共查询到20条相似文献,搜索用时 78 毫秒
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含羞草种子萌发特性研究 总被引:1,自引:1,他引:0
采用浓硫酸酸蚀、烫种、砂磨等不同处理方法对含羞草种子进行萌发试验,测定其发芽率、发芽势及在不同温度下的生长势,探讨含羞草种子的萌发特性。结果表明:未经处理的含羞草种子发芽率为13.6%,硬实率达60.6%;种皮是影响其萌发的主要因素,95℃1min烫种对含羞草种子萌发作用明显,发芽率、发芽势最高,分别为94.3%、92.0%;浓硫酸处理50min也可提高含羞草种子萌发,发芽率、发芽势分别为84.0%,79.7%;砂磨处理发芽率为16.3%,效果不明显;含羞草种子萌发最适温度为30℃。 相似文献
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为提高黄芪硬实种子的发芽率,采用浓硫酸、赤霉素、双氧水、温热水浸种、砂纸摩擦处理黄芪的硬实种子,破除黄芪种子的硬实.结果表明:用浓硫酸处理可以明显提高黄芪硬实种子的发芽率和发芽势,但在后期发芽种子会有死亡,用砂纸摩擦也可以明显提高黄芪硬实种子的发芽率和发芽势,破除黄芪硬实种子可以采用此方法.温水浸种,赤霉素处理,双氧水处理虽然也可以提高黄芪硬实种子的发芽率但效果不明显,以98%浓硫酸处理30min和砂纸摩擦的方法效果较好. 相似文献
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《种子》2018,(11)
刀叶金合欢种子种皮透性差,常规处理种子萌发率低。为获得更高的种子发芽率,采用浓硫酸6种不同拌种时间、4种不同水温处理种子,浸种24h后置床催芽进行比对。结果表明:1)刀叶金合欢种子的种子膨胀率、发芽势、发芽率、发芽指数与浓硫酸拌种时间长短和浸种水温高低处理关系密切;2)水温是影响刀叶金合欢种子膨胀率、发芽势、发芽率、发芽指数的主要因子,浸种处理水温越高,其种子膨胀率、发芽势、发芽率、发芽指数越大;3)浓硫酸不同拌种时间对提高种子膨胀率、发芽势、发芽率、发芽指数起重要作用,经浓硫酸不同拌种时间处理下的种子,其种子膨胀率、发芽势、发芽率、发芽指数,均高于对照处理;4)浓硫酸拌种5min+100℃水温烫种处理,其种子膨胀率、发芽率、发芽指数分别为14.8%、76.4%和2.55%,在本试验中表现最好,种子发芽势则以浓硫酸拌种1min+100℃水温烫种处理最好,达到66.8%,以上与其它处理相同因子比较,差异性也达到显著水平(p0.01)。 相似文献
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珍贵物种顶果木种子休眠及解除方法研究 总被引:1,自引:0,他引:1
为探讨解除顶果木种子休眠的最佳方法,分析了顶果木种子特征、休眠特性及不同处理方法对种子发芽率、发芽势、发芽指数及硬实率的影响。结果表明,自然条件下,顶果木种子发芽率为18.00%,硬实率为79.50%;顶果木种皮和种胚含有萌发抑制物,显著抑制小白菜种子的萌发和生长(p<0.05)。砂磨处理、热水浸种处理、浓H2SO4处理及GA 3处理均可显著提高顶果木种子的发芽率、发芽势和发芽指数,显著降低硬实率(p<0.05)。其中,砂磨时间以70 min为宜,热水浸种以80℃处理效果最佳,浓H2SO4处理以40 min为宜,GA 3处理以浓度200 mg·L^-1为宜,4种处理的发芽率分别为78.00%、84.50%、89.50%和79.00%,发芽势分别为44.00%、71.00%、76.00和63.00%,发芽指数分别为21.52、25.04、26.54和23.05,硬实率分别为19.50%、7.50%、12.50%和15.50%。浓H 2SO 4浸泡40 min和200 mg·L^-1 GA 3浸泡30 min复合处理效果显著优于单一处理,发芽率、发芽势、发芽指数及硬实率分别达到95.50%、84.00%、28.42和4.00%。 相似文献
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浓硫酸及热水处理对翅荚决明种子萌发和幼苗生长的影响 总被引:1,自引:1,他引:0
试验观察了翅荚决明种子外部形态,测定了千粒重、硬实率,并研究了98%浓硫酸酸蚀(处理时间分别为10、20、30、40min)及80℃热水处理(处理时间为20、30 min及40 min)对翅荚决明种子萌发及幼苗生长的影响.结果表明:翅荚决明种子的千粒重为34.63 g,硬实率为90.47%,98%浓硫酸酸蚀及80℃热水处理均能显著提高翅荚决明种子的发芽率,综合各项指标表明,浓硫酸浸泡30 min是打破翅荚决明种子硬实的较好办法,该处理的发芽率、发芽指数、活力指数分别达到90.67%、22.56、4.50,分别比对照提高了2.68倍、3.49倍、3.3倍,而苗高、茎粗、主根长、侧根数及鲜重等与对照相比则无明显差异. 相似文献
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《种子》2019,(4)
为研究盐胁迫对胡枝子属植物种子萌发的影响,以多花胡枝子(Lespedeza floribunda)、截叶铁扫帚(Lespedeza cuneata)、细梗胡枝子(Lespedeza virgata)、绒毛胡枝子(Lespedeza tomentosa)和美丽胡枝子(Lespedeza formosa)5种胡枝子种子为材料,在0%,0.05%,0.15%和0.25%NaCl胁迫下,采用纸上发芽法,研究不同浓度盐胁迫对各品种胡枝子属植物种子相对发芽率、相对发芽指数、相对发芽势、相对活力指数、平均发芽时间及胚根胚芽比的影响。结果表明,轻度盐胁迫对种子的萌发具有促进作用,随盐浓度增加,对种子萌发的抑制作用增强。在这5个品种的胡枝子中,绒毛胡枝子在不同浓度盐胁迫下表现出的耐盐性最强,截叶铁扫帚和美丽胡枝子耐盐性相对较弱。 相似文献
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介绍了运用冷冻干燥技术进行速溶蛋花汤的加工,研究了生产工艺、特点以及影响产品质量的主要因素。试验表明,采用冷冻干燥技术加工的速溶蛋花汤,具有营养丰富、风味独特、方便快捷等特点。 相似文献
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DENG Zhao-jing 《保鲜与加工》2005,(1):153-156
A new definition of inertia,i.e. the momentum is the measuring of inertia of matter, is proposed. The article through and etc., subjects, the correctness of the new notion of inertia:The monentum is the measuring of inertia has been demonstrated, and the unsolved contradictions of the traditional definition of inetia. And the mass is the measuring of inertia has been revealed. 相似文献
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香蕉是热带亚热带发展中国家重要的粮食作物和碳水化合物来源。但近年来,香蕉生产受到严重的病虫危害。大多数香蕉栽培品种是三倍体,生长周期长,而且不孕。由于没有种子,给繁殖和育种带来一定的困难。遗传转化技术的发展为香蕉品种的改良提供了一种有效的手段。香蕉的遗传转化方法有电激法、基因枪法、农杆菌介导法等。农杆菌介导法的应用是香蕉品种改良的一个重大突破。香蕉遗传转化的外植体也发展到多种,有原生质体,胚性细胞悬浮系,分生组织,以及横切薄片等。近几年,随着分子生物学的发展,出现了转化效率更高,重复性更好的香蕉遗传转化技术。如农杆菌和基因枪结合法,离心辅助农杆菌介导法、真空渗透技术等。这些新技术新方法的出现,必将推动香蕉产业高速发展。 相似文献
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基于RS与GIS技术,利用景观生态学理论及景观格局指数对布尔津县土地利用现状进行定量分析。结果显示为:(1)布尔津县以草地、林地为主要景观类型,镶嵌着耕地、水域等景观类型。(2)四个分区(即高山区、丘陵区、平原区、荒漠区)的林地资源组成差异明显,耕地、居民、交通及工矿用地集中分布在丘陵区和平原区(3)从各项指数来看,高山区的多样性指数较低;平原区是受人文因素最多的区域,景观优势度低,各种土地利用类型比例差异不大,有利于生态可持续发展,但要合理的开发利用;荒漠区生态环境相对脆弱,要加强生态环境的保护与改善。通过该研究对布尔津县的土地利用现状作一个了解,为该县乃至整个地区的景观规划和可持续发展战略提供科学依据。 相似文献
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Automobile comfort dynamic simulation is necessary when we predict and evaluate the comfort of a automobile or optimize performance of automobile. The nine DOF vibration model of automobile is established , which acts root mean square value of body in multiple work conditions as comfort evaluation indices. Based on the comfort simulation, the Hongyan 1160 is predicted in the way of comfort. The programmes can be used in many different automobiles . The computational result indicates that the model can simulate vibration of automobile truly. It is significant to research automobile comfort evaluation to optimize performance of automobile and comfort simulation .The computational program can be applied to optimize or simulate which has some reference value. 相似文献
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Efficiency of water use of early plantings of sunflower 总被引:4,自引:0,他引:4
M. Auxiliadora Soriano Francisco Orgaz Francisco J. Villalobos Elías Fereres 《European Journal of Agronomy》2004,21(4):465-476
Rain fed crop production in Mediterranean environments depends to a large extent on strategies that avoid the intense summer drought. Early plantings of sunflower have given consistently higher yields in such environments, but the basis for such yield increases has not been explored. We conducted two field experiments at Cordoba (Spain) to investigate the effects of an early and a late planting date on the components of water-limited crop productivity; namely, water use (T), water use efficiency (TE) and harvest index (HI) of sunflower. The results were generalized by simulating rain fed sunflower yields, under early (1 January) and late (15 March) plantings, for a 25-year period with the aid of a simulation model of the Ceres type (OILCROP-SUN) which has been validated in Cordoba. Experimental seed yields of early plantings in 1989 and 1996 were 2.0 and 3.0 t ha−1, while late plantings yields were 1.3 and 2.4 t ha−1, for the 2 years. Average simulated yields were 2.7 ± 1.1 and 1.9 ± 0.7 t ha−1 for early and late plantings, respectively. For the 2 years, T of early plantings was higher than that of late plantings, but the response of TE and HI to planting date was not the same in the two experiments. In the simulation exercise, T and TE of early plantings were consistently higher than those of late plantings, while there were no differences in the HI for the two planting dates. We conclude that early plantings of sunflower increase rain fed yields by increasing both T and TE, while the impact of planting date on HI very much depends on the crop water stress pattern, which is quite variable from year to year even in the predictable Mediterranean environment. 相似文献
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The cotyledon and hypocotyl of eight varieties of alfalfa( Medicago sativa L. )are used to study the effect of different cultivation procedures and genotypes on embryogenic callus and embryoid induction,plant development and transplant of alfalfa.The varieties of alfalfa with high embryoid induction rate and high differentiation rate are screened. A high frequency regeneration system for alfalfa tissue culture is established:which is benifical to the gene transformation of alfalfa. 相似文献