In this study, we investigated the effect of different types of light and MeJA treatment on the accumulation of betulin and oleanolic acid in various organs of white birch. Our results showed that betulin and oleanoli...In this study, we investigated the effect of different types of light and MeJA treatment on the accumulation of betulin and oleanolic acid in various organs of white birch. Our results showed that betulin and oleanolic were accumulated mainly in the stalk skin. The content of both substances in the stalk skin was significantly affected by seasons with a peak accumulation in August. The content of oleanolic and betulin was significantly decreased in the stem skin treated with 4 types of light (red, yellow, blue and green) compared with the plant with normal illumination. In contrast, oleanolic acid in leaves was increased by 13.28 folds when the white birch was treated with green light. Betulin was increased by 1.959 folds in leaves of white birch treated with blue light. The highest content of betulin and oleanolic acid in various organs of birch with appropriate shading treatment (light transmittance: 50%) was increased by 45.09% and 30.50%, respectively, in comparison with those with non-shading treatment. Content of oleanolic acid and betulin can be significantly improved in various parts of birch after treatment with different concentration of MeJA. The study lays the foundation to metabolic regulation of oleanolic acid and betulin in birch.展开更多
白桦（Betula platyphylla）是我国北方的乡土树种，主要分布在东北、华北、西北。由于白桦材质优良、材色洁白、表面光滑，是人造板材的优质原材料，在林业生产上具有重要经济价值。但在白桦天然次生林和人工林培育中常常遭受各种害虫...白桦（Betula platyphylla）是我国北方的乡土树种，主要分布在东北、华北、西北。由于白桦材质优良、材色洁白、表面光滑，是人造板材的优质原材料，在林业生产上具有重要经济价值。但在白桦天然次生林和人工林培育中常常遭受各种害虫的危害，降低了其材积生长和木材质量，影响木材的利用率，给林业经济造成巨大损失。以往对白桦害虫的控制措施多采用化学防治手段，不仅造成环境污染、杀伤天敌、破坏生物多样性和生态平衡，同时导致害虫产生抗药性和防治效果下降。利用基因工程的方法，将杀虫基因导入白桦，使其获得持久、稳定的抗虫性能，是害虫生物防治的新途径之一（Katia et al．，1993；张锐等，2001；程业明等，2001；金风，2004）。本文以作者转化的抗虫基因白桦为材料（王志英等，2005），对舞毒蛾幼虫生长发育的影响和抗虫性进行了测定，目的是为抗虫白桦苗木定向培育奠定科学基础。展开更多
Five wood rot fungi were used to decay 300 mature trees of white birch(Betula platyphylla)in Liangshui experiment stations.The decaying susceptible and resistant populations in 10 trees each with the highest and lowes...Five wood rot fungi were used to decay 300 mature trees of white birch(Betula platyphylla)in Liangshui experiment stations.The decaying susceptible and resistant populations in 10 trees each with the highest and lowest weight loss were selected,in which total phenol in wood was tested.The result showed that the birch wood with lower total phenol was easy to be decayed by Fomes fomentarius and Piptoporus betulinus;Irpex lacteus,Pholiota adiposa and Coriolus versicolor were not sensitive to total phenol in white birch wood.After GC-MS test to methanol extractionof white birch wood,6 organic compounds were found.This paper would provide some useful information in future study difference in the chemical characteristics of the wood between decaying susceptible and resistant populations,and select natural anti-decadent plants.展开更多
文摘In this study, we investigated the effect of different types of light and MeJA treatment on the accumulation of betulin and oleanolic acid in various organs of white birch. Our results showed that betulin and oleanolic were accumulated mainly in the stalk skin. The content of both substances in the stalk skin was significantly affected by seasons with a peak accumulation in August. The content of oleanolic and betulin was significantly decreased in the stem skin treated with 4 types of light (red, yellow, blue and green) compared with the plant with normal illumination. In contrast, oleanolic acid in leaves was increased by 13.28 folds when the white birch was treated with green light. Betulin was increased by 1.959 folds in leaves of white birch treated with blue light. The highest content of betulin and oleanolic acid in various organs of birch with appropriate shading treatment (light transmittance: 50%) was increased by 45.09% and 30.50%, respectively, in comparison with those with non-shading treatment. Content of oleanolic acid and betulin can be significantly improved in various parts of birch after treatment with different concentration of MeJA. The study lays the foundation to metabolic regulation of oleanolic acid and betulin in birch.
文摘白桦（Betula platyphylla）是我国北方的乡土树种，主要分布在东北、华北、西北。由于白桦材质优良、材色洁白、表面光滑，是人造板材的优质原材料，在林业生产上具有重要经济价值。但在白桦天然次生林和人工林培育中常常遭受各种害虫的危害，降低了其材积生长和木材质量，影响木材的利用率，给林业经济造成巨大损失。以往对白桦害虫的控制措施多采用化学防治手段，不仅造成环境污染、杀伤天敌、破坏生物多样性和生态平衡，同时导致害虫产生抗药性和防治效果下降。利用基因工程的方法，将杀虫基因导入白桦，使其获得持久、稳定的抗虫性能，是害虫生物防治的新途径之一（Katia et al．，1993；张锐等，2001；程业明等，2001；金风，2004）。本文以作者转化的抗虫基因白桦为材料（王志英等，2005），对舞毒蛾幼虫生长发育的影响和抗虫性进行了测定，目的是为抗虫白桦苗木定向培育奠定科学基础。
文摘Five wood rot fungi were used to decay 300 mature trees of white birch(Betula platyphylla)in Liangshui experiment stations.The decaying susceptible and resistant populations in 10 trees each with the highest and lowest weight loss were selected,in which total phenol in wood was tested.The result showed that the birch wood with lower total phenol was easy to be decayed by Fomes fomentarius and Piptoporus betulinus;Irpex lacteus,Pholiota adiposa and Coriolus versicolor were not sensitive to total phenol in white birch wood.After GC-MS test to methanol extractionof white birch wood,6 organic compounds were found.This paper would provide some useful information in future study difference in the chemical characteristics of the wood between decaying susceptible and resistant populations,and select natural anti-decadent plants.
