植物研究2012，Vol.32Issue(4)：415-419,5.
光质、光强对入侵植物紫茎泽兰种子萌发及幼苗状态的影响
Influence of Light quality and Quantity on Germination and Seedling Status of Invasive Species Eupatorium adenophorum
摘要
Abstract
For understanding the features of light-demanding seed germination of Eupatorium adenophorum, the influences of light qualities ( different colors, red/far-infrared light) and light intensity on seedling sprouting of this weed were studied in this paper. Lights of different colors have significantly influence on the parameters of seedling sprouting, i. e. , yellow light, orange light and red light, which have longer wavelength, were more suitable for facilitating seed germination rate (74,3% -83.3%), while the shorter wavelength lights ( < 570 nm, violet, blue and green lights) had significant lower seed germination rates (62.3% -66.7%) (p<0. 05). Light intensity had markedly more regularity on seed germination and seedling status than the color of the light. Under the condition of darkness, germination rate was 22%. Along with the light enhancement both in transmit-tance and lux, exponential increases in seed germination (r2 =0. 96) and root length ( r2 =0. 98) were observed, while height of seedlings exponentially decreased (r2 =0.99) ; a linear increase in fresh mass was simultaneously observed (r2 =0.70). Appropriate radiation of red light (630 nm) and far-infrared light (730 nm) can break and cause dormancy. The exposure amount of red light linearly related with germination increase with reference to dark control (r2 =0. 98) , while the amount of far-infrared light was linearly correlated with germination decrease with reference to control ( r2 =0. 92). This indicates that light-demanding seed germination of E. adenophorum is a phytochromes-induced process. E. adenophorum generally runs rampant in barren and dis- turbed lands and light sensitive germination should be partially responsible for that. The ecological control of this weed should consider light regulation, in particular the light quality ( such as afforestation decreases red light/ far-infrared ratio) to decrease seed germination.关键词
光质/光强/红光/远红光的交替处理/种子萌发Key words
light quality/light quantity/red/far-infrared light alternating process/germination rate分类
农业科技引用本文复制引用
姜勇,王文杰,李艳红,包松莲..光质、光强对入侵植物紫茎泽兰种子萌发及幼苗状态的影响[J].植物研究,2012,32(4):415-419,5.基金项目
国家自然科学基金(31170575)和博士后基金项目(201003406&20080430126) （31170575）
