Structural difference between leaf blade and petiole of original and mulched leaf litter of Ginkgo biloba
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概要
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Lignin structural differences in leaf blade and petiole tissue from original and mulched leaf litter of G. biloba were analyzed. The total yield of neutral sugar in petiole was higher compared to that of leaf blade in both original and mulched samples. Lignin content obtained by an acetyl bromide procedure in petiole gave similar values to Klason lignin content corrected by subtracting the protein content. Total yields of alkaline nitrobenzene oxidation and ozonation products based on Klason residue and acetyl bromide lignin were lower compared to wood samples, while the yield based on assumed lignin content coincided with the value from wood samples. These results revealed that the Klason method and acetyl bromide procedure overestimated the value for the lignin content of leaves. The accurate content of lignin can be estimated from the methoxyl content of the Klason residue落葉のマルチング過程における化学成分の動態を詳しく見るためには，葉の組織ごとの化学成分の違いを考慮する必要がある。そこで，イチョウ落葉とそのマルチング処理物を，葉片と葉柄に分けて成分分析を行い，マルチングによる変化を調べた。細胞壁多糖の中性糖総量は葉片に比べ葉柄のほうが多かった。リグニンについて，Klason 法に加えてアセチルブロミド法によって直接測定するとともに，メトキシル基量をもとに推定値を求めた。葉柄ではKlason 残渣量をタンパク質について補正するとアセチルブロミド法の値とほぼ一致し，高いKlason 残渣量はタンパク質の混入によることが明らかとなった。しかし，葉片についてはKlason 残渣にタンパク質以外の成分が大量に混入していた。Klason 残渣およびアセチルブロミドリグニンをベースとした葉片のニトロベンゼン酸化生成物量およびオゾン酸化によるリグニン由来の生成物も極めて少なかった。メトキシル基量をもとに計算したリグニン量推定値をベースとしたそれらの収率は葉片および葉柄ともに木粉のそれと一致する値が得られた。Klason 法およびアセチルブロミド法は葉，特に木質化してない葉片のリグニン含有量を過大評価することが明らかになった。
著者
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Matsumoto Yuji
Graduate School Of Agricultural And Life Sciences The University Of Tokyo
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Jin Zhenfu
Graduate School Of Agricultural And Life Sciences The University Of Tokyo
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Shao Shunliu
Institute Of Ecology Zhejiang Forestry Academy
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Iiyama Kenji
Japan International Research Center For Agricultural Science (jircas)
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