紫外辐射增强对4个甘蔗割手密无性系根际真菌数量和优势种群的影响

Effects of UV-B Radiation on Rhizosphere Fungi Quantity and Dominant Populations of 4 Wild Sugarcane (Saccharum spontaneum L.) Clones

摘要:

采用大田试验方法, 研究了模拟紫外辐射(UV-B, 280 nm~310 nm)增强对4个UV-B辐射敏感性不同的割手密无性系根际真菌数量和优势种群的影响。结果表明：UV-B辐射增强不改变割手密根际真菌的数量在分蘖期最大、幼苗期次之、伸长期和成熟期较少的规律性; UV-B辐射增强条件下, 割手密耐性无性系根际真菌数量显著增加, 并显著多于敏感无性系, 但UV-B辐射使割手密无性系根际真菌的优势种群组成减少, 优势种群以青霉属真菌为主。

Abstract:

Field studies were conducted for a season to determine potential for alterations in the rhizosphere fungi quantity dynamics and dominant populations of 4 wild sugarcane clones(S. spontaneum L.) with different UV-B sensitivity under an enhanced ultraviolet-B (UV-B, 280 nm~310 nm) radiation. The quantity of rhizosphere fungi was most in tillering stage, second in seedling stage and lest in elongating stage and maturing stage, the sequence wasn’t alternated by UV-B radiation. The rhizosphere fungi quantity of tolerant clone was obviously increased and greater than the sensitive clone under the enhanced UV-B radiation, however, the number of dominant populations decreased and Penicillium was the dominant population during the periods of 4 wild sugarcane clones.