Cadmium induces premature xylogenesis in barley roots
Cadmium induces premature xylogenesis in barley roots
复制标题
DOI：
10.1007/s11104-006-9111-6
复制
发表时间：
2007-01-01
期刊：
影响因子：
4.9
通讯作者：
Tamas, Ladislav
中科院分区：
文献类型：
--
作者：
Durcekova, Katarina;Huttova, Jana;Tamas, Ladislav
分析了Cd对大麦根系H2O2产量、过氧化物酶（POD）活性和根毛形成的影响。Cd在根尖后0- 6mm的根区引起强烈的H2O2爆发。Cd处理后，POD活性在根尖处被激活，并向根基部升高。原位分析表明，H2O2产量和POD活性的升高都局限于早期的木质部维管束。Cd诱导根尖后2 ~ 4mm区域的根毛形成，这在对照根中没有发现。这些结果表明，cd诱导的根生长抑制至少部分是cd刺激的根过早发育的结果，包括木质发生和根毛形成，这与根伸长区缩短有关，因此与根生长减少有关。
The effect of Cd on H2O2 production, peroxidase (POD) activity and root hair formation were analyzed in barley root. Cd causes a strong H2O2 burst in the root region 0-6 mm behind the root tip. POD activity was activated in root tip and raised toward the root base in Cd treated roots. In situ analyses showed that both elevated H2O2 production and POD activity are localized in the early metaxylem vascular bundles. Cd induces root hair formation in the region 2 to 4 mm behind the root tip that was not detected in control roots. These results suggest that Cd-induced root growth inhibition is at least partially the consequence of Cd-stimulated premature root development involving xylogenesis and root hair formation, which is correlated with shortening of root elongation zone and therefore with root growth reduction.