【摘要】 以1a年生‘金丝小枣’嫁接苗为试材,研究了盆栽条件下硅对其盐胁迫下叶的超微结构的影响。结果表明,随着盐浓度胁迫的增加,‘金丝小枣’叶绿体膨胀,类囊体片层扭曲、变形、松散,淀粉粒减少、消失,嗜锇颗粒减小、变为空腔,膜逐渐解体。盐胁迫下加硅减轻了盐胁迫对‘金丝小枣’细胞超微结构的伤害,主要表现是叶绿体片层结构得到了较好的保持,维护了膜系统结构的正常与完整,延缓了叶绿体的衰老、解体。同时,盐胁迫下加硅‘金丝小枣’叶片中的淀粉粒、和嗜锇颗粒增多,而且结果也表明施0.5‰低浓度的硅要比施1.0‰浓度的硅效果明显著。更多还原

【Abstract】 Effects of silicon on ultrastructure in leaves of Zizyphus jujube cv. ‘Jinsi-xiaozao’ of 1-year-grafted seedings under salt stress were studied. The experimental results showed that,with the increase of salt concentration, the chloroplast of Zizyphus jujube ‘Jinsi-xiaozao’, expanded, the slices of basal granule were distorted or even disintegrated, matrix was tenuity, the starch particles disappeared, plastoglobulis became empty, and the membrane of chloroplast became disintegrated. Application of silicon could hold the stability and integrity of ultrastructure of membrane system under salt stress, suppressing aging of chloroplast and desintegrity of the lamellae. Silicon also increased the production of osmiophilic granule, starch grain. The experimental results also showed that the effects of 0.5‰ silicon were more distinct than 1.0‰ silicon.更多还原