Differential effects of light and nitrogen on production of hypericins and leaf glands in Hypericum perforatum
Differential effects of light and nitrogen on production of hypericins and leaf glands in Hypericum perforatum
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DOI：
10.1016/s0981-9428(01)01326-2
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发表时间：
2001-12-01
影响因子：
6.5
通讯作者：
Gawienowski, MC
中科院分区：
文献类型：
--
作者：
Briskin, DP;Gawienowski, MC
以贯叶连翘（Hypericum perforatum L.）在人工照明的沙培系统中生长。将照射圣约翰麦芽汁植物的光强从106 μ mol.m（-2）.s（-1）增加到402 μ mol.m（-2）.s（-1），导致叶金丝桃素水平的持续增加。使用叶解剖的方法，金丝桃素与叶片上的暗腺体的协会，并发现，增加光照强度导致在一个平行的增加暗腺体的数量。在这方面，叶腺体数量和金丝桃素水平之间的线性关系（R = 0.901）。虽然对圣约翰麦芽汁植物的氮供应的减少也产生了叶金丝桃素水平的增加，但这种反应在测试的氮水平范围内以不连续的方式发生，并且观察到对暗叶腺体的数量没有显著影响。总体而言，这些影响增加光照强度和氮供应减少叶金丝桃素似乎是独立的和添加剂，并可能反映这些环境参数影响这些植物化学物质的生产的网站和过程中的差异。(C)2001年，Elsevier SAS科学与医学版。
The effect of light intensity and root nitrogen supply on the levels of leaf hypericins was examined for St. John's wort (Hypericum perforatum L.) grown in a sand culture system with artificial lighting. Increasing the light intensity illuminating St. John's wort plants from 106 to 402 mumol.m(-2).s(-1) resulted in a continuous increase in the level of leaf hypericins. Using a leaf dissection approach, the association of hypericins with the dark glands on the leaves was shown, and it was found that increasing light intensity resulted in a parallel increase in the number of dark glands. In this respect, a linear relationship was observed between leaf gland number and the level of leaf hypericins (R = 0.901). While a decrease in nitrogen supply to St. John's wort plants also yielded an increase in the level of leaf hypericins, this response occurred in a discontinuous manner over the range of nitrogen levels tested and no significant effect upon the number of dark leaf glands was observed. Overall, these effects of increased light intensity and decreased nitrogen supply on leaf hypericins appear to be independent and additive, and may reflect differences in the sites and processes where these environmental parameters impact production of these phytochemicals. (C) 2001 Editions scientifiques et medicales Elsevier SAS.