共查询到20条相似文献,搜索用时 890 毫秒
1.
2.
植物快繁技术即基于植物组织培养的无性快速繁殖技术 ,又称微繁技术。这项技术是生物技术中成熟最早、应用最广泛的领域之一。到目前为止 ,世界上可利用快速繁殖的植物种类已超过 10 0 0余种 ,我国能成功进行快繁的植物也已超过 10 0多种。利用植物快繁技术 ,可在短时间内繁殖生产大量植株 ,供生产中使用。以兰花快繁为例 ,使用兰花茎尖培养 ,从一个不到 1mm长的茎尖开始 ,1年内可以繁殖出几百万个植株。这种组织培养快繁技术 ,目前已经成为繁殖许多花卉名贵品种常用的方法。在林木的某些树种上 ,用植物快繁技术 ,1棵优良植株在 1年内也可… 相似文献
3.
4.
对云南省杉木优良无性系组培快繁育苗技术进行了研究,从不同的材料采集和诱导培养、继代增殖培养、壮苗培养、生根培养、炼苗和移栽等方面分析了不同条件下苗木的移栽效果,为杉木无性系组培快繁育苗,提供重要的参考价值。 相似文献
6.
7.
曼地亚红豆杉是一种药用、观赏兼用型特色植物,在植物非试管快繁调控系统环境下,对曼地亚红豆杉繁育圃地选择、建设、采穗圃建立、快繁取材、诱根处理、扦插方法、肥水管理、移植出圃等技术环节进行了总结分析,并形成了操作规程。 相似文献
8.
本文综述了宿根花卉离体快繁技术及其相关生理基础研究的国内外进展。离体快繁技术方面主要包括选取外植体、基本培养基和培养方式的选择、外植体的再生方式、组培苗的移栽、玻璃化的产生和防止途径以及影响离体快繁大规模推广的因素;高体快繁生理基础的研究集中于植物生长调节物质与器官分化的关系上。 相似文献
9.
林木组培快繁技术中常见问题及对策 总被引:1,自引:0,他引:1
针对林木组培快繁过程中经常出现的污染、褐化及玻璃化问题的产生原因和控制措施进行了综述,为今后林木组培快繁研究提供技术参考,同时也为开展新品种苗木组培的科研和生产提供理论基础和实践指导。 相似文献
10.
11.
12.
13.
14.
The physiological basis of photosynthesis during winter was investigated in saplings of five evergreen broad-leaved species (Camellia japonica L., Cleyera japonica Thunb., Photinia glabra (Thunb.) Maxim., Castanopsis cuspidata (Thunb.) Schottky and Quercus glauca Thunb.) co-occurring under deciduous canopy trees in a temperate forest. We focused on temperature dependence of photosynthetic rate and capacity as important physiological parameters that determine light-saturated rates of net photosynthesis at low temperatures during winter. Under controlled temperature conditions, maximum rates of ribulose bisphosphate carboxylation and electron transport (Vcmax) and Jmax, respectively) increased exponentially with increasing leaf temperature. The temperature dependence of photosynthetic rate did not differ among species. In the field, photosynthetic capacity, determined as Vcmax and Jmax at a common temperature of 25 degrees C (Vcmax(25) and Jmax(25)), increased until autumn and then decreased in species-specific patterns. Values of Vcmax(25) and Jmax(25) differed among species during winter. There was a positive correlation of Vcmax(25) with area-based nitrogen concentration among leaves during winter in Camellia and Photinia. Interspecific differences in Vcmax(25) were responsible for interspecific differences in light-saturated rates of net photosynthesis during winter. 相似文献
15.
16.
We determined the effects of short-term cultivation with various amounts of available nitrate nitrogen (NO3-) on NO3- use by woody shrub species. Nitrate concentration ([NO3-]) and nitrate reductase activity (NRA) were measured in leaves and roots of seedlings of Hydrangea hirta (Thunb.) Siebold, Lindera triloba (Sieb. et Zucc.) Blume and Pieris japonica (Thunb.) D. Don. Root [NO3-] increased with increasing NO3- supply in all species, whereas leaf [NO3-] remained low. There were significant correlations between [NO3-] in roots and leaves in all species, but no correlation was found between root NRA and leaf NRA. The low proportion of leaf NO3- assimilation to total NO3- assimilation in all species can be ascribed to the lack of NO3- transport from roots to leaves. In all species, root NRA increased with increasing NO3- supply until reaching a plateau. Species ranking based on maximum root NRA was H. hirta > L. triloba > P. japonica. Root NRA in P. japonica was low, even though root [NO3-] increased with NO3- supply, indicating that NO3- was not an effective N source for this species. The ranking also suggested that H. hirta depended more on NO3- as an N source than L. triloba. The increase in root NRA with increasing NO3- supply was greater in H. hirta than in L. triloba, possibly indicating that a change in NO3- availability has a stronger influence on NO3- use in H. hirta than in L. triloba. 相似文献
17.
18.
19.
豆科树种目前已广泛应用于荒山绿化、饲用及观赏。文中从扦插(嫩枝扦插、硬枝扦插、根插),组织培养等方面综述了豆科树种无性快速繁殖技术的研究和进展。指出目前豆科树种嫩枝扦插技术研究还局限在对某一树种繁殖途径的探索阶段;硬枝扦插技术研究较为系统和深入,对不同树种扦插生根的影响因素有了比较深入的了解,并因此建立起较为成熟的技术体系;根插方法简单,成活率高,但是研究普遍较少;豆科树种组织培养虽较为困难,但某些树种也已经建立起了较为完善的再生体系。此外,还对豆科树种快速繁殖的生理基础研究进行了讨论,建议加大对豆科树种快速繁殖技术和生理机制的研究力度,为解决优良种质资源快速扩繁奠定基础。 相似文献
20.
本项目研究抽取了济南南部山区具有典型植被群落特征的18个标准样地,通过对样地植被群落的调查,挖掘了山区植被群落恢复重建过程中存在的问题。在对植被群落类型、结构特征及生态功能分析基础之上,又研究了优势树种与其他物种的种间关系以及物种在群落中的地位,最后综合提出南部山区山体植被群落优化的5种植被搭配模式:(1)侧柏+黄栌-黄荆-羊胡子+日本乱子草;(2)黑松+黄榆-连翘-地榆+黄花菜+大丁;(3)侧柏+黄栌+桑-雀儿舌头-旋覆花;(4)黄连木+大叶白蜡+黑松-扁担木-茜草+委陵菜;(5)侧柏+刺槐+桑-黄荆-桃叶鸦葱+茜草+荩草; 相似文献