Download A Photographic Guide to Wild Flowers of South Africa by Braam Van Wyk PDF

By Braam Van Wyk

Включая 265 наиболее обычных южноафриканских дикорастущих вида, книга фокусируется на цветах, которых можно часто встретить вдоль дорог, на открытых пространствах, в национальных парках и на популярных прогулочных маршрутах. Книга дополнена исторической, медицинской и культурной информацией о характеризуемых цветах.
Доп. информация: Файл является рипом с сайта Google Books. Этим определяется отсутствие некоторых страниц (до 20% от общего числа) и невысокое разрешение сканирования (около a hundred dpi).

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This regeneration pathway offers a great potential to be applied in mass propagation, genetic transformation by direct means or via Agrobacterium tumefaciens and as a source of protoplasts as well as for long-term storage of germplasm using cryopreservation. Also fundamental studies of early embryogenesis are easier to be performed with somatic than with zygotic embryos. ), In Vitro Embryogenesis in Higher Plants, Methods in Molecular Biology, vol. 1007/978-1-4939-3061-6_2, © Springer Science+Business Media New York 2016 25 26 Traud Winkelmann problems that are observed in many different plant species, like asynchronous differentiation and further development of somatic embryos, malformations and disturbed polarity, precocious germination, early loss of embryogenic potential, and strong genotypic differences in the regeneration efficiency.

SERK expression was also examined in apomictic Hieracium where it was detected throughout the ovule, and expression was not restricted to the nucellar region or MMC in Hieracium. SERK expression was also observed in developing Hieracium embryos [74]. SERK is therefore thought to play an important role in changing developmental fate of cells, both in stages of apomixis and in somatic embryogenesis. BABYBOOM (BBM) is another gene that has been associated with both in vitro and in vivo asexual embryogenesis.

Despite these differences, in vitro and in vivo asexual embryogenesis share some common factors: a change in the developmental fate of embryogenic precursor cells; and expression of an embryonic pathway in such cells without fertilization. Identifying molecular mechanisms that underlie these processes within in vitro systems may help to understand pathways that lead to apomixis. While some candidate genes for both in vitro and in vivo asexual embryogenesis have been identified, a role in apomixis has not yet been confirmed for any of these genes.

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