排序方式： 共有6条查询结果，搜索用时 46 毫秒
1
1.
我国玉米栽培面积仅次于水稻和小麦，为第3大粮食作物。目前我国每年种植玉米面积有2100万亩，占总耕地面积的22％，占粮食总产量的20％。而以西南地区为主的南方地区是我国三大玉米主产区之一，种植面积和总产量分别占全国玉米总面积、总产量的30％左右。玉米具有粮食、饲料、工业等多种用途，其生产形势直接关系着国计民生。 相似文献
2.
[目的]筛选出对稻曲病菌抑菌效果显著的杀菌剂及其最佳混配比例,[方法]从雅安稻田发病严重的稻穗上分离出稻曲病菌株,选择6种杀菌剂以及井冈霉素和烯唑醇不同混配比例,用菌丝干重法对稻曲病菌菌丝的生长进行室内毒力测定,并根据Wadley方法评价混剂的相互作用。[结果]各杀菌单剂对稻曲病菌菌丝的生长均有一定的抑制效果。其中,烯唑醇和井冈霉素对稻曲病菌菌丝生长的抑制效果最好,其EC50值分别为22．07和90．16μg/m;其次为甲基硫菌灵和三唑酮,其EC50值分别120．89和129．30μg/ml;多菌灵和三环唑抑制效果最差,其EC50值分别为278．04和204．41μg/ml。当井冈霉素和烯唑醇按EC50剂量3：1和5：1的比例混配时,其SR分别为1．8124和1．9052,表现出较好的增效作用。[结论]该研究为进一步研发防治水稻稻曲病的复配制剂提供科学依据。 相似文献
3.
Abstract:Fusariam head blight(FHB)is a worldwide destructive disease of wheat in the warm,semi-humid or humid regions,especially serious in China.The disease not only causes significant losses in yield and re duces grain quanlity,but also induces toxin to contaminated seeds,which is harmful to the healthy of human and livestocks,So it is important to control it.There are several methods to control Fusarium head blight (FHB).Such as using Crop rotation,Soil cultivation and Fertiliser,biological control,Fungicides control, transgenes,resistance to control Fusarium head blight(FHB).All of these methods gain some effect,but also exist their deficiency.Sometimes crop rotation had no significant effect on DON contamination of wheat grain,subsequent reductions in DON contamination were inconsistent when using Soil cultivation and Fer tiliser,Unfortunately,under field conditions,the biological control achieved has been shown to be variable and in some tests has failed to give any control,The use of fungicides,however,have not been consistently effective in controlling FHB and in reducing DON formation,transgene-silencing at different generations is a problem to use transgenes,Information on location of QTL for FHB resistance should improve dramatically in the near future on resistance to control Fusarium head blight(FHB).Therefore,it is pressing to improve control methods,especially to DON. 相似文献
4.
Abstract:Fusariam head blight(FHB)is a worldwide destructive disease of wheat in the warm,semi-humid or humid regions,especially serious in China.The disease not only causes significant losses in yield and re duces grain quanlity,but also induces toxin to contaminated seeds,which is harmful to the healthy of human and livestocks,So it is important to control it.There are several methods to control Fusarium head blight (FHB).Such as using Crop rotation,Soil cultivation and Fertiliser,biological control,Fungicides control, transgenes,resistance to control Fusarium head blight(FHB).All of these methods gain some effect,but also exist their deficiency.Sometimes crop rotation had no significant effect on DON contamination of wheat grain,subsequent reductions in DON contamination were inconsistent when using Soil cultivation and Fer tiliser,Unfortunately,under field conditions,the biological control achieved has been shown to be variable and in some tests has failed to give any control,The use of fungicides,however,have not been consistently effective in controlling FHB and in reducing DON formation,transgene-silencing at different generations is a problem to use transgenes,Information on location of QTL for FHB resistance should improve dramatically in the near future on resistance to control Fusarium head blight(FHB).Therefore,it is pressing to improve control methods,especially to DON. 相似文献
5.
6.
姜瘟病是由茄科雷尔氏菌(Ralstonia solanacearum)引起的一种细菌性病害,是世界生姜产区中普遍发生的一种毁灭性土传病害。研究表明,从发病田中未发病植株的根际土壤中分离得到的蜡状芽孢杆菌菌株L1(B.cere-us,L1)对茄科雷尔氏菌等8种病原菌具有较强的拮抗能力,具有广谱抗性。经Econo-Pac Q离子交换柱纯化、SDS-PAGE分析,从菌株L1得到一个表观分子量约为40 kDa的拮抗蛋白Lp,该蛋白具有光稳定性,在pH 6.0~8.0,温度20~60℃条件下均表现出对茄科雷尔氏菌的极强拮抗能力,但经胰蛋白酶处理后失活。实验表明,0.38 mg/mL为该蛋白的最低拮抗浓度。 相似文献
1