中文摘要：

以钾高效高潜基因型HG103和低效低潜基因型LG122为材料,在盆栽条件下研究了钾对不同棉花基因型叶片解剖结构的影响。结果表明,花铃期施钾条件下HG103上部叶主叶脉的上、下表皮细胞排列较LG122紧密和整齐,而下部叶片则相反;缺钾后HG103上部叶主叶脉比LG122发育得好;HG103叶脉维管束木质部具有较多导管数,利于养分和水分等的运输,而LG122木质部导管数相对较少;HG103上部叶叶脉的韧皮部比LG122较为发达,利于光合产物运输。花铃期施钾条件下HG103上部叶的叶肉细胞结构与LG122差别不大,下部叶的栅栏组织则没有LG122排列的整齐。缺钾时,HG103上部叶叶肉的上表皮细胞比LG122排列的较为整齐,栅栏组织和海绵组织形状较规则;而下部叶LG122栅栏组织和海绵组织比HG103分化得好。

英文摘要：

To study the effects of potassium（K） on leaf anatomical structures of different cotton genotypes,a pot experiment was conducted at Huazhong Agricultural University.There were two cotton genotypes（HG103,and LG122）,two K application levels（0 and 0.4 g/kg soil）.The HG103（high K efficiency genotype） and LG122（low K efficiency genotype） were selected from 86 cotton cultivars（Gossypium hirsutum L.）.The results show that the upper leaves main veins of the upper or the lower epidermis cells of HG103 are more tight and neat than those of LG122 when adding K,while the main veins of lower leaves are opposite.The upper leaf main veins of HG103 are better than those of LG122 under the no K level.HG103 has lots of vascular xylem vein catheters which benefits nutrients and moisture transportion,while LG122 has small number of xylem conduits.The phloem veins of the upper part of HG103 are better than those of LG122,which could help HG103 transport much of photosynthetic products.The structures of upper leaf mesophyll cells of HG103 and LG122 are not very different when applying K,but lower leaf palisade tissues of LG122 are more neatly arranged than those of HG103.Under the K insufficiency,upper leaf epidermal cells of HG103 are more orderly,and shapes of palisade and spongy tissues are more regular,while the palisade tissue and spongy tissue of the lower leaves of LG122 are better than those of HG103.