Pakistan Journal of Biological Sciences
1028-8880
1812-5735
Asian Network for Scientific Information
10.3923/pjbs.2007.843.851
Solanum tuberosum L.)]]>
Iranbakhsh
Alireza
Ebadi
Mostafa
Bakhshi Khaniki
Gholamreza
6
2007
10
6
The main aim of this investigation is the understanding
of how microtubers are formed out of auxiliary buds in induced conditions.
In the induced buds, meristematical cells with high cytoplasmic and nuclear
stain ability expand deeper into the inner sections of the buds, comparing
with non-induced buds, which the area is restricted to the apical regions.
The first sign of microtuberization is the increase in size of cortical
parenchyma cells in lower section and also increase in mitosis divisions
in inner sections of the meristems. Most of the growth rates occur in
the induced medium along the length and the width of the cells. It is
also considered that the diametric growth of the tubers and the base of
the leaves on the tubers begin their radial growth. The cortical parenchyma
cells begin forming amidon grains during their vacuolar extension at extending
the internodes much earlier than pith parenchyma cells. The extension
of cells in sub-apical region plays an important role in the longitudinal
growth of tubers. In the first stages, the growth of tubers results from
the change in the dimensions of cortical and pith parenchyma cells, due
to the reproduction of apical meristem and later, mainly from the growth
of the productive tissue in the pith parenchyma. Longitudinal growth is
initially grater than the growth in diameter; however with shift in the
position of vacuoles and their arrangement across rather than along the
tubers, the growth pattern begins to change and lateral growth catches
on and exceeds longitudinal growth. In fully grown tubers, pith parenchyma
cells are larger than the cells in cortical parenchyma.]]>
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