As the drought stress duration extended, the δ 2 H value of DR leaves exhibited an increasing trend; however, there was little change from 2 h to 4 h, followed by a sharp increase from 6 h to 8 h ( Figure 2 ).
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Water Translocation and Photosynthetic Responses in Clones of Kentucky Bluegrass to Heterogeneous Water Supply.
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The sentences
Under drought stress conditions, as the duration of stress increased, the δ 2 H value of MR leaves showed a trend of first increasing, then decreasing, and finally increasing again, reaching its maximum at 8 h.