of 50 µmol m–2 s–1, but increased gradually as the light intensity increased from 50 µmol m–2 s–1 to 200 µmol m–2 s–1. However, the marginal benefit of increased light intensity in lowering nitrate concentration and increaseing vitamin C content declined rapidly when the light intensity increased beyond 100 µmol m–2 s–1. In conclusion, PSCL offers an effective method by which to improve the quality of lettuce, and a light intensity of between 100 µmol m–2 s–1 – 150 µmol m–2 s–1 is the economic optimum. 相似文献
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为改善植物工厂中生菜干烧心严重的情况，同时提高生菜的产量及品质，以绿雅生菜、意大利生菜为试材，利用LED精准调控光源，分别对2个生菜品种给予红光、蓝光、绿光、白光处理，研究光质对生菜生长形态、品质、光合作用能力及干烧心病害的影响。结果表明：在蓝光照射处理下生菜的维生素C及可溶性蛋白含量相较于其他光质处理均有一定的提升，但硝态氮含量及干烧心率同样提高；绿光处理下生菜的干烧心率降低，但产量及各项营养品质均低于其他处理；红光处理下生菜的干烧心率较低，品质尤其可溶性糖含量、维生素C含量提升。在工厂化生菜栽培中，增加更高比例的红光可提高生菜品质，同时减缓生菜的干烧心病害的发生。 相似文献
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Green-light supplementation for enhanced lettuce growth under red- and blue-light-emitting diodes 总被引：9，自引：0，他引：9
Kim HH Goins GD Wheeler RM Sager JC 《HortScience : a publication of the American Society for Horticultural Science》2004,39(7):1617-1622
Plants will be an important component of future long-term space missions. Lighting systems for growing plants will need to be lightweight, reliable, and durable, and light-emitting diodes (LEDs) have these characteristics. Previous studies demonstrated that the combination of red and blue light was an effective light source for several crops. Yet the appearance of plants under red and blue lighting is purplish gray making visual assessment of any problems difficult. The addition of green light would make the plant leave appear green and normal similar to a natural setting under white light and may also offer a psychological benefit to the crew. Green supplemental lighting could also offer benefits, since green light can better penetrate the plant canopy and potentially increase plant growth by increasing photosynthesis from the leaves in the lower canopy. In this study, four light sources were tested: 1) red and blue LEDs (RB), 2) red and blue LEDs with green fluorescent lamps (RGB), 3) green fluorescent lamps (GF), and 4) cool-white fluorescent lamps (CWF), that provided 0%, 24%, 86%, and 51% of the total PPF in the green region of the spectrum, respectively. The addition of 24% green light (500 to 600 nm) to red and blue LEDs (RGB treatment) enhanced plant growth. The RGB treatment plants produced more biomass than the plants grown under the cool-white fluorescent lamps (CWF treatment), a commonly tested light source used as a broad-spectrum control. 相似文献
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不同红蓝LED光照强度对叶用莴苣生长和品质的影响 总被引：4，自引：0，他引：4
以叶用莴苣品种永荣为试验材料,探讨了光照强度为100 μmol?m-2?s-1（RB100）、200 μmol?m-2?s-1（RB200）和300 μmol?m-2?s-1（RB300）的红蓝LED光源对叶用莴苣生长与品质的影响,结果显示：与其他处理相比,RB100处理叶用莴苣植株高度、叶面积、根长、比叶面积等形态指标及可溶性蛋白含量显著增加|RB300处理叶用莴苣中VC含量最高,硝酸盐和叶绿素含量最低。结果表明：300 μmol?m-2?s-1光照强度有利于提高叶用莴苣的品质,而100 μmol?m-2?s-1光照强度有利于叶用莴苣的生长。 相似文献
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Hoenecke ME Bula RJ Tibbitts TW 《HortScience : a publication of the American Society for Horticultural Science》1992,27(5):427-430
Light-emitting diodes (LEDs) with high-intensity output are being studied as a photosynthetic light source for plants. High-output LEDs have peak emission at approximately 660 nm concentrated in a waveband of +/- 30 nm. Lettuce (Lactuca sativa Grand Rapids') seedlings developed extended hypocotyls and elongated cotyledons when grown under these LEDs as a sole source of irradiance. This extension and elongation was prevented when the red LED radiation was supplemented with more than 15 micromoles m-2 s-1 of 400- to 500-nm photons from blue fluorescent lamps. Blue radiation effects were independent of the photon level of the red radiation. 相似文献
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Embryogenic calli of Oncidium were grown under tubular fluorescent lamp (FL) or light-emitting diode (LED) arrays with different spectra to determine the effects of light quality on protocorm-like body (PLB) formation and plantlet growth from the callus. The effect of light is generated by monochromatic blue, red or mixed far-red LEDs on the photomixotrophic radiation. The light sources induced higher number of PLB formation compared with the darkness. The best condition for PLB formation was to culture on MS half salt medium supplemented with 0.1 mg l−1 NAA and 0.4 mg l−1 BA under red + blue + far-red (RBFr) LEDs and FL radiation for 8 weeks. Roughly 3000 embryos were induced in an initial culture of 1 g of fresh weight of calluses. During subculturing, PLBs had the ability to convert into plantlets. In this study also indicated the far-red LED radiation was a noticeable factor. It showed that using Fr combined with R and B (RBFr) or RFr radiation significantly enhanced leaf expansion, numbers of leave and root, chl contents, fresh and dry weight of Oncidium plantlets. Therefore, the wavelength specificity of RBFr LEDs comprising a novel illumination system is advantageous over FLs for PLB formation, resulting in higher efficiencies of plant regeneration and growth in Oncidium cultures. 相似文献
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以生菜为试材,分别在3种不同光质的红、蓝和远红三色发光二极管组合灯补光条件下和温室自然条件下栽培37d后测定其生长指标及光合特性。结果表明,经适当光质的三色发光二极管组合灯补光后,生菜的叶片数、叶片长、叶质量和整个生菜的鲜质量均有明显的增长;生菜叶中的矿物质元素含量均有不同幅度的提高;生菜的光补偿点和光饱和点升高,光合能力增强,气孔导度加大,蒸腾速率加快,叶绿素相对含量提高,但胞间二氧化碳浓度略有下降;补光使生菜的品质得到了提高,其中以R∶B∶FR（红光∶蓝光∶远红光）=5∶1∶0.15最佳,R∶B∶FR=6∶1∶0.18次之。 相似文献