4个苜蓿品种对豌豆蚜的抗性评价

在大田和室内条件下,采用大量蚜虫侵染幼苗法评价4个苜蓿(Medicago sativa)品种对豌豆蚜(Acyrthosi-phon pisum)的抗性,以筛选出对豌豆蚜高抗的材料。结果表明,甘农5号(HA-3)在大田和室内的抗性植株百分率均显著高于其他品种,分别为50.3%和48.9%,而猎人河的抗性植株百分率在大田和室内均较低,分别为4.0%和4.3%;4个苜蓿品种在大田的抗性级别为甘农5号高抗,甘农3号、金皇后、猎人河均为感虫,室内抗性级别为甘农5号抗虫,金皇后、甘农3号低抗,猎人河感虫。

二十八种印度尼西亚木材对白蚁的抗性

我们进行了二十八种印度尼西亚木材对白蚁抗性的比较研究。研究中使用的试验样品大小为5×10×20mm,使用的白蚁是堆砂白蚁Cryptotermes Cyn-ocephalus和大家白蚁Coptotermes curvignathus在聚类分析的基础上推导出抗性的级别。实验结果表明:黄豆树Albizzia procera、印度黄檀Dalbergia latifolia婆罗洲铁木Eusideroxylon zwagerri、柚木Tectona grandis和印茄Intsia bijuga等对两种白蚁都有抗性。楹树Albizzia chinensis和波罗蜜Artocarpus integer仅对堆砂白蚁具抗性,而对大家白蚁则归入抗性与中度抗性间。其余种类的木材归入中度抗性、敏感和极敏感级。

Construction and Application of a High-throughput Method for Identifying Maize Resistance to Aspergillus flavus in the Field

In order to establish a fast and effective high-throughput method for identifying maize resistance to Aspergillus flavus infection in the field,5 conidial concentrations and 3 inoculation methods were compared and optimized. A correlation model between disease levels and aflatoxin B1 accumulation was established. The results showed that inoculating maize inbred lines with the optimal conidial concentration of 1.0×10^6 c/mL could accurately show the different resistance levels of maize to A.flavus infection,and the spiral quantitative inoculation technique could effectively avoid the defect of calculation error caused by commonly used methods. The positive correlation model of resistance level and aflatoxin B1 accumulation could effectively predict the capability of maize being resistant to A.flavus. 8 resistant and 9 medium resistant maize inbred lines of the RIL population were identified.The spiral quantitative identification method realized the high-throughput identification of maize inbred lines resistant to A.flavus infection in the field,and the results have shown high accuracy,stability and repeatability.