Anthocyanin Influence on Water Proton NMR Relaxation Times and Water Contents in Leaves of Evergreen Woody Plants During the Winter
Anthocyanin Influence on Water Proton NMR Relaxation Times and Water Contents in Leaves of Evergreen Woody Plants During the Winter
复制标题
花青素对常绿木本植物冬季叶片水质子核磁共振弛豫时间和含水量的影响
DOI：
10.1093/oxfordjournals.pcp.a078231
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发表时间：
1992
影响因子：
4.9
通讯作者：
K. Toki
中科院分区：
文献类型：
--
作者：
S. Kaku;M. Iwaya‐Inoue;K. Toki
研究了越冬期间红色常绿叶片花色苷对水质子核磁共振弛豫时间(T1)的影响。以杜鹃、薇菜和十大功劳同一枝的红色叶和绿色叶为材料，分别测定了叶肉细胞的水分含量、花色苷含量和组织学染色部位。虽然马霍尼亚红叶的含水率下降幅度不大，但前两种红叶的降幅明显。T1红叶与绿叶差异不显著。与十大功劳相比，红叶杜鹃和紫薇叶肉中花色苷含量的增加和红色的组织学定位更为明显。这些观察结果表明，尽管叶片含水量显著下降，但前两种植物红色叶肉细胞的组织定位和红色叶片中花青素含量的显著增加有助于维持T1松弛时间。推测叶肉中红色薄壁细胞定位面积的增加比叶片中花色苷总量的增加对维持红叶中的T1水平更为有效，这似乎依赖于叶肉细胞中花青素的液泡区隔化。
An investigation was made to determine the effect of anthocyanin in red-colored evergreen leaves during the mid-winter on water proton NMR relaxation times (T1). Water contents, anthocyanincontents and histologic localization of red-coloration in mesophylls were determined by using both red-colored and green leaves from the same branches ofRhododendron, ViburnumandMahonia, respectively. Although the decrease of water contents in the red-colored leaves inMahoniawas insignificant, decreases in the former two species were clearly observable. T1differences between red-colored and green leaves for the three species were insignificant. Increases of anthocyanin contents and histologic localization of red coloration in mesophylls for the red-colored leaves were more pronounced inRhododendronandViburnumthan inMahonia. These observations suggest that the pronounced increases of histologic localization of red-colored mesophyll cells and anthocyanin contents in red-colored leaves for the former two species contribute to maintenance of T1relaxation times in spite of the marked decrease of water contents in leaves. It is assumed that the increase of localization areas of red-colored parenchymatous cells in mesophylls is more effective than the total contents of anthocyanins in leaves towards the maintenance of the T1level in red-colored leaves, and this appears to be dependent on the vacuolar compartmentation of anthocyanin in mesophyll cells.