Institute of Botany, Chinese Academy of Sciences, Beijing, China.
Plant Signal Behav. 2011 Jan;6(1):59-65. doi: 10.4161/psb.6.1.13545. Epub 2011 Jan 1.
The development of Casparian strips (CSs) on the endo- and exodermis and their chemical components in roots of three cultivars of rice (Oryza sativa) with different salt tolerance were compared using histochemistry and Fourier transform infrared (FTIR) spectroscopy. The development and deposition of suberin lamellae of CSs on the endo- and exodermis in the salt-tolerant cultivar Liaohan 109 was earlier than in the moderately tolerant cultivar Tianfeng 202 and the sensitive cultivar Nipponbare. The detection of chemical components indicated major contributions to the structure of the outer part from aliphatic suberin, lignin, and cell wall proteins and carbohydrates to the rhizodermis, exodermis, sclerenchyma, and one layer of cortical cells in series (OPR) and the endodermal Casparian strip. Moreover, the amounts of these major chemical components in the outer part of the Liaohan 109 root were higher than in Tianfeng 202 and Nipponbare, but there was no distinct difference in endodermal CSs among the three rice cultivars. The results suggest that the exodermis of the salt-tolerant cultivar Liaohan 109 functions as a barrier for resisting salt stress.
利用组织化学和傅里叶变换红外（FTIR）光谱比较了 3 个不同耐盐性水稻（Oryza sativa）品种根内、外表皮 Casparian 带（CSs）的发育及其化学组成。耐盐品种 Liaohan 109 的内、外表皮 CSs 中栓质层片的发育和沉积比中耐盐品种 Tianfeng 202 和敏感品种 Nipponbare 更早。化学组分的检测表明，脂肪栓质、木质素、细胞壁蛋白和碳水化合物对根表皮、外表皮、厚壁组织以及一系列皮层细胞（OPR）和内皮层 Casparian 带的外层结构有较大的贡献。此外，Liaohan 109 根外层中这些主要化学组分的含量高于 Tianfeng 202 和 Nipponbare，但 3 个水稻品种的内皮层 CSs 没有明显差异。结果表明，耐盐品种 Liaohan 109 的外表皮具有抵御盐胁迫的功能。
