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The Cytomorphology of the Fertility Restoration in Thermo-sensitive Male Sterile Chinese Cabbage TsCMS7311

DONG Mei-yun,ZHANG Lu-gang and DENG Yong-ling (College of Horticulture,Northwest A&F University;Key Laboratory of Horticulture Plant Germplasm and Genetic Improvement,Ministry of Agriculture,Yangling Shaanxi 712100,China)  
Thermo-sensitive male sterile Chinese cabbage TsCMS7311 was used as test materials,and the cytomorphology was carried out in anthers of the fertility restoration and not.It was found that there was no significant difference between two groups before the stage of archesporical cell.Under normal temperature,anthers of not fertility restoration stopped developing in the stage of archesporical cell;1-2 comers of a few anther could differentiate and form archesporical cell,sporogenous cells and microspore mother cell,but microspore mother cell disintegrated on the first meiotic division.Under low temperature condition,fertility restoring,anther developing normally,the tetrads formed after archesporical cell,sporogenous cells and microspore mother cell.Subsequently,microspores were free from the tetrad of fertile anther and formed mature pollen grains,tapetumof the fertile anthers began to disintegrate and disappear at last.
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