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铝浸种对火龙果种子萌发的影响 总被引:2,自引:0,他引:2
以火龙果种子为研究材料,设置了7个铝浸种浓度(0、0.1 mg/L、1 mg/L、10 mg/L、100 mg/L、1 000 mg/L、2 000 mg/L),研究了不同浓度的铝浸种处理对火龙果种子萌发的影响.结果表明:不同浓度铝处理火龙果种子均具有生理活性,它们对火龙果种子的发芽势、发芽率、发芽指数、幼苗鲜重和活力指数均具有明显的生理作用.7种铝处理浓度中,0.1 mg/L铝处理效果最好.当处理浓度超过2 000 mg/L时,火龙果幼苗生长受到毒害. 相似文献
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以菊苣(Cichorium intybus L.)为试验材料,研究了铝胁迫对菊苣种子萌发特性的影响,结果表明:随铝离子浓度增加菊苣种子发芽率和发芽势均有所降低,降幅分别为2.05%~10.24%和3.43%~12.03%;在铝浓度大于50 mg/L的处理中,菊苣发芽势虽有下降,但处理间差异不显著;在铝胁迫下,菊苣种子根生长受严重抑制,且变粗、易断、颜色加深,铝浓度达到200 mg/L时,根停止生长;随着铝离子浓度的增加,种子根的耐受指数呈指数型下降趋势(y=239.26e-0.827x,R2=0.942 3),苗长与种子根长呈显著正相关关系(R=0.900 8,p<0.05).由此可见,铝胁迫对菊苣种子萌发及幼苗生长抑制作用明显,即菊苣对环境中铝的耐受性较差,因此,在酸铝土壤地区应该通过育种途径筛选出耐铝品种. 相似文献
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酸铝浸种对荞麦种子萌发的影响 总被引:12,自引:3,他引:12
用不同浓度不同pH值 (浓度分别为:0,10,100,1 000,2 500,5 000 mg/L;pH:3,4,5)的酸铝溶液对荞麦(Fagopyrum esculentum Moench.)进行浸种处理,研究酸铝对荞麦种子萌发的影响.结果表明:低浓度的铝处理对荞麦种子萌发及种子萌发后根的生长有促进作用,而高浓度的铝处理对荞麦种子萌发有明显抑制作用;在低浓度铝溶液中,铝的不同形态对荞麦的萌发影响较小,在高浓度铝溶液中,随着pH值的降低,活性铝浓度的增加,对荞麦萌发的抑制作用逐渐增强. 相似文献
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植物生长调节剂对香椿种子发芽力的影响 总被引:3,自引:0,他引:3
本试验研究了不同浓度的云大-120、赤霉素浸种处理对香椿种子发芽力的影响。试验结果表明,500mg/L云大-120浸种处理对香椿种子发芽起到了显著的促进作用,显著提高了香椿种子的发芽率,极显著提高了香椿种子的发芽势。25~60mg/LGA3浸种处理对香椿种子发芽的影响不显著。 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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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
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Based on the relation between the incipient yield pressure and the limit of yielding in cylinder according to the elastic disabled rule, a laboratorial method of determining limit of yielding of material is designed and a set of experimental data were gained by the method. The incipient yield pressure of the cylinder is gained by analyzing the experimental data, and then the limit of yielding is gained. The laboratorial method has a good reliability as the experimental value has a little error to the theory value. It has a definite engineering signification and theory value to research the mechanical capability of material and the disabled rule of high pressure vessel. 相似文献