中国生态农业学报2016，Vol.24Issue(6)：770-779,10.DOI:10.13930/j.cnki.cjea.151229
不同马铃薯品种(系)对增强UV-B辐射的形态响应
Morphological responses of potato varieties (lines) to enhanced UV-B radiation
摘要
Abstract
UV-B radiation has a profound effect on plant morphogenesis, inevitably affecting potato cultivation, especially with enhanced UV-B radiation on the earth's surface. Compared with rice, wheat, corn and other crops, the total effect of UV-B radiation on potato is still not conclusive, especially the morphological response of potato to UV-B radiation. In this study, the effect of enhanced UV-B radiation on plant height, internode length, leaf area, root to shoot ratio (R/T) and other morphological indices of 7 potato varieties (lines) were analyzed and compared. The determination of the inter-variety variations in response was critical for the evaluation of the effect of UV-B radiation on potato. It was also important for providing further understanding on the tolerance and sensitivity of different varieties of potato to enhanced UV-B radiation. An outdoor pot culture experiment was conducted to evaluate the sensitivity of 7 potato varieties (lines), 3 colored-tuber and 4 achromatic-tuber, to a range of UV-B radiation levels. Three biologically effective UV-B radiation treatments — 0 (control), 2.5 kJ.m-2.d-1 (T1) and 5.0 kJ.m-2.d-1(T2) — were imposed on the potato varieties for 50 d when seedlings were over 20 cm high. Aboveground morphological indices were measured after 15 d, 30 d and 45 d of treatment, respectively. Response index (RI) and cumulative stress response index (CSRI) were eventually used to evaluate the sensitivity of the different varieties (lines) of potato to the UV-B radiations. The results showed that plant height, internode and leaf area of most of the treated varieties (lines) decreased consistently under enhanced UV-B radiation. The inhibitory effect of UV-B radiation on potato was more obvious under higher UV-B dose with longer duration. While a significant variability of morphological response was observed, the degree of sensitivity to UV-B radiation also varied among the potato varieties. Compared with colored-tuber varieties (lines), achromatic-tuber varieties (lines) were inhibited more severe under elevated UV-B radiation, with more evident reduction in aboveground biomass. For example, the shoot fresh weight response index of 'Hezuo 88' was-60.28 and-70.44 (negative), respectively, while that of colored-tuber 'Zhuanxinwu' was 107.75 and 21.4 (positive) under T1 and T2, respectively. Due to the negative effect of enhanced UV-B radiation on aboveground biomass, root biomass also dropped significantly for most of the potato varieties (lines). Compared with belowground root and tuber, the inhibition of aboveground biomass increased with increasing exposure to enhanced UV-B radiation. Thus, R/T of all the potato varieties (lines) obviously increased, especially at high UV-B radiation (T2). Based on the calculated CSRI, achromatic-tube varieties (lines) ('Hezuo 88' and 'Lishu 6') were sensitive to UV-B radiation, while colored-tube varieties ('Zhuanxinwu' and '21-1') more tolerant to UV-B radiation. The results suggested that the biomass of both shoot and root and tuber color were important indicators in selecting or developing UV-B radiation tolerant potato varieties.关键词
UV-B辐射/马铃薯/形态响应/彩色品种/非彩色品种Key words
UV-B radiation/Potato/Morphological response/Colored-tube variety/Achromatic-tube variety分类
农业科技引用本文复制引用
李俊,牛金文,杨芳,肖继坪,郭华春..不同马铃薯品种(系)对增强UV-B辐射的形态响应[J].中国生态农业学报,2016,24(6):770-779,10.基金项目
国家自然科学基金项目(31260342)、国家马铃薯产业体系(CARS-10-P21)和云南省马铃薯种业重大专项(2013ZA007)资助 This work was supported by the National Natural Science Foundation of China (No. 31260342), the National Potato Industry Technology System (No. CARS-10-P21) and the Major Projects of Yunnan Potato Seed Industry (No. 2013ZA007). （31260342）
