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《Journal of Gansu Agricultural University》 2014-02
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Anatomical study on pollen development of Sassafras tzumu(Hemsl.)Hemsl

WANG Xin;YU Fen;JI Chun-feng;LONG Chun-ling;YANG Guang-yao;College of Forestry,Jiangxi Agricultural University;Camphor Engineering Center of SFA;  
Pollen development of Sassafras tzumu were studied by the methods of parafin technology. The results showed that Sassafras tzumu was hermaphrodite flower,anther had four rooms,the glands like horseshoe and anther sac was valvular dehiscence.Mononuclear microspore had a large nucleus,located in the central.With mononuclear microspore was vacuolization,there were two sizes of nuclear,finally form a maturation pollen.Mature pollen is two-cell type,contains a large vegetative nucleus and a small reproductive nucleus.The mature pollen grains were spherical observed by scanning electron microscope,and were covered with spines.The pollen had no aperture.The anther wall was composed of epidermis,endothecium, middle lamella and tapetum from the outside to the inside.The development of anther wall belonged to the basic model;the epidermis consists of one layer of cells,which existed during the development;endothecium was formed ribbon fiber layer thickening when the anthers mature;middle lamella and tapetum cells disappeared when the pollen had matured.There were many pollens only with walls,causing pollen deviant, which impacts directly on the quality and pollen viability of Sassafras tzumu,and thus affecting fructification.
【Fund】: 江西省重大科技专项项目(49100524-3);; 江西省研究生创新专项(YC2012-S058)
【CateGory Index】: S792.22
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