Leaf cuticle and water loss in maize lines differing in dehydration avoidance
Leaf cuticle and water loss in maize lines differing in dehydration avoidance
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DOI：
10.1078/0176-1617-0743
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发表时间：
2002
影响因子：
4.3
通讯作者：
Z. Ristić;M. Jenks
中科院分区：
文献类型：
--
作者：
Z. Ristić;M. Jenks
摘要 植物角质层在保护植物免受水分流失方面发挥着重要作用。本研究的目的是调查两个不同脱水避免品系的玉米 (Zea mays L.) 品系 (a) 表皮失水量与表皮细胞壁厚度和角质层厚度之间的关系，以及 (b) 表皮失水量与角质层蜡质数量和成分之间的关系。通过在黑暗条件下测量枝条和脱落的叶子（叶片）的失水量来确定 16 天龄植物的表皮失水量。结果揭示了表皮水分流失与细胞壁和角质层厚度之间的反比关系。地上部和离体叶失水率较低的玉米品系 ZPBL 1304 比地上部和离体叶失水率较高的玉米品系 ZPL 389 具有更厚的表皮细胞壁和角质层。角质层蜡的量与表皮失水量并不呈负相关，这表明蜡量本身在表皮蒸腾作用中可能并不重要。因此，穿过角质层的水流可能比简单地穿过均匀脂质层的扩散更为复杂。
Summary The plant cuticle plays an important role in protecting plants against water loss. The objectives of this study were to investigate the relationships between (a) epidermal water loss and epidermal cell-wall thickness and cuticle thickness, and (b) epidermal water loss and cuticular wax quantity and composition in two lines of Zea mays L. (maize) differing in dehydration avoidance. Epidermal water loss from 16-day-old plants was determined by measuring water loss in shoots and detached leaves (leaf blades) under dark conditions. The results revealed an inverse relationship between the epidermal water loss and cell-wall and cuticle thickness. A maize line with lower rates of shoot and detached-leaf water loss, ZPBL 1304, had thicker epidermal cell wall and thicker cuticle than a maize line with higher rates of shoot and detached-leaf water loss, ZPL 389. The amount of cuticular wax did not correlate inversely with epidermal water loss, suggesting that wax quantity alone may not be important in epidermal transpiration. Water flow through the cuticle may thus be more complex than simple diffusion through a homogenous lipid layer.