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

在24℃的低温条件下，辣椒y-2植株的叶片形态发生了异常。这种异常的触发似乎是水杨酸在植物中的诱导作用，该化合物诱导病原体相关蛋白的活跃表达。基于“sy2”在恒温地区（24-26℃）生长会诱发病毒等病原的抗性的假设，我们在热带恒温国家印度尼西亚栽培了“sy2”。与假设相反，“Sy-2”植株像对照品种一样感染了病毒。然而，在印度尼西亚种植的一些传统品种和‘ Sy-2 ’中，观察到病毒感染的植株产生新芽。对sy2型病原菌耐药的温度传感评价还需要较长时间的观察。在这个项目中，我们还收集了来自印度尼西亚和加勒比地区的许多品种，并发现了一个辣椒品种（capsicum chinense）具有有趣的温度响应表型，如‘ Sy-2 ’。该品种形态的遗传机制似乎与“Sy-2”相似。我们应该详细分析这种有趣的表型，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.