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本试验从健康的鸡盲肠内容物中筛选出具有较高抑菌活性的病源拮抗菌JM-11菌株,经形态、生理生化及16S rDNA序列鉴定此菌为枯草芽孢杆菌(Bacillus subtilis subsp. subtilis)。经耐受胃肠道环境及胆盐试验,结果表明,JM-11菌株能耐受0.3%的胆盐环境,在pH为3.0的人工胃液中能够很好的存活。利用抗生素打乱雏鸡肠道菌群后,饲喂致病性大肠杆菌来制作腹泻模型。经益生菌JM-11对腹泻雏鸡的治疗试验结果显示,JM-11能显著降低腹泻雏鸡粪便中的大肠杆菌的数量(P<0.01),增加乳酸菌的数量(P<0.01),提高雏鸡免疫器官指数(P<0.05),对雏鸡具有安全无毒的作用。 相似文献
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为了了解各地选育的棉花品种丰产性、适应性、抗虫性和利用价值,筛选出适合本地推广的棉花品种,为2008年全市推广棉花品种提供科学的依据,我们承担了南通市种子管理站的棉花品种比较试验项目。 相似文献
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Yielding Ability of Pure Stands and Equal Proportion Blends of Rapeseed (Brassica napus L.) with Double-low Quality 总被引:1,自引:0,他引:1
Yielding ability of intraspecific mixtures is an important issue not only for homozygous and homogeneous crops but also for heterozygous and/or heterogeneous ones. The goal of the present study was to examine the performance of mixtures and synthetics from double-low (low in erucic acid and glucosinolates) rapeseed ( Brassica napus L.) as compared to pure stands. The material consisted of seven lines and from 1982/83 to 1984/ 85 lines, all possible biblends and syn1 's (1983/84 and 1984/85 exclusively) were grown in a completely randomized block design. An analysis of variance was conducted and general mixing effects (g.m.e.) and specific mixing effects (s.m.e.) were calculated for components of biblends. A few pure-standing lines yielded higher than some mixtures. Nevertheless, the overall mean of mixtures was not exceeded by any pure stand. For selection purposes, the higher variance of 'among lines' in comparison with 'among blends' would not result in higher yields because of the generally higher yielding ability of blends. Additionally, mixtures were marked by higher yield stability as compared to pure-standing lines. On the average of two years of testing yields of syn1 's amounted higher than yields of mixtures. Differences between 'g.m.e.' of lines were proved and moreover, the variance component of 's.m.e.' was on a lower level than that of 'g.m.e.'. Consequently, in order to find the best mixture it seemed not necessary to analyse a complete diallel rather than to apply factorial or incomplete factorial concepts. 相似文献
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AMMI模型在蓖麻杂交育种中的应用 总被引:1,自引:0,他引:1
在蓖麻品种的育成与推广过程中,品种产量性状的稳定性是一个重要影响因子。由于品种的基因型和环境存在着交互作用,用一般的线性回归方程只能解释小部分交互作用。主效可加互作可乘模型(AMMI模型),不仅最大程度地反应互作变异,而且能准确地分析品种的稳定性。本文应用AMMI模型及双标图对4个蓖麻杂交组合2008-2009年多点试验的产量性状进行稳定性分析,进而评价各参试组合的稳定性和适应性。 相似文献
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甘蔗新品种桂辐98-296的丰产性、稳定性、适应性及抗性分析 总被引:1,自引:1,他引:1
【目的】分析甘蔗新品系桂辐98-296在不同生态条件蔗区表现情况,了解其生产利用和育种价值;【方法】以国家甘蔗品种第6轮区域试验的结果为依据, 通过产量(蔗茎产量与蔗糖产量)、变异系数和回归系数对该品种和对照品种的丰产性、稳产性、适应性和抗逆进行分析比较;【结果】桂辐98-296其公顷产蔗量为115.56吨、产糖量17.12吨,分别位居所有参试品种的第二名和第一名,与对照差异达极显著水平;产量主效应值大,蔗茎产量、蔗糖产量效应值分别为8.95和1.34,在所参试品种中产蔗量产糖量分别位居第二位和第一位;蔗茎产量、蔗糖产量变异系数分别为12.03和11.53,在所参试品种中分别位居第八位和第九位;蔗茎产量、蔗糖产量回归系数分别为0.98和1.00;黑穗病人工接种株发病率为7.69%,属抗性2级;花叶病人工接种株发病率为0,属抗性1级;干旱协迫条件下平均株高伤害率为17.91%;【结论】桂辐98-296属于丰产型高糖品种,适应性强,稳产性一般;高抗甘蔗花叶病,抗甘蔗黑穗病,具有较强的抗旱能力。特别适于中等或以下肥力的旱坡地种植。 相似文献
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利用姊妹种改进玉米种子生产技术的初步研究 总被引:4,自引:0,他引:4
1987-1989年对以姊妹种代替姊录系改进玉米种子生产技术所涉及的几个关键问题进行了研究。结果表明,姊妹的产量,农艺性状、整齐度优于对应的姊妹第,用其制种可增产50%以上,姊妹种的合配力水平与对应姊妹系相当且可稳定遗传;改良单交种的产量、农艺性状、整齐度类似相应单交种。 相似文献
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Callus was induced from segments of immature inflorescences of Elymus canadensis×Psathyrostachys juncea and Elymus canadensis×Secale cereale F1 hybrids on MS medium supplemented with 2 mg/l of 2,4-D and plants were regenerated from the calluses on a hormone free MS medium. The plants regenerated from both the hybrids exhibited a high degree of stability in morphology, chromosome number and chromosome pairing. The reasons for this are discussed. 相似文献
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对初步证明有应用前景的新苗头组合进行区域内多年多点鉴定试验,在丰产性、稳产性和区域适应性方面综合评价有应用前景的新杂交种。本研究于2016-2018年以黄淮南部地区种植的7个品种组合在6个试验地点产量结果进行分析,结果表明:参试品种产量的环境效应和基因型×环境互作效应均存在极显著差异。从参试地点看出苏试51417丰产性和稳产性综合评价很好;金大丰1906和苏玉41稳产性很好,丰产性较好,综合评价良好,相对具有较大的推广应用空间,适合江苏省春夏播区域种植。 相似文献