line breeding [农学] 品系繁育 ; [农学] 系统育种 ; 系群繁育
pure line breeding [农学] 纯系育种 ; 纯育
Line-breeding 系统繁殖
pure-line breeding 纯系繁育
family line breeding 母系选择育种法
inbred line breeding 自交系选育
sterile line breeding 不育系选育
Various approaches have been used to improve the performance of adapted indigenous stock, including cross-breeding and upgrading through back-crossing with improved breeds, and within-line selection.
已有多种方法被用于提高地方良种的性能，包括杂交育种，以及通过与良种的回交和品系内选育进行的品种改良。
The team is now doing field tests. The first breeding line is expected to be released next year for use by private seed companies and public soybean breeders.
干旱小组目前正在做田间试验。第一繁育系预期在明年发布，仅为私人种子公司和公共大豆育种者使用。
Using this technology, the purity problem during seed production in three-line, two-line or chemical-emasculated hybrid rice breeding system could be solved and some new combinations could be bred.
利用这项技术可望解决三系、两系或化学杀雄杂交稻制种过程中出现的纯度问题，且有利于新杂交稻组合的选育。
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