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作 者:程建峰[1] 戴延波[1] 姜东[1] 潘晓云[1] 刘宜柏[2] 曹卫星[1]
机构地区:[1]南京农业大学农业部作物生长调控重点开放实验室,南京210095 [2]江西农业大学农学院,南昌330045
出 处:《土壤》2008年第2期243-248,共6页Soils
基 金:国家自然科学基金重点项目(30030090);国家863计划项目(2001AA245041)资助
摘 要:采用盆栽土培法,选用12个不同年代的水稻种质,对6个不同土壤N营养水平下水稻对稻纵卷叶螟主害代(孕穗期前)危害的抗性差异及与土壤N营养的关系进行了研究。结果表明:不同水稻种质对稻纵卷叶螟抗性存在显著差异,可分为低抗、中抗和高抗3类。低抗和高抗的较少.中抗的较多,且筛选鉴定水稻对稻纵卷叶螟抗性的最佳土壤N营养量为N 0.24 g/kg土(折合N 122.40 kg/hm^2)。随土壤N营养量变化,水稻种质对稻纵卷叶螟抗性的响应存在显著基因型差异,可分为低响应、中响应和高响应3类,低、中响应种质较少,高响应种质较多。随土壤N营养量变化,稻纵卷叶螟对水稻种质的危害规律表现为二项式开口向上、二项式开口向下和无规律3类,二项式开口向上的种质危害最低时的最适土壤N营养量平均为N 0.27g/kg土(折合N 136.53 kg/hm^2),二项式开口向下的种质危害最高时的最适土壤N素营养量平均为N 0.12 g/kg土(折合N 74.03 kg/hm^2)。Twelve rice germplasm released in different years were used in a pot experiment to study resistance difference to the major pestilent generation of Cnaphalocrocis medinalis Guenee and its relationship with soil nitrogen nutrition. Results showed that the resistance to Cnaphalocrocis medinalis (Guenee) varied notably among cultivars and twelve rice cultivars could be divided into three groups, low, medium, and high resistance types. Optimum soil nitrogen content for identifying and screening rice resistance to Cnaphalocrocis medinalis (Guenee) was 0.24 g/kg soil (converted into N 122.40 kg/hm2). When the soil changed in nitrogen content, their responses in resistance to Cnaphalocrocis medinalis (Guenee) varied markedly among cultivars. So they could be divided into three groups, low, medium, and high response types. And most of the cultivars were in the group of "High". The damages of Cnaphalocrocis medinalis (Guenee) to rice plants could be sorted into three types, upward open binomial, downward open binomial, and irregular. For the first type, when the soil nitrogen content was 0.27 g/kg, the damage was the least, and for the second, when it was 0.12 g/kg, the damage was the highest.
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