25℃ gene switch: Solanaceae plants in tropical area, which control their growth and development responding to small temperature difference

辣椒‘Sy-2’植株在24℃下生长时，叶片出现异常形态。异常的触发似乎是植物中的水杨酸诱导，并且该化合物诱导病原体相关蛋白的主动表达。根据“Sy-2”在恒温区（24-26℃）生长会诱导病原体如病毒等产生抗性的假设，我们在印度尼西亚这个热带国家恒温栽培了“Sy-2”。与假设相反，'Sy-2'植株像对照品种一样被病毒感染。然而，在一些传统的品种和'Sy-2'在印度尼西亚生长，芽代从病毒感染的植物进行了观察。对‘Sy-2’的温度敏感性进行抗病性评价还需要较长时间的观察。在本项目中，我们还收集了来自印度尼西亚和加勒比地区的许多辣椒品种，并发现了一个辣椒品种（Capsicum chinense），具有类似'Sy-2'的温度反应感兴趣的表型。该品种的形态遗传机制与'Sy-2'相似。我们应该详细分析感兴趣的表型，并考虑如何利用热带地区的生物资源。

When ‘Sy-2’ (Capsicum chinense) plants are grown under 24℃, the abnormal morphology in their leaves are observed. The trigger for the abnormality seemed to be salicylic acid induction in the plants and the compound induces the active expression of pathogen-related proteins. On the basis of the hypothesis that the growth of ‘Sy-2’ at areas with a constant temperature (24-26℃) will induces pathogen, such as such as viruses, resistance, we cultivated ‘Sy-2’ in Indonesia, tropical country with constanttemperature. On the contrary of the hypothesis, ‘Sy-2’ plants were infected with viruses like control cultivars. However, in some traditional cultivars and ‘Sy-2’ grown in Indonesia, shoots generation from virus infected plants were observed. Longer-time observation should be needed for the evaluation of temperature sensing for pathogen resistance of ‘Sy-2’. In this project, we also collected many cultivars from Indonesia and Caribbean community and found a capsicum cultivar (Capsicum chinense) with the interesting phenotype for temperature response like ‘Sy-2’. The genetic mechanisms for the morphology of the cultivar seemed to be similar to ‘Sy-2’. We should analyze the interesting phenotype in detail and consider how to use the bio-resources in tropical area.