论文部分内容阅读
利用柑桔不同品种的同样器官或同一品种同一株上不同部位以及不同发育时期的器官,作表皮組織結构的比較观察,証明气孔的形成及发育状态与柑桔潰瘍病的自然侵染(即非伤損侵染)有密切的关系。当柑桔枝梢生长到伸长停止期,枝叶上的表皮气孔的形成量为最大,此时达到最大的侵染,当枝梢停止生长后,枝叶表皮組織不再形成新气孔,原有气孔已漸老熟,此时便进入侵染的末期。徒长性枝梢的生长期較长,延迟了伸长的停止期,頂端不断形成新組織,而下部的組織已形成气孔,因此枝梢下部生长較久的茎叶先得病,而其頂部組織不受侵。果实的生长期甚长。在5月底至6月間果实的增长最快,形成气孔最多,故不断受侵染。当幼果生长60天左右,果实趋于定形,原有气孔已老熟,从此便絕少侵染。在器官上大量气孔形成时期如遇天旱,侵染便因病原菌的限制而減低或避免;如遇多雨时,侵染期可以延长。气孔分布最密的組織或器官最易侵染。品种間的抗病性亦与此有关,例如各器官的表皮气孔密度及气孔中隙的尺度均以甜橙为最高,順次为酸橙、檸檬及枳壳等。不产生气孔的表皮組織例如叶片的上表面不易受侵。伤損及人工接种可以使任何气孔形成时期受侵,說明突破表皮时便失去抗病力。但在自然情况下虫伤及其他損伤极易栓化,故影响不大。
The observation of epidermal tissue structure by using the same organs of different varieties of the same citrus or different parts of the same strain on the same strain and organs at different development stages shows that the formation and development of stoma and the natural infection of citrus canker Injury infection) are closely related. When the citrus shoots grow to the extension of elongation, the amount of epidermal stomatal formation on the branches and leaves is the largest, at this time, the maximum infection is reached. When the shoots stop growing, the new stomata are no longer formed in the epidermal branches of the branches and leaves, Has become mature, then enter the end of the infection. Prolonged vegetative shoots grow longer, delay the elongation of the suspension period, the top of the continuous formation of new tissue, while the lower part of the organization has formed stomatal, so the shoots grew longer stems and leaves get sick earlier, and its top tissue is not Invaded. The fruit grows very long. In the end of May to June the fastest growing fruit, the formation of stomatal up, it continues to be infected. When the young fruit grow about 60 days, the fruit tends to shape, the original stomata have been cooked, then rarely infested. In the case of a large number of organ stomatal formation in case of drought, the infection will be reduced or avoided due to pathogenic bacteria; In case of rain, the infection period can be extended. Most stomatal distribution of the most vulnerable tissues or organs infected. Disease resistance between varieties also related to this, such as the epidermal stomatal density of each organ and stomata in the scale of the highest orange, followed by lime, lemon and Citrus aurantium and so on. Epidermal tissues that do not produce stomata, such as the upper surface of the leaf, are not easily invaded. Injuries and artificial inoculations can invade any stage of stomatal formation, indicating loss of disease resistance when the epidermis breaks through. However, in natural conditions, insect pests and other injuries can easily be tied, so little effect.