Development of the ovule and embryo sac
The functional megaspore undergoes three successive mitoses resulting in the formation of an 8- nucleate embryo sac
of the Polygonum type.
There seems to be no doubt that the endothelium is a nutritive layer, whose main role is to work as an intermediate for the transport of nutrients from the integument to the embryo sac
After the embryo sac
in fertilized by the pollen tube, the ovule gradually turns into a seed, and the carpel becomes a fruit.
So, the present investigation has been conducted to determine the chromosome number of a series of Brazilian accessions of Caespitosa, and to analyze the type of embryo sac
in representatives of three species.
The female gametophyte corresponds to the embryo sac
and covers an egg cell, a central cell, two synergid cells, and several antipodal cells.
Through this route, immature ovules are cultured up to maturation of embryo sac
, where a haploid embryo is developed.
development and fruit set of 'Satohnishiki' sweet cherry as affected by temperature, GA3 and paclobutrazol.
The nucellar cells that limit the embryo sac
are elongated tangentially.
The plant triggers auxin synthesis at one end of the female reproductive unit called the embryo sac
, creating an auxin gradient.
In the new study, the researchers surveyed more than 2,000 genes on synergid cells to identify which molecules lured pollen tubes to the embryo sac
Embryos were originated directly from inside of embryo sac
without contributing of callus (direct embryogenesis).