油桐抗枯萎病株系的选鉴研究

Studies on the Selection and Appraisal of Blight-disease-resistant Families of Aleurites fordii

10年研究的结果表明,油桐主要品种或类型,以及绝大多数抗病单株的自由授粉子代均不抗枯萎病。抗病单株R44⑥自交一代,R44⑥×R53⑨杂交一代显著抗病。幼苗期伤根浇菌液接种法是一种早期有效的鉴别油桐抗病性的测定方法。抗病株系的氨基酸含量明显高于感病株系,而低于对枯萎病免疫的千年桐。

Investigations conducted in the recent 10 years have showed that the major varieties or forms, as well as most of the open-pollination progenies from blight-disease-resistant parent individuals of Aleurites fordii were not tolerant to the blight disease infected by Fusarium oxysporum f. sp. aleuritidis. However, trees of the first generation from self-pollination of the resistant individual R44(6) and from crossbreeding of R44(6) x R53(9) were found to possess an evident resistance to the disease. The early effective examination of the disease resistance was conducted by inoculation through application of the fungus suspension to wounded roots at the young seedling stage. It was also found that the content of amino acid in resistant trees was significantly higher than that in the susceptive ones, but lower than that in A. montana trees, which are immune from the wilt disease.