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SOME EMBRYOLOGICAL OBSERVATIONS ON POPULUS TOMENTOSA CARR.Ⅰ. STRUCTURE OF ANTHER AND DEVELOPMENT OF POLLEN

Dong Yuan  
Plant material used in this paper,was collected periodically in consequent lots from male trees of Populus tomentosa Carr.growing in Zhengzhou,Henan province,and,Beijing during the period of 1980-1982.Observations showed that microsporogenesis is of the simultaneous type.The arrangement of tetrads is of three types,tetrahedral,isobila-teral and cross shaped.Most mitoses of the microspores are unequal; but some are equal and form two equal cells with which no vegetative and generative cells can be distinguished.It is porsible that,such micro-spores have already been developed along the B ways in tissue culture of plant. Detail descriptions of the morphological and anatomical characteristics of the sterile male were given,anthers shedding no pollen grains became contracted and wrinkle at maturity,wall of epidermis cells of anther wall became canine tooth-like; shapes and sizes of sterile pollens were extremely variant; nuclei none or very small and colorless or deeply stained.Pollen abortion was perhaps due to abnormal tetrads formed in end of meiosis I.During meiosis the tapetum development was also very abnormal.This behavior of tapetum may have close relation with pollen abortion.
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