open pollination meaning in English

开放传粉
自然传粉
自由传粉
自由授粉

Sweetpotato pollens killed by u . v . didn ' t sprout ; 2 . normal pollens sprouted ; 3 . pollens of 5x mixed with recognition pollens attached and sprouted much ; 4 . in the negative - cross , sweetpotato pollens attached and sprouted much on the stigma of 5x ; 5 . in the possitive - cross without recognition pollen , 5x pollens few attached and sprouted ; 6 . in the treatment of pgr ( twice ) , globular - embryo observed on 15 days after pollination ; 7 . ovule obtained by intercross germinated on the medium ; 8 . plantlet from intercross ovule grew on the medium ; 9 . seeds obtained by opening pollination ; 10 . tubers of hybrids from 5x crossed by sweetpotatos for two generations
紫外线杀死的甘薯花粉在亲和柱头上不萌发； 2 .未经紫外线处理的甘薯花粉在柱头上正常萌发； 3 .在蒙导花粉作用下，五倍体的花粉在甘薯柱头上大量附着和萌发； 4 .反交组合甘薯花粉在五倍体柱头上大量附着和萌发； 5 .正交组合无蒙导花粉时五倍体花粉少量附着和萌发； 6 .生长调节剂二次处理后，授粉后15天所见的球形胚； 7 .杂交胚珠在培养基上萌发； 8 .杂交胚珠培养成苗； 9 .放任授粉收获的大量种子； 10 .五倍体与甘薯杂交两代产生的后代群体的结薯性。