Dinitropheol exerted its effect on sucrose uptake or secretion into the sieve tubes.

二硝基酚影响蔗糖的吸收或者分化到筛管里。

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Hence the conducting sieve tubes do not necessarily be cut off at the usual cut - ting depth required.

因此，按规定的深度割胶，并不直接切断有功能的筛管。

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