| Full text | |
| Author(s): |
Cruz, Rafael
;
Melo-de-Pinna, Gladys F. A.
;
Vasco, Alejandra
;
Prado, Jefferson
;
Ambrose, Barbara A.
Total Authors: 5
|
| Document type: | Journal article |
| Source: | INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES; v. 21, n. 12, p. 13-pg., 2020-06-01. |
| Abstract | |
Unlike seed plants, ferns leaves are considered to be structures with delayed determinacy, with a leaf apical meristem similar to the shoot apical meristems. To better understand the meristematic organization during leaf development and determinacy control, we analyzed the cell divisions and expression ofClass I KNOXgenes inMickelia scandens, a fern that produces larger leaves with more pinnae in its climbing form than in its terrestrial form. We performed anatomical, in situ hybridization, and qRT-PCR experiments withhistone H4(cell division marker) andClass I KNOXgenes. We found thatClass I KNOXgenes are expressed in shoot apical meristems, leaf apical meristems, and pinnae primordia. During early development, cell divisions occur in the most distal regions of the analyzed structures, including pinnae, and are not restricted to apical cells. Fern leaves and pinnae bear apical meristems that may partially act as indeterminate shoots, supporting the hypothesis of homology between shoots and leaves. ClassI KNOXexpression is correlated with indeterminacy in the apex and leaf of ferns, suggesting a conserved function for these genes in euphyllophytes with compound leaves. (AU) | |
| FAPESP's process: | 15/15920-3 - Class I KNOX expression in developing leaves of Mickelia scandens (Dryopteridaceae) |
| Grantee: | Rafael da Silva Cruz |
| Support Opportunities: | Scholarships abroad - Research Internship - Doctorate |
| FAPESP's process: | 15/15158-4 - ANATOMICAL AND MOLECULAR STUDIES OF THE LEAF DEVELOPMENT |
| Grantee: | Gladys Flávia de Albuquerque Melo de Pinna |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 13/26191-7 - Leaf development in Dryopteridaceae species under the morphological approach of Agnes Arber |
| Grantee: | Rafael da Silva Cruz |
| Support Opportunities: | Scholarships in Brazil - Doctorate |