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The Timetable for Development of Maternal Tissues Sets the Stage for Male Genomic Selection in Betula pendula (Betulaceae)

1996; Wiley; Volume: 83; Issue: 7 Linguagem: Inglês

10.2307/2446267

1537-2197

Aslog E. Dahl, Margit Fredrikson,

Molecular Biology Techniques and Applications

American Journal of BotanyVolume 83, Issue 7 p. 895-902 Article The timetable for development of maternal tissues sets the stage for male genomic selection in Betula pendula (Betilaceae) Åslög E. Dahl, Åslög E. Dahl Department of Systematic Botany, University of Göteborg Carl Skottsbergs Gata 22, S-413 19 Göteborg, SwedenSearch for more papers by this authorMargit Fredrikson, Margit Fredrikson Department of Systematic Botany, University of Göteborg Carl Skottsbergs Gata 22, S-413 19 Göteborg, SwedenSearch for more papers by this author Åslög E. Dahl, Åslög E. Dahl Department of Systematic Botany, University of Göteborg Carl Skottsbergs Gata 22, S-413 19 Göteborg, SwedenSearch for more papers by this authorMargit Fredrikson, Margit Fredrikson Department of Systematic Botany, University of Göteborg Carl Skottsbergs Gata 22, S-413 19 Göteborg, SwedenSearch for more papers by this author First published: 01 July 1996 https://doi.org/10.1002/j.1537-2197.1996.tb12782.xCitations: 21 Author for correspondence. AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat Abstract The influence of the sequence of maternal tissue development in Betula pendula upon the potential for male gamete selection was investigated, and the timing of the fixed abortion of one of the two ovules was determined. We used scanning electronic microscopy, confocal laser scanning microscopy, and blue light microscopy. The stigmas remain fresh throughout male anthesis, and may also last after its end, depending on ambient temperatures. The presence of germinated pollen does not induce stigmatic necrotization, and grains may arrive at different times. The pollen tube tips remain within the stigma base until the end of female anthesis. The ovules will not develop until after necrotization of the stigmas. The pollen tubes thus have a fair start to the ovules, regardless of their different arrival times and of the original positions of the pollen grains at the stigma surface. Therefore, competition among different microgametophytes is possible, in spite of low pollination intensity. Our results indicate that when the first pollen tube penetrates an ovule, this ovule starts to outgrow the other one, and even if the other is also penetrated, its vascular support soon atrophies and the megagametophyte will shrivel. Fertilization of both ovules was never seen in this study. Citing Literature Volume83, Issue7July 1996Pages 895-902 RelatedInformation