Exact(6)
In the first node of this secondary axis three buds originate, two of them develop into flowers, the third one becomes in an EFN, in the following nodes, only EFNs develop (Figure 2A, B).
Figure 5 TEM of the EFN in stage 3 of V. adenantha (central cells).
Figure 4 TEM of the EFN in stage 3 of V. adenantha (ring).
At the base of the EFN in formation, vascular bands are observed (Figure 2E, F).
When the fruits have seeds with embryos in the globular stage, at least one EFN in stage 4, one EFN in stage 3 and one EFN in stage 1 coexist in the same secondary axis of the inflorescence, so the EFNs activity is continuous during maturation of the fruits (Figure 2A).
The formation of a middle moon or complete ring depends on the relative position of each EFN in the secondary axis and the consequent available space. Figure 1 Squematic representation of an inflorescence of Vigna adenantha.
Similar(54)
There are no other reports on the development of the EFNs in Vigna.
The EFNs in V. adenantha are generated from aborted floral primordia.
Kuo and Pate ([1985]) described the EFNs in the secondary axis of the inflorescences of Vigna unguiculata as a compound structure formed by various conical secretory subunits but they did not clarify if all of them are active at the same time.
We also searched for EFNs in plant species not included within the sampled transects.
We observed no EFNs in annual herbaceous species or grasses and found no species with domatia or food bodies.
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