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The objectives of this study was to clarify the level of resistance to Puccinia melanocephala and the distribution of Bru1 in sugarcane wild germplasm collections. Resistance of 31 wild core germplasm from National Nursery of Sugarcane Germplasm Resources (NNSGR, Kaiyuan, China) was identified at seedling stage, and the resistance gene Bru1 was detected in 2013. The results showed that 28 out of 31 materials (90.3%) were highly resistant (Grade 1) or moderately resistant (Grade 3). Of them, nineteen (61.3%) were highly resistant (Grade 1), three (9.7%) were resistant (Grade 2) and six (19.4%) were moderately resistant. Bru1 was detected in eight (25.8%) resistant materials . The absence of Bru1 in other 20 resistant and three susceptible entries suggests they may contain brown rust resistance-associated genes other than Bru1. Therefore the elite brown rust resistance gene should be contained in numerous sugarcane wild core germplasm collections of NNSGR, and be valuable for future brown rust resistant breeding programs in sugarcane.

摘 要: 以籼粳交超级稻甬优 12 为试材、四叶一心期带蘖小苗移栽, 超稀植(12.45×10 4 穴 hm -2 )栽培, 对高产 (10.5~12.0 t hm -2 )、更高产(12.0~13.5 t hm -2 )、超高产(>13.5 t hm -2 ) 3 个产量群体的产量及其结构、茎蘖动态、叶面 积动态及干物质的积累与运转等进行了系统比较研究。结果表明, 产量由高产(10.5~12.0 t hm -2 )到更高产(12.0~13.5 t hm -2 )再到超高产(>13.5 t hm -2 ), 群体的颖花量不断提高, 结实率和千粒重略微下降。与高产和更高产群体相比, 超高

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