DNA synthesis during development of adventive embryos of wild carrot
Tóm tắt
Embryo development in cultured wild carrot tissue was studied by considering the relationship between DNA biosynthesis and embryo morphogenesis. Autoradiographic data of3H-thymirdine incorporation indicated a higherpercentage of cells undergoing DNA synthesis in adventive embryos than in proembryonic masses. A definite pattern of DNA synthesis was observed during the transition from a proembryonic mass to the torpedo stage of embryogenesis. In particular the labeling pattern for both the heart and torpedo stages was found to be coincident with specific morphogenetic events.
Tài liệu tham khảo
Jensen, W. A.: The composition and ultrastructure of the nucellus in cotton. - J. Ultrastruct. Res.13: 112–128, 1964.
Maksymowych, R., Devlin, R. G., Blum, M. K., Wochok, Z. S.: Activity of the marginal and plate meristems during leaf development inXanthium pennsylvanicum. - Amer. J. Bot.156: 26–30, 1969.
Pollock, E. G., Jensen, W. A.: Cell development during early embryogenesis inCapsella andGossypium. -Amer. J. Bot.51: 915–921, 1964.
Schultz, R., Jensen, W. A.:Capsella embryogenesis: the egg, zygote and young embryo. - Amer. J. Bot.55: 807–819, 1968.
Torrey, J. G., Galun, E.: Apolar embryos ofFucus resulting from osmotic and chemical treatment. - Amer. J. Bot.57: 111–119, 1970.
Waedlaw, C. W.: Morphogenesis in Plants. - Metheren and Co., London, 1968.
Wetherell, D. F., Halperin, W.: Embryos derived from callus tissue cultures of wild carrot. - Nature200: 1336–1337, 1963.