primordium

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primordium

[prī′mȯrd·ē·əm]
(embryology)
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Caption: Figure 1--Phalaenopsis Classic Spotted Pink hybrid development stages (at 120 DASI), in somatic embryos until complete plant: (A) Protocorm showing the formation of morphogenic structures at the explant base, 15 days after SE-induction; (B) Protocorm showing leaf primordia etiolation (#) and morphogenic structure formation at the base (arrow) (20x); (C) Protocorm showing embryos in different stages at the 30th culture day: globular (*), Torpedo (#) and protocormoids ([section]); (D and E) Chlorophyllated protocormoids from somatic embryos; (F) Complete plants derived from somatic embryos generated from protocorms.
The ancestral state of the family, is reconstructed as having a hemispherically shaped scutellum and undifferentiated leaf primordia, similar to those found in Juncaceae and some Mapanioideae.
The stomodeum is also clearly visible, and there is an initial differentiation of the mandibules, maxillules, maxillae, and maxilliped primordia. The telson reaches the level of the maxillae (Fig.
Snow, "The dorsiventrality of leaf primordia," New Phytologist, vol.
It has been reported that Pax-2 is one of the earliest markers of the developing inner ear, which was expressed in the auditory and vestibular sensory primordia [26, 27] and related to the highly proliferative potential of progenitor cells in developing sensory patches of chicken [28].
Among all these tested combinations, shoot primordia appeared on the calli on SIM1and SIM2 media only after 28 days of sub-culturing(Fig.
tuoliensis is the earliest variety from Xinjiang in China; it needs low temperatures for bud stage and temperature <4degC for the differentiation of mushroom primordia, which are the bottleneck of P.
The emergence of root primordia in air layers, occurred with a continuous vertical linear pattern above the cut area, extending towards the distal region of the branch, which may indicate an origin from ray cells.
In wandering third stadium larvae, pb-GAL4 is expressed in a small ring of cells in the aristal primordia, which was observed in the early prepupae (Figure 2(F)).
On shoot apex longitudinal section was possible to observe standard type colleters between leaf primordia and stipule, emerge on secretion (fig.
Further, during flowering the formation of pistillate organs may be favoured by high auxin level in the vicinity of differentiating primordia.