Exogenous SPD influenced the photosynthetic physiological indicators in drought-stressed leaves The photosynthetic rate of leaves in the control treatment was maintained at approximately 12 μmol · m -2 -s -1 ( Figure 3A ) with an overall trend of decreasing photosynthetic rate as the degree and duration of drought stress increased.
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Exogenous spermidine improved drought tolerance in <i>Ilex verticillata</i> seedlings.
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