Its use is limited to the preservation of breeding material or the establishment of clonal seed orchards.

其用途仅限于保持育种材料或建立无性系种子园。

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By means of multielement analysis, 7 character indexes of 49 breeding material had been made by a main composition and cluster analysis in malting barley.

利用多元分析法对49个二棱型啤酒大麦育种材料的7个主要性状指标进行了主成份分析与聚类分析。

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Since high degree of sugar beet self-incompatibility, it often leads to loss of fine individual genotype, and is hard to keep good breeding material for breeding.

由于甜菜的高度自交不亲和性，常导致优良植株基因型的丢失，给优良育种材料的保存带来了很大的困难。

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Given a start with some other fissile material (U-233, U-235 or Pu-239) as a driver, a breeding cycle similar to but more efficient than that with U-238 and plutonium (in normal, slow neutron reactors) can be set up. (The driver fuels provide all the neutrons initially, but are progressively supplemented by U-233 as it forms from the thorium.) However, there are also features of the neutron economy which counter this advantage.

FORBES: Is Thorium the Biggest Energy Breakthrough Since Fire? Possibly.