THE GROWTH OF EUPHRASIA IN CULTIVATION
THE GROWTH OF EUPHRASIA IN CULTIVATION
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栽培中的大戟的生长
DOI：
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发表时间：
1964
期刊：
影响因子：
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通讯作者：
P. Yeo
中科院分区：
文献类型：
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作者：
P. Yeo
以前的研究人员发现，无论是否提供寄主植物，胡杨都可以在栽培中成熟（尽管有寄主比没有寄主生长得更好），并且还发现各种各样的一年生和多年生草本植物都可以作为寄主。本文主要描述了在陶罐中的培养，将幼树作为幼苗移栽到陶罐中。通常情况下，有寄主时比没有寄主时生长得好，但没有寄主时生长得比以前的工人好。一些无寄主植物的发育受土壤成分差异的影响较大。与寄主一起种植后几周内的生长突增表明寄生在寄主上，幼童与寄主之间的距离越短，寄生发生得越快。与某些豆科植物一起生长的胡杨特别健壮，并表现出氮供应良好的症状。一些发育严重迟缓的胡杨植物可能被其邻居寄生。幼童花有时很早开花，开始于一个很低的节；这似乎是由异常高温引起的。早花品种尤其频繁受到这种影响，这使得这些品种的正常植株难以培育。幼嫩的欧亚植物主要在寒冷、沉闷的天气中死亡，但通过节约浇水可以减少死亡。不同寄主的不同种类的胡杨的培养表明，某些寄主是好的，而其他寄主是坏的或可能是坏的。有迹象表明，在同一寄主上，假kerneri和anglica的生长存在差异。同一胡杨种的不同居群有时在寄主反应上存在差异。寄主影响了小檗的成活率、死亡率和活力。在露天栽培中，将胡杨植物和寄主种植在沥青纸罐中，并将其埋入地下。以车前草为寄主植物，获得了良好的生长效果。寄生习性可能不是导致胡杨分类复杂的原因，但可能与自然界的群居性有关。以前的工作
Previous workers found that Euphrasia could be brought to maturity in cultivation whether supplied with a host-plant or not (though better growth was obtained with a host than without), and found also that a wide variety of annual and perennial herbs could act as hosts. The present paper describes chiefly cultures in clay pots, into which the Euphrasias were transplanted as seedlings. Usually growth was better when a host was provided than when it was not, but growth without a host was better than that obtained by previous workers. The development of some plants without a host was much affected by a difference of soil composi tion. A spurt of growth some weeks after planting with a host was taken to indicate parasitic establishment on the host, and the shorter the distance between the Euphrasia and its host the sooner establishment occurred. Euphrasias grown with certain Leguminosae were particularly vigorous and showed symptoms of a good nitrogen supply. Some severely retarded Euphrasia plants were probably being parasitized by their neighbours. Euphrasias sometimes flowered very early, beginning at a very low node; this appeared to be caused by unusually high temperatures. The early-flowering species were particularly frequently affected in this way, which made it difficult to raise normal plants of these species. Deaths of young Euphrasia plants took place chiefly in cold, dull weather, but were reduced by watering sparingly. Cultures of various Euphrasia species with various hosts showed that certain hosts were good, and that others were bad or probably bad. There were indications of a difference between E. pseudokerneri and E. anglica in their growth on the same hosts. Different populations of the same Euphrasia species sometimes differed in their host-reactions. The host affected percentage establishment, mortality and vigour of the Euphrasias. For cultivation in the open ground Euphrasia plants and hosts were planted in bituminized paper pots, which were embedded in the ground. Very vigorous growth was obtained in this way, using Plantago lanceo/ata as a host-plant. The parasitic habit is probably not responsible for the taxonomic complexity of Euphrasia, but may be connected with its gregariousness in nature. PREVIOUS WORK