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    <mxCell id="node2" value="策略：构建含单/双ACGT基序、间隔0/5/10/25 bp的人工启动子，Pmec最小启动子+GUS报告基因" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#d5e8d4;strokeColor=#82b366;fontSize=12;fontStyle=1;verticalAlign=middle;" vertex="1" parent="1">
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    <mxCell id="node3" value="关键改造：天然PP2C启动子（At5g59220）验证，M1/M2盒突变及ACGT区删除" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#fff2cc;strokeColor=#d6b656;fontSize=12;fontStyle=1;verticalAlign=middle;" vertex="1" parent="1">
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    <mxCell id="node4" value="结果：人工启动子（(ACGT)N5→SA诱导3倍；(ACGT)N25→ABA诱导3倍）；根最高17.22、叶14.06、种子9.63 nmol/min/mg蛋白" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#f8cecc;strokeColor=#b85450;fontSize=12;fontStyle=1;verticalAlign=middle;" vertex="1" parent="1">
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    <mxCell id="node5" value="结果：天然PP2C启动子SA诱导5.94倍；ABA诱导13.50倍。M1突变&gt;SA诱导3.02倍、ABA7.41倍；M2突变&gt;SA3.06倍、ABA13.16倍；删除ACGT区后诱导完全丧失（1.09、1.21倍）" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#f8cecc;strokeColor=#b85450;fontSize=12;fontStyle=1;verticalAlign=middle;" vertex="1" parent="1">
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    <mxCell id="node6" value="结果：基因组分析，73个启动子含(ACGT)N5(ACGT)，151个含(ACGT)N25(ACGT)，多为胁迫响应基因" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#f8cecc;strokeColor=#b85450;fontSize=12;fontStyle=1;verticalAlign=middle;" vertex="1" parent="1">
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    <mxCell id="node7" value="结论：ACGT双拷贝间隔5 bp→SA诱导；25 bp→ABA诱导。间隔长度差异招募不同bZIP转录因子（TGA/TRAB1），实现激素信号差异化调控" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#e1d5e7;strokeColor=#9673a6;fontSize=12;fontStyle=1;verticalAlign=middle;" vertex="1" parent="1">
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