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黄足黄守瓜先用口器在黄瓜幼苗叶面划圈,然后再取食圈内叶组织,但黄足黄守瓜却直接取食离体黄瓜子叶,而不发生划圈取食行为.研究显示,黄守瓜这一有趣的划圈取食行为和黄瓜的化学应答显著相关.当黄瓜被黄守瓜取食后,子叶中葫芦素C的含量在60min内增加10倍以上,15min后子叶还出现葫芦素Ⅰ,并在60min内达到75mg/g鲜重的水平,而且黄瓜子叶中这一高水平的葫芦素至少要持续24h.进一步的实验证实,葫芦素C在10~250mg/g浓度范围刺激黄守瓜取食,250mg/g以上浓度则抑制黄守瓜取食;而葫芦素Ⅰ在50mg/g浓度就抑制黄守瓜取食,尤其是和葫芦素C混合后,对黄守瓜取食的抑制效应显著增加.结果表明,黄瓜通过增加葫芦素种类和浓度以避免被黄守瓜进一步侵食,而黄守瓜为了应对黄瓜的这一化学响应机制,采用先划圈阻断黄瓜圈内叶组织合成葫芦素和使圈外葫芦素不能迁移到圈内,以保证能取食圈内叶组织.黄守瓜的取食行为和黄瓜的化学应答是它们为生存而形成的一种巧妙的自我保护策略.
Yellow foot yellow Shougua first mouthpart cucumber seedling leaf surface circle, and then take the inner loop of the leaf tissue, but the Yellow foot yellow cucumber but directly fed cucumber cotyledons, without the occurrence of cross-ring feeding behavior.Studies show that Huang Shougua This interesting circling feeding behavior is significantly related to the chemical response of cucumber.When the cucumber was fed on yellow cucumber, the content of cucurbitacin C in the cotyledons increased more than 10 times in 60 minutes, and the cucurbitacin Ⅰ appeared in the cotyledon after 15 minutes Reached the level of 75mg / g fresh weight in 60min, and cucumber cotyledons in this high level of cucurbitacin at least for 24h. Further experiments confirmed that cucurbitacin C in the range of 10 ~ 250mg / g stimulated Huang Shougua feeding, 250mg / g above the concentration inhibited the yellow Shougua feeding; and cucurbitacin Ⅰ at 50mg / g concentration inhibited yellow Shougua feeding, especially with cucurbitacin C, the inhibitory effect on yellow Shougua feeding increased significantly.The results show that cucumber by increasing Cucurbitacin variety and concentration in order to avoid yellow Shougua further intrusion, and Huang Shouguai cucumber in response to this chemical response mechanism, the first circle of cucumber cucumber ring blocking the synthesis of cucurbitacin and cucurbitacin outside the circle can not migrate to the ring To guarantee feeding circle leaf tissue. Cucurbit feeding behavior and biochemical response of cucumber is a clever self-protection strategies for survival they formed.