关键词:甘蔗; 野生核心种质; 抗褐锈病基因 Bru1; 分子检测 Identification of Resistance to Brown Rust and Molecular Detection of Bru1 Gene in 31 Wild Core Sugarcane Germplasms LI Wen-Feng, WANG Xiao-Yan, HUANG Ying-Kun*, ZHANG Rong-Yue, SHAN Hong-Li, YIN Jiong, LUO Zhi-Ming Sugarcane Research Institute, Yunnan Academy of Agricultural Sciences / Yunnan Province Key Laboratory of Sugarcane Genetic Improvement, Kaiyuan 616699, China
AbstractThe 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 (Guizhou 78-2-12, Yunnan 97-4, E. rockii 95-19, E. rockii 95-20, Yunnan 83-224, Guangxi 79-8, Yunnan 95-35, and Guangxi 89-13). The absence of Bru1in 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.
Keyword:Sugarcane; Wild core germplasm; Brown rust resistance gene Bru1; Molecular detection Show Figures Show Figures
表1 甘蔗褐锈病抗病性鉴定评价标准 Table 1 Identification standard of sugarcane resistance to brown rust disease
分级标准 Grade
抗病性 Resistance
叶片侵染状况 Leaf infection performance
1
高抗 High resistance
无症状。 No symptoms.
2
抗病 Resistance
有坏死斑, 病斑占叶面积10%以下。 The area of necrotic spots on leaves is lower than 10%.
3
中抗 Moderate resistance
植株上有一些孢子堆, 病斑占叶面积11%~25%。 There are piles of spores visible on the plant. The percentages of disease spots’ area to leaf area are 11%-25%.
4
中感 Moderate susceptibility
上层1~3片叶有一些孢子堆, 同时下层叶有许多孢子堆, 病斑占叶面积26%~35%。 There are some spore piles from leaf 1 to leaf 3 at the top and many spores on lower leaves. The percentages of disease spots’ area in leaf are 26%-35%.
5
感病1 Susceptibility 1
上层1~3片叶有极多孢子堆, 同时下层叶有轻微的坏死, 病斑占叶面积36%~50%。 There are abundant spore piles from leaf 1 to leaf 3 at the top and slight necrotic spots on lower leaves. The percentages of disease spots’ area in leaf are 36%-50%.
6
感病2 Susceptibility 2
上层1~3片叶有极多孢子堆且下层叶有比第5级更多的坏死, 病斑占叶面积51%~60%。 There are abundant spore piles from leaf 1 to leaf 3 at the top and more necrotic spots on lower leaves than these of plants at grade 5. The percentages of disease spots’ area in leaf are 51%-60%.
7
感病3 Susceptibility 3
上层1~3片叶有极多孢子堆, 下层叶坏死, 病斑占叶面积61%~75%。 There are abundant spore piles from leaf 1 to leaf 3 at the top and necrotic lower leaves. The percentages of disease spots’ area in leaf are 61%-75%
8
高感1 High susceptibility 1
上层1~3片叶有某些坏死, 病斑占叶面积76%~90%。 There are some necrotic spots from leaf 1 to leaf 3 at the top. The percentages of disease spots’ area in leaf are 76%-90%
9
高感2 High susceptibility 2
叶片坏死, 植株濒于死亡, 病斑占叶面积91%~100%。 Leaves are necrotic and plant are almost dead. The percentages of disease spots’ area in leaf are 91%-100%.
表1 甘蔗褐锈病抗病性鉴定评价标准 Table 1 Identification standard of sugarcane resistance to brown rust disease
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