不同甘薯品种抗UV-B辐射增强的效应分析

用比色法研究人工增强UV-B辐射对盆栽‘滇紫甘薯24’（‘DZS24’）和‘徽薯’（‘HS’）成熟叶片渗透调节物质含量和抗氧化酶比活力的影响及其种间差异。结果表明：增强UV-B辐射下2品种的可溶性糖含量（SSC）均随辐射强度的增加而显著降低，可溶性蛋白质含量（SPC）均为前期随辐射强度的增加而降低，后期随辐射强度的增加而升高，但‘HS’的变化幅度均大于‘DZS24’，‘DZS24’的游离脯氨酸含量（FPC）随辐射强度的增加而增加，‘HS’则与其相反；2品种的超氧化物歧化酶（SOD）和过氧化氢酶（CAT）比活力随辐射强度的增加而升高，POD（过氧化物酶）比活力随辐射强度的增加而降低，但相同辐射下‘DZS24’的SOD比活力的增幅大于‘HS’，POD和CAT比活力的变幅小于‘HS’。因此‘DZS24’具有比‘HS’更强的渗透调节和抗氧化能力，更适于在UV-B辐射强烈的低纬高原地区种植。

Effect Analysis of Anti-UV-B Enhancement of Two Sweet Potato Cultivars

The effects of artificial UV-B enhancement on osmoregulation substance contents and specific activity of the antioxidant enzymes and their interspecific differences of the mature leaves of potted ‘Dianziganshu24’(‘DZS24’) and ‘Huishu’(‘HS’) were studied by using colorimetry. The results showed that: under enhanced UV-B, the soluble sugar contents (SSC) significantly reduced with the UV-B enhancement, the soluble protein contents (SPC) decreased at the earlier stage and increased at the later stage with the enhancement for two cultivars. Moreover, the variation range of SSC and SPC of ‘HS’ was larger than that in ‘DZS24’. The free proline contents (FPC) increased in ‘DZS24’ and decreased in ‘HS’ with the enhancement. The specific activity of superoxide dismutase (SOD) and catalase (CAT) increased, while the peroxidase (POD) specific activity decreased with the enhancement for the two cultivars. However, the increasing range of SOD specific activity of ‘DZS24’ was larger than ‘HS’ and the variation range of POD and CAT specific activity was less than ‘HS’ under the same UV-B. Therefore the osmotic regulation and antioxidant capacity of ‘DZS24’ is stronger than ‘HS’ and more suitable for planting in low latitude plateau with the intense UV-B.