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玉米自交系郑１１４２的花粉在－１９６℃保存１～２年后，田间授粉于原自交系郑１１４２，获得的后代植株，其花粉母细胞减数分裂时染色体数目和结构均属正常
The pollen of Zheng 1142 was preserved at -196 ℃ for 1 ~ 2 years. After pollination, the progeny plants pollinated in the original inbred line Zheng 1142 had normal number and structure of chromosomes at meiosis of pollen mother cells