钙对水稻苗期光合特性影响及其亚细胞分布（英文）

Study on Effects of Calcium on Photosynthetic Characteristics and Its Subcellular Distribution in Rice at Seeding Stage

为了探明钙对水稻苗期光合特性影响及其在亚细胞分布的分布规律,选用高糙米钙含量品种和低糙米钙含量品种为试验材料,采用水培方法研究了钙对水稻苗期光合特性的影响及其在水稻不同类型品种中的亚细胞分布。结果表明,高钙品种的叶片净光合速率明显强于低钙品种。水稻叶片中钙含量大于根系中钙含量。在各重要细胞器组分中,钙分布表现为细胞壁>核糖体及细胞内可溶物>质体(或叶绿体)>线粒体>细胞核,细胞壁是钙最主要分布场所,细胞核、线粒体中分布较少。各细胞器中钙含量随钙处理浓度升高而增加,高钙品种表现更为明显。高钙处理对高钙品种各重要细胞器钙增加明显,推测高钙品种表现出更强的积累钙和耐受高钙胁迫能力。

Using the cultivars with high and low calcium in brown rice as tested ma- terials, the effects of calcium on photosynthetic characteristics and its subcellular dis- tribution in different rice cultivars at seedling stage were investigated with hydrocul- ture method. The results showed that the photosynthetic rate in leaves of high cal- cium cultivar was higher than that low calcium cultivar. The calcium content in leaves of rice was higher than that in roots. Among various tissues and organs, the calcium contents ranked as cell wall〉ribosome and intracellular soluble components〉 plastid （or chloroplasts）〉mitochondria〉nucleus. Cell wall is the most important distri- bution place for calcium, while calcium is rarely distributed in nuclei or mitochon- drias. In all the organelles, the calcium concentrations were all increased with the increased treatment concentration of calcium, especially in high calcium cultivar. The high calcium treatment showed more significant effects on calcium contents in im- portant organelles of high calcium cultivar, so it is speculated that the high calcium cultivar had higher calcium accumulation and tolerance capacities.