Histological Investigation on Floral Reversion of Impatiens balsamina L. Cytological and Cytochemical Studies of Temperature Induced Male Sterility in Taihangia rupestris Research on Number Variation of Floral Organ in Onion(Allium cepa L.) A Comparative Study of the Development of Buds and Stamens and Pistils of Different Male Sterile Lines in Brassica napus L. INTRAFLORAL STAMEN DIFFERENTIATIONS AND THEIR ADAPTIVE SIGNIFICANCES Histological Investigation on Floral Reversion of Impatiens balsamina L. Clone and Expression of Ethylene-responsive Factor Gene in Non-heading Chinese Cabbage