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具有增加氮素固定潜力的紫花苜蓿品种可能是有益的。育种计划中为实现这个目标,作为基因来源的现有满意的品种还没有报导过。与秋季休眠期、投产日期和种质起源有关的10个紫花苜蓿品种,用10个星期苗龄的幼苗,夏季栽培在无硝酸盐的沙土上来测定氮的固定指标。氮固定指标的最大差别是在品种内的不同植株间,而不是品种间。这个结果指出了所有被鉴定的品种都可能作为提高紫花苜蓿氮素固定能力的材料来源。秋季休眠的性质,品种的年龄、或种质的来源都认为是没有影响的。无机氮肥的供应和成本是与各种石油燃料的有效性紧密相连的。现在能源的形势鼓励了后备能源的研究与氮素的生物合成。据报导,紫花苜蓿氮素固定量一年能达到300～600公斤/公顷。Seetin和Barnes曾发现“Saranac”和“Agate”品种与乙炔还原作用弱而选择的植株后代相似,而Dubigg等报导了“Mesilla”品种相似的结果。这就暗示了这些品种在氮素固定上可能不是高效的。根据乙炔还原作用强而选择出的无性系之间的杂交所产生的后代,其乙炔还原作用大约是亲本品种的二倍。Heichel等用N~(15)分析技术,指出了按乙炔还原作用而选择的植株与不选择的相比,其幼苗在温室环境下由于共生而固定的氮,植株中含氮百分率显著增加,而且在田间条件下单位面积上氮固定量也增加了。本项研究的目的是鉴定紫花苜蓿品种在氮素固定指标上的差异情况,以及两个品种若有差异,确定它们平均的性能,或者是品种内表现型之间的差别。
Alfalfa varieties with increased nitrogen fixation potential may be beneficial. Breeding programs to achieve this goal, as the source of the existing source of satisfactory varieties have not been reported. Ten alfalfa cultivars related to fall dormancy, date of commissioning and the origin of germplasm were used to determine the nitrogen fixation index with seedlings of 10-week-old seedling in summer without nitrate. The biggest difference between the nitrogen fixation indicators is within the variety of different plants, rather than between varieties. This result indicates that all the identified cultivars may serve as a source of material for enhancing nitrogen fixation of alfalfa. The nature of fall dormancy, the age of the breed, or the origin of the germplasm are considered as unaffected. The supply and costs of inorganic nitrogen fertilizers are closely linked to the effectiveness of various petroleum fuels. The energy situation now encourages research on reserve energy and nitrogen biosynthesis. It has been reported that nitrogen fixation of alfalfa can reach 300 to 600 kg / ha in one year. Seetin and Barnes have found that the “Saranac” and “Agate” varieties are similar to those selected for plant regeneration with weak acetylene reduction, whereas Dubigg et al. Reported similar results for the “Mesilla” variety. This suggests that these species may not be efficient at nitrogen fixation. The progeny produced by the cross between clones selected on the basis of strong acetylene reduction are about twice as much acetylene reduction as the parental variety. Heichel et al. Used N 15 analytical techniques to point out that plants selected for acetylene reduction have a significantly increased nitrogen content due to symbiotic immobilization of nitrogen in the greenhouse compared with no selection, and Nitrogen fixation per unit area also increased under field conditions. The purpose of this study was to identify differences in the nitrogen fixation indices of alfalfa cultivars, and if there was a difference between the two cultivars, to determine their average performance, or the difference between the within-breed phenotypes.