Fast upward propagation of the wound signal that systemically elevates phosphatidic acid |
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Authors: | Sumin Lee Bokhee Choi Min Sung Kim Youngsook Lee |
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Institution: | (1) Division of Molecular Life Sciences, Pohang University of Science and Technology, 790-784 Pohang, Korea |
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Abstract: | Phosphatidic acid (PA) increases in response to wounding at the neighboring unwounded leaf as well as at the wounded leaf
of many plants (Lee et al., 1997). This indicates that a signal propagates from the wounded leaf to its neighboring leaves.
In this paper, we report the speed and direction of propagation for a systemic wound signal that elevates PA. When a leaf
of a soybean (Glycine max) seedling at the 2-leaf-stage was wounded, the PA level of the neighboring leaf did not change within
the first min, but did increase significantly in 2 min, returning to the control level after 15 min. This implies that the
systemic wound signal was generated at least within 2 min of wounding, and was propagated at a speed of at least 10–16 mm/min.
When we wounded individual leaves of soybean and tobacco (Nicotiana tabaccum) seedlings that had 3 or 4 leaves, PA levels
were elevated only in the younger leaves located above the wounded leaf, but not in the older, lower leaves. Thus, the PA-elevating
wound signal preferentially moves upward in these plants. |
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Keywords: | Glycine max Nicotiana tabaccum phosphatidic acid systemic wound signal propagation |
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