The microscopical observation and karyoltype analysis of embryo root celfs of healthy Xingkai Lake pine and Xingkai Lake pine infected by Cronartium quercuum were conducted. The results showed that the dividing phase ...The microscopical observation and karyoltype analysis of embryo root celfs of healthy Xingkai Lake pine and Xingkai Lake pine infected by Cronartium quercuum were conducted. The results showed that the dividing phase of embryo root cells decreased and the viscidity of cells in dividing phase increased when Xingkai Lake pine was infected by C, quercuum. The karyoltype changed from the contract 4A to 4B, but the number of cell chromosome and karyoltype component did not change.展开更多
The xingkai Lake pine(Pinus lakahasii Nakai) gall rust caused by Cronartiumquereuum(Berk.)Miyabe:Shirai is a serious stem rust in the northeast region of China.The alternatehost is oak (Quercus mongolica Fisch).Germin...The xingkai Lake pine(Pinus lakahasii Nakai) gall rust caused by Cronartiumquereuum(Berk.)Miyabe:Shirai is a serious stem rust in the northeast region of China.The alternatehost is oak (Quercus mongolica Fisch).Germination of both acciospores and urediospores wasoptimal at 12℃ and occurred over a range of temperatures,from 4℃ to 32℃.Teliosperes germinatedoptimally at 16--18℃ and over a range of 8--28℃.All spores germinated best under natural light anddark conditions.Direct light inhibited germination eren when followed by darkness.The incubauonperiods of urediospores and teliospores in inoculation experiments were 6--16 days and 3--33daysrespectively. Anatomical studies of Cribartium quercuum galls showed that rust hyphae freely ramify throughthe intereellular spaces within parenchymatous lissues of the cortex,phloem,cambium,and xylemHyphac are perennial;largc haustoria are cylindrical with rounded or blunt ends. Among the 12 fungieides tested for control the rust,pine-tar,pine-tar;diesel oil(1:1。展开更多
文摘The microscopical observation and karyoltype analysis of embryo root celfs of healthy Xingkai Lake pine and Xingkai Lake pine infected by Cronartium quercuum were conducted. The results showed that the dividing phase of embryo root cells decreased and the viscidity of cells in dividing phase increased when Xingkai Lake pine was infected by C, quercuum. The karyoltype changed from the contract 4A to 4B, but the number of cell chromosome and karyoltype component did not change.
文摘The xingkai Lake pine(Pinus lakahasii Nakai) gall rust caused by Cronartiumquereuum(Berk.)Miyabe:Shirai is a serious stem rust in the northeast region of China.The alternatehost is oak (Quercus mongolica Fisch).Germination of both acciospores and urediospores wasoptimal at 12℃ and occurred over a range of temperatures,from 4℃ to 32℃.Teliosperes germinatedoptimally at 16--18℃ and over a range of 8--28℃.All spores germinated best under natural light anddark conditions.Direct light inhibited germination eren when followed by darkness.The incubauonperiods of urediospores and teliospores in inoculation experiments were 6--16 days and 3--33daysrespectively. Anatomical studies of Cribartium quercuum galls showed that rust hyphae freely ramify throughthe intereellular spaces within parenchymatous lissues of the cortex,phloem,cambium,and xylemHyphac are perennial;largc haustoria are cylindrical with rounded or blunt ends. Among the 12 fungieides tested for control the rust,pine-tar,pine-tar;diesel oil(1:1。
