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    <mxCell id="node2" value="策略：构建SR8B菌株（整合crtYB/crtI/crtE），对比葡萄糖与木糖发酵" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#d5e8d4;strokeColor=#82b366;fontSize=13;fontStyle=1;fontColor=#000000;verticalAlign=middle;align=center;" vertex="1" parent="1">
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    <mxCell id="node3" value="关键改造①：在SR8菌株中整合crtYB/crtI/crtE基因（URA3位点）" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#ffe6cc;strokeColor=#d79b00;fontSize=13;fontStyle=1;fontColor=#000000;verticalAlign=middle;align=center;" vertex="1" parent="1">
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    <mxCell id="node4" value="关键改造②：构建SR8BH（过表达tHMG1）作为对照，评估其在不同碳源下的效果" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#ffe6cc;strokeColor=#d79b00;fontSize=13;fontStyle=1;fontColor=#000000;verticalAlign=middle;align=center;" vertex="1" parent="1">
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    <mxCell id="node5" value="结果①：摇瓶发酵——木糖产96.4 mg/L，为葡萄糖的3倍（比含量13.7 vs 3.9 mg/g DCW）" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#f8cecc;strokeColor=#b85450;fontSize=13;fontStyle=1;fontColor=#000000;verticalAlign=middle;align=center;" vertex="1" parent="1">
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    <mxCell id="node6" value="结果②：机制解析——木糖上调ACS1（2.7倍）和HMG1（2.2倍），增大乙酰辅酶A池" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#f8cecc;strokeColor=#b85450;fontSize=13;fontStyle=1;fontColor=#000000;verticalAlign=middle;align=center;" vertex="1" parent="1">
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    <mxCell id="node7" value="结果③：补料分批发酵——772.8 mg/L，生产力5.4 mg/L/h，产量2.2 mg/g木糖" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#f8cecc;strokeColor=#b85450;fontSize=13;fontStyle=1;fontColor=#000000;verticalAlign=middle;align=center;" vertex="1" parent="1">
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