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Pollen development and multi-nucleate microspores of Populus bolleana Lauche

ZHANG Zheng-hai1,KANG Xiang-yang1,WANG Shang-de2,LI Dai-li1,CHEN Hong-wei1 1Key Laboratory for Genetics and Breeding of Forest Trees and Ornamental Plants of Ministry of Education,Beijing Forestry University,Beijing 100083,P.R.China 2Institute of Integrative Agricultural Development,Beijing Academy of Agricultural and Forestry Sciences,Beijing 100089,P.R.China  
Populus bolleana is a variety of P.alba,commonly used in poplar breeding programs in China.Developmental biology that involves staminate flowers,microsporogenesis and microgametogenesis of P.bolleana is essential for Populus improvement in cross breeding for better characteristics in sexual reproduction.Flower morphology and pollen development were described and illustrated using anatomical,sectioning and stain-clearing techniques.The results show that microsporocytes undergo a regular meiotic process,but some multi-nucleate microspores occur at the microspore stage.It takes five days for microsporocytes to develop to mature pollen by forcing flower branches under greenhouse conditions.Additionally,an important relationship was found between stages of meiosis and anther colors.Microspore tetrads formed when the anther color turned yellow,whereas,when the pollen matured,the anther was red and the tapetum degenerated completely.When mature pollen grains are formed,flower buds develop into male cat-kins.In the end,filament elongated and pollen grains were released from dehisced anthers.
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