However , the genetic differences of maintainer lines and the seventh restorers will be further studied by molecular technique .

然而，对于保持系和第7类恢复系而言，需借助分子手段进行研究以进一步了解其遗传差异。

The methods of hybrid seed production by using genetic male sterile lines and their corresponding restorers bad been studied .

利用选育成的芝麻雄性核不育系及相应恢复系，研究以现蕾至始花期花药特征为标记获得全不育的芝麻两系法制种效果。

And japonica restorers for HL or CL CMS lines could be selected from the japonica restorers for BT CMS lines .

从BT型粳稻恢复系中可以筛选到HL型或CL型粳稻不育系的恢复系。

But these CMS plants had some problems of young leaf chlorosis , floral organ variation and hardly searching for restorers .

但存在幼叶黄化，花器官变异以及恢复系难找等问题。

In the past , to remove foreign materials encrusted on ancient artworks restorers used reactive chemicals that are non-selective and toxic .

过去，修复人员使用一些易起反应的化学品来去除沉积在古老艺术品表面的外来物，但这些化学品不具有选择性而且有毒。