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不同贮藏与萌发方式下的亮叶桦种子萌发差异 总被引:1,自引:1,他引:0
亮叶桦是我国特有的优良速生树种,其种子贮藏特性备受关注。本研究设置了低温和常温两种处理,通过不同贮藏时间的实验室萌发和土壤萌发试验,探讨不同贮藏与萌发方式下亮叶桦种子的萌发差异。结果表明,低温贮藏条件下,亮叶桦种子活力在1年内未发生显著变化;常温条件下,种子成熟后贮藏160 d,亮叶桦种子发芽能力发生显著改变,但贮藏1年之后仍有50.0%的萌发率。贮藏后萌发条件的不同导致亮叶桦萌发率不同。在昆明自然光照和温度条件下,贮藏时间增加会降低亮叶桦种子在土壤中的萌发率,萌发温度的差异也会影响种子的萌发速度及整齐度,但常温贮藏370 d后的种子在昆明自然状况下的萌发率仍有34.8%,表现出一定的耐贮性。 相似文献
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本研究以椰枣雄株花粉为材料,采用L9(34)正交设计法筛选最佳观察椰枣花粉萌发时间和适宜椰枣花粉离体萌发培养基;研究椰枣花粉干燥时间、贮藏温度和贮藏时间对花粉萌发率的影响。结果表明,椰枣花粉萌发最佳观察时间段为2~4 h;处理1培养基50 g/L蔗糖+0.1 g/L硼酸+0.05 g/L氯化钙效果最佳,其中3因素对椰枣花粉萌发影响大小依次为硼酸、蔗糖、氯化钙;花粉在35℃中干燥8 h最适宜贮藏;当贮藏时间为10~50 d时,常温贮藏的花粉萌发率低甚至无萌发的现象,低于4℃条件下贮藏花粉萌发率均保持较高,无显著差异;当在4℃条件下,10、20、30 d花粉萌发率均无显著差异,当在-20℃,-80℃条件下,10、20、30、40 d花粉萌发率均无显著差异,花粉均保持较高的萌发率,在低温贮藏中随着贮藏时间的延长花粉萌发率逐渐下降。本研究可为椰枣花粉活力检测和贮藏提供技术支撑,同时为今后在椰枣引种推广中的花粉贮藏和人工授粉提供科学依据和实践意义。 相似文献
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目的:为探讨金铁锁种子适宜的贮藏技术,对不同温度贮藏条件下的金铁锁种子做发芽试验.方法:将金铁锁种子采集后晒干,放置在4,20℃和常温条件下贮藏,在贮藏8个月、10个月和1 2个月时,取出种子做发芽试验.结果:贮藏8个月时,20℃和常温贮藏条件的发芽势分别为56.67%和53.33%,与4℃贮藏条件的发芽势(27.92%)差异显著,发芽率以20℃贮藏最高(83.75%),与4℃和常温贮藏差异显著;贮藏10个月时,常温贮藏的种子失去发芽能力,发芽率为0,4℃和20℃贮藏的发芽势和发芽率无显著差异;贮藏12个月时,4℃贮藏的发芽率最高为71.25%,与20℃贮藏的发芽率差异显著.结论:金铁锁种子应分开存放,对于存放时间超过10个月的种子,可以采用4℃低温冷藏的方式进行,对于存放时间不超过8个月的金铁锁种子,可以在常温下进行贮藏. 相似文献
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傣药倒心盾翅藤种子萌发特性初步研究 总被引:1,自引:0,他引:1
目的:研究倒心盾翅藤种子的萌发特性。方法:测定倒心盾翅藤种子的形态、千粒重和含水量等指标,利用不同温度和光照、种子带翅或不带翅、不同成熟度、贮藏等处理对种子进行发芽试验,测定其发芽率、发芽势和发芽指数。结果:倒心盾翅藤种子发芽适温为25~35℃,其中30℃条件发芽率最高,光照或黑暗条件均可。果翅对种子的发芽率无显著影响,但会影响种子发芽速度和整齐度。不成熟种子采集后经过贮藏后熟,可显著提高发芽率。种子在室温条件下贮藏6个月,发芽率仍高达93.68%,但贮藏12个月后发芽率显著下降。结论:倒心盾翅藤种子属于高温萌发型、光中性种子;种子最适贮藏时间不超过1年。 相似文献
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不同引发处理对野生茄子砧木托鲁巴姆萌发的影响 总被引:5,自引:1,他引:4
在确定托鲁巴姆发芽率的统计时间为第20天的基础上,采用不同化学试剂对托鲁巴姆种子进行引发处理.结果表明:0.50%NaNO3溶液的引发处理能显著提高托鲁巴姆种子的发芽指数和发芽率,0.50%MnCl2溶液的引发处理能显著提高托鲁巴姆种子的发芽指数,对发芽率无影响;在300 mg/kg的外源赤霉素的引发诱导下,托鲁巴姆种子的萌发能力能得到显著提高,浓度过低或过高对托鲁巴姆的萌发影响不大或显著抑制托鲁巴姆的萌发.本试验改进建立了一项新的种子促萌技术:吸湿-预萌发-回干技术,经过该处理预萌发6 d后的托鲁巴姆种子发芽指数和发芽率都显著高于对照,且经过该技术处理后的托鲁巴姆种子促萌效果在常温条件下可保持2个月,在低温条件下可保持3个月以上. 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