So can the movement of aphids when, having depleted the young leaves on one food plant, their offspring then fly onward to a different host plant, with no one aphid ever returning to where it started.
2
生长素主要是从旺盛生长新梢上正在发育的幼叶产生出来。
Auxins are produced mainly by young developing leaves on actively growing shoots.
3
试验结果表明：幼叶与茎尖是蝴蝶兰原球茎诱导的较佳外植体；
The results showed that young leaves and shoot-tips are the best explants for PLB induction.
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