Contoh starchy

• In addition to starch and protein, the starchy endosperm is a repository for nucleic acids and micronutrients.

• From this it can be concluded that it takes 5 days for all the starchy endosperm cells to lose plasma membrane integrity.

• Since they do not surround starchy tissue which requires hydrolysis during germination, it is unlikely that this aleurone produces large quantities of -amylases.

• The secretory apparatus of the aleurone then proliferates, supporting increased hydrolase synthesis and secretion to degrade the starchy endosperm.

• The amylases that degrade the starchy endosperm after germination are largely secreted by the aleurone layer after imbibition.

• However, we will come back to the problem of small starchy seeds later.

• Thus, there is no clear ultrastructural characterization of how starchy endosperm cells die during development.

• Three classes of aleurone cells are distinct from the typical aleurone surrounding most of the starchy endosperm.

• No expression is found in the parts of the seed not surviving desiccation, the maternal tissue and the starchy endosperm.

• Surrounding the starchy endosperm is a highly specialized layer of endosperm tissue that remains cellular and viable at grain maturity.

• Other components of the starchy endosperm may be further regulators of aleurone function.

• The latter type probably characterizes dead cells because of the similarity in appearance to mature starchy endosperm cells (micrograph not shown).

• Thus, in the case of premature slow drying, when differentiation into starchy endosperm cells is arrested, the meristematic cells acquire desiccation tolerance.

• The endo-b-mannanase in the starchy endosperm was mainly from the aleurone layer.

• The storage polymers in the starchy endosperm must then be mobilized and transported to the embryo to fuel its subsequent heterotrophic growth.