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首页> 外文期刊>The Journal of Horticultural Science & Biotechnology >Effects of light and nitrogen supply on the allocation of dry matter and calcium in poinsettia (Euphorbia pulcherrima Willd. ex Klotzsch)
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Effects of light and nitrogen supply on the allocation of dry matter and calcium in poinsettia (Euphorbia pulcherrima Willd. ex Klotzsch)

机译：光和氮供应对一品红（Euphorbia pulcherrima Willd。ex Klotzsch）中干物质和钙分配的影响

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摘要

Two poinsettia cultivars were grown under short-day conditions with three levels of supplementary light and four levels of N and the effect on growth and Ca uptake and distribution examined. Light had more influence on dry- weight production than N. The proportion of bract dry weight increased with increasing light and the proportion of leaf dry weight increased with increasing N. Increasing N reduced the root:shoot ratio and stem dry weight. Plants grown with more light had a higher percentage dry matter in all parts, whereas the strongest effect of N was on the stem, where the dry-matter percentage was significantly reduced with increasing N. Concentration and content of N in the plant increased with increasing N supply. Total content of Ca in the shoot of the plant increased with increasing N and light, and correlated well with the increase in dry weight. Ca concentration was lowest in the bracts and, within the bract, most so towards the edges. Light increased the production of dry matter and the uptake of Ca to the same extent resulting in the same concentration of Ca in all light treatments. However, the concentration and total content of Ca in the bracts decreased with increasing N supply, indicating that transport of Ca to the bracts decreased with increasing N. The concentration of Ca in the stem was lowest at lowest N and at highest light, while content was the same for all treatments, indicating a "dilution" effect of Ca in the dry matter.
机译：在短日条件下种植了两个一品红品种，添加了三个水平的补充光和四个水平的N，并研究了其对生长以及Ca吸收和分布的影响。轻对干重的影响大于氮。轻干重的比例随光照的增加而增加，叶干重的比例随氮的增加而增加。氮的增加会降低根：茎比和茎干重。光照较多的植物在所有部位的干物质百分比均较高，而氮对茎的影响最大，其中干物质百分比随氮的增加而显着降低。植物中氮的浓度和含量随氮的增加而增加。 N供应。植物芽中Ca的总含量随氮和光的增加而增加，并且与干重的增加有很好的相关性。 Ca浓度在the片中最低，而在within片中，最接近边缘。光在所有光处理中均以相同的程度增加了干物质的产生和对钙的吸收，从而导致相同浓度的钙。然而，with中Ca的浓度和总含量随氮供应的增加而降低，表明Ca向the中的转运随N的增加而降低。茎中Ca的浓度在最低的N和最高的光照下最低，而含量低。所有处理方法均相同，表明钙在干物质中具有“稀释”作用。

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