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木兰科植物的嫁接繁殖 总被引:14,自引:0,他引:14
本文对38种木兰科植物的嫁接繁殖进行了试验,全部嫁接成功,平均成活率为44.0%。不同属的木兰科植物之间有较大的亲和力,多数种可进行属间嫁接。嫁接时间和砧木选择是影响木兰科植物嫁接成活率的主要因素,嫁接方法对成活率也有一定的影响。木兰科植物的嫁接苗比实生苗具有更强的适应性和速生性。 相似文献
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通过试验表明,漳州水仙在武汉水培时:(一)在本试验期内的自然气温下,40桩规格的商品鳞茎从水培至始花,最多需时83天,最少47天。水培开始早的需时较长,开始晚的需时较短。(二)开花期的长短,与花期内气温平均值明显相关。平均值升高,花期缩短。(三)在本试验所述的条件下,供春节观赏的水仙,应在节前60—70天开始水培。过早,始花期延长,管理费事。过迟,不能适时开花,而且花期将因气温升高而缩短。(四)40桩规格的商品鳞茎,每个平均有花3.2葶,24.8朵。质量较好,而价格较低,适合子一般群众消费。 相似文献
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根据植物顶端生长优势的原理,在猕猴桃(Actinidia chinensis)胚乳培养中,将愈伤组织上分化的芽,切割下来作接穗,利用简单装置,进行“嫩枝顶端嫁接”,嫁接成活率高达90%左右,并至少提前1—2年开花、结果。利用嫩枝顶端嫁接技术,不仅提高了试管苗的成活率,而且在简化培养程序、缩短培养周期、降低培养成本上都有明显的效果。 相似文献
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Dominick J. Paolillo Jr. Norma Chao MacKay Judith Reighard Graffius 《American journal of botany》1969,56(3):344-347
A model of granum structure, consisting of multiple helical frets wound around each cylindrical granum, is proposed as a representation of granum structure for flowering plants in general. This model was originally formulated for grana in the mesophyll plastids of Zea mays and was subsequently extended to grana of Phaseolus vulgaris by additional studies. The model is now shown to be applicable also to grana in the plastids of Cannabis sativa, Elodea canadensis, Nicotiana rustica, Pisum sativum, and Spinacia oleracea. This sample of seven angiosperms includes genera commonly studied by other workers in their ultrastructural investigations of plastid structure. 相似文献
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THE EVOLUTION OF SEX IN FLOWERING PLANTS 总被引:7,自引:0,他引:7
D. LEWIS 《Biological reviews of the Cambridge Philosophical Society》1942,17(1):46-67
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大豆开花后光周期反应的研究 总被引:18,自引:0,他引:18
利用中国大豆主要生态区的生育期不同的代表品种研究了大豆(Glycine m ax (L.)Merr.)开花后对光照长度的反应. 结果表明,不同成熟期的大豆品种开花后普遍存在着对光照长度的反应.这种反应属于典型的光周期现象,而不是由温度的替代作用、光合时间的改变或前期短日后效应引起的.开花后光周期反应不仅存在于大豆的花荚期,而且存在于鼓粒期.研究认为∶大豆开花结实对光周期的需求是一个连续过程;光周期对大豆生育期的调控作用存在于出苗至成熟的全过程;光周期诱导开花和促进成熟的作用有一定的共同性;光周期诱导效果具有持效性和可逆性 相似文献
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Lyness AS 《Plant physiology》1936,11(4):665-688
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THE REGULATION OF ALTERNATION OF GENERATION IN FLOWERING PLANTS 总被引:3,自引:0,他引:3
The developmental changes involved in the alternation of generation represent the major gene-switching events in the life history of plants. While a large number of genes are common to both sporophyte and gametophyte, many thousand sequences are specifically expressed in each generation; indeed, certain key constituents (e.g. tubulin) are encoded by different genes in each generation, indicating that sporophyte and gametophyte are responding to different evolutionary pressures. Evidence is accumulating that major gene-switching events in plants, such as flowering, are regulated by complex control systems which ensures that development occurs only in the correct groups of cells at the appropriate time. A similar, or more sophisticated system might thus be expected to regulate alternation of generation. It is not possible to manipulate alternation of generation in a similar fashion to flowering, but study of apparent aberrations of development occurring in nature and in vitro suggests that alternation only occurs in cells which have become competent to receive particular developmental stimuli. Further, in certain cases, competent cells may be switched either into sporophytic or gametophytic developmental pathways depending upon the nature of the stimulus. Acquisition of competence seems to involve isolation of cells from the symplast, some cytoplasmic dedifferentiation, and perhaps cell cycle arrest or transition. The stimuli in vivo appear metabolic in nature, although embryogenesis may be activated by specific classes of glycoproteins. Interestingly, examination of agamospermic systems suggests that fertilization of the egg per se is not the signal which activates sporophytic development. Once competent cells have received the stimulus they start to develop, with no delay in a ‘determined’ state. Sporophytic and gametophytic development in vivo and in vitro both start with an asymmetric division, except for the female gametophyte which may arise via a range of developmental pathways, depending on the species. 相似文献
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Batches of potato plants in pots were placed in the field for limited periods among plants infected with potato virus Y and leaf roll virus. Some of the potted plants were surrounded by sticky boards which prevented apterous aphids from reaching them. Almost as many plants within the boards as without became infected, indicating that most of the spread of virus was by winged aphids.
Apterae were probably responsible for spreading the viruses throughout a hill after one or more stems were infected. They may carry infection to neighbouring plants, but most of these will have been infected already by alatae.
The number of plants contracting infection was unaffected by watering. 相似文献
Apterae were probably responsible for spreading the viruses throughout a hill after one or more stems were infected. They may carry infection to neighbouring plants, but most of these will have been infected already by alatae.
The number of plants contracting infection was unaffected by watering. 相似文献