TAILIEUCHUNG - báo cáo khoa học: " Cellular localization of ROS and NO in olive reproductive tissues during flower development"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Cellular localization of ROS and NO in olive reproductive tissues during flower development | Zafra et al. BMC Plant Biology 2010 10 36 http 1471-2229 10 36 BMC Plant Biology RESEARCH ARTICLE Open Access Cellular localization of ROS and NO in olive reproductive tissues during flower development Adoración Zafra María Isabel Rodríguez-García Juan de Dios Alché Abstract Background Recent studies have shown that reactive oxygen species ROS and nitric oxide NO are involved in the signalling processes taking place during the interactions pollen-pistil in several plants. The olive tree Olea europaea L. is an important crop in Mediterranean countries. It is a dicotyledonous species with a certain level of self-incompatibility fertilisation preferentially allogamous and with an incompatibility system of the gametophytic type not well determined yet. The purpose of the present study was to determine whether relevant ROS and NO are present in the stigmatic surface and other reproductive tissues in the olive over different key developmental stages of the reproductive process. This is a first approach to find out the putative function of these signalling molecules in the regulation of the interaction pollen-stigma. Results The presence of ROS and NO was analyzed in the olive floral organs throughout five developmental stages by using histochemical analysis at light microscopy as well as different fluorochromes ROS and NO scavengers and a NO donor by confocal laser scanning microscopy. The green bud stage and the period including the end of the recently opened flower and the dehiscent anther stages displayed higher concentrations of the mentioned chemical species. The stigmatic surface particularly the papillae and the stigma exudate the anther tissues and the pollen grains and pollen tubes were the tissues accumulating most ROS and NO. The mature pollen grains emitted NO through the apertural regions and the pollen tubes. In contrast none of these species were detected in the style or the ovary. Conclusion The results obtained clearly demonstrate .

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