共查询到20条相似文献，搜索用时 78 毫秒
1.
2.
3.
云木香种子质量检验方法的研究 总被引：2，自引：0，他引：2
目的:研究云木香种子质量检测方法,为制定云木香种子检验规程以及种子质量标准提供依据.方法:参考国际植物种子检验规程和中国农作物种子检验规程的方法;结果与结论:采用风选法筛选云木香种子;种子净度为80%～90%;种子质量的测定方法宜选用百粒法;种子水分的测定用低恒温烘干法,烘干时间为4h;用四唑染色法测定种子生活力的最佳条件是种子常温浸泡12 h,TTC溶液浓度为0.5%,染色温度为35℃,染色时间3h;云木香种子发芽最适温度为25℃,不需光照,发芽床选纸上或纸间均可,发芽初次计数时间为置床后第4天,末次计数时间为置床后第8天. 相似文献
4.
5.
6.
7.
8.
关苍术种子萌发特性的研究 总被引：1，自引：0，他引：1
对关苍术(Atractylodes japonica koidz.ex kitam)种子的萌发特性进行了研究.结果表明,关苍术种子的含水量为11.57％,具有良好的吸水性;TTC(四氮唑)染色法测得的关苍术种子的生活力较高,为98.00％;关苍术种子萌发的最适宜温度为15℃;采用滤纸为发芽床种子萌发效果比较好;冷冻处理和20％ PEG-4000溶液处理对关苍术种子的萌发都有促进作用,冷冻处理条件下种子发芽率和发芽势达到最高,分别为76.00％和70.00％,而100 mg/L GA3处理对种子萌发没有促进作用. 相似文献
9.
低温及赤霉素处理丝棉木种子对其发芽力的影响 总被引：1，自引：0，他引：1
以丝棉木种子为材料,采用不同浓度赤霉素处理,结合低温层积,对丝棉木种子发芽进行试验研究.结果表明:赤霉素处理能极显著提高丝棉木种子发芽率、发芽势和发芽指数.经过低温处理30 d的丝棉木种子,播种前用赤霉素浓度150mg/L浸泡24 h可有效提高种子的发芽力;未经低温处理的丝棉木种子,播种前用赤霉素浓度3 000 mg/L浸泡24 h,可有效提高种子的发芽力,从而取代低温层积处理的过程. 相似文献
10.
《种子》2021,(7)
为了探究肉桂种子生物学特性及生活力测定的最适条件,对肉桂种子形态特征、千粒重、萌发特性、生活力等进行研究,探索不同萌发环境对肉桂种子发芽率的影响,并采用2,3,5-氯化三苯基氯化四氮唑(TTC)染色法测定肉桂种子生活力,通过正交设计研究不同染色温度、染色时间、TTC溶液浓度对肉桂种子生活力测定的影响。结果表明,肉桂种子平均长度为10.89 mm,平均直径为7.41 mm,千粒重为262.41 g,含水量为35.99%,在湿沙条件下发芽率最高,为76.76%;极差分析表明,TTC浓度和染色温度是影响肉桂种子生活力的较重要的因素。研究表明,湿沙催芽能显著提高肉桂种子发芽率,TTC法最佳染色条件为TTC浓度为1%、染色温度为35℃、染色时间为8 h。 相似文献
11.
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
12.
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
13.
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
14.
15.
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
16.
17.
18.
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
19.
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
20.
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