「切れこみ」の認識

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  • Measurement of leaf indentation
  • キレ コミ ノ ニンシキ

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Measurement points of leaf indentations were defined to find out any reasonable boundary between `serration' and `incision' as shown in Fig. 1A. There, l_1 is the tangent of an indentation with two contact points A and B and l_2 is another tangent parallel to l_1 with a contact point C. The depth of the indentation (H) is represented by the length of the parpendicular from C to l_1. If the foot of the parpendicular (D) comes out of the range of A and B, the depth of the indentation (H) is CA or CB whichever shorter as shown in Fig. 1B. The outermost tangents of a leaf define primary indentations AaBaCa etc., and various other indentations EFG etc. are included in each of them (Fig. 1 G, H). The rate of indentation (R) is calculated by the formula, R=H/W × 100, in which H is the depth of indentation and W is the width of leaf brade defined in Fig. 1 E, and F. Frequencies of R in various indentations of various plants (Tab. 2) were shown in Fig. 2 A and Tab. 3 where the boundary of `serration' and `incision' was found to be laid at around R=8.2. It is reasonable to define `serration' as an indentation with R<7.0 and `incision' as R≧9.0. Shallow and middle `incision' was not clearly discriminated by the value of R (Fig. 2B) but the boundary between deep `incision' and other shallow `incision' could be observed at around R=20〜25 (Fig. 2C).

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