Detail Orchid flower evolution (RESEARCH NOTE in Journal of Genetics, Vol. 84, No. 1, April 2005) Bibliografi Author: Rajkumari, J.D. ; Longjam, R.S. Topik: Orchid flower; Evolution; phenotypic expressions; genetic mechanism Bahasa: (EN )     Tahun Terbit: 2005     Jenis: Article - diterbitkan di jurnal ilmiah internasional Fulltext: 81.pdf (55.22KB; 0 download) Abstract A framework on orchid flower evolution has been proposed based on three different findings and their resultant implications. (i) The general occurrence of semipeloric natural orchid mutants suggest a common underlying genetic mechanism. (ii) The phenotypic expressions of both wild-type orchids and the semipeloric mutants can be explained by the ABC model of flower development and the polar coordinate model for zygomorphy which explains the phenotypic expression of flower symmetry in wild type and semipeloric flowers of Antirrhinum by the CYCLOIDEA, CYC gene. Similarly, the presence of such a similar gene in orchids CYCLOIDEA like, CYC-L gene has already been proposed (iii) The origin of three evolutionarily distant column types (e.g. triandrous, diandrous and monandrous) of orchids representing different sub-families too can be explained with these models suggesting the presence of three different homologues of CYC-L gene within the Orchidaceae. These findings and implications suggest that the orchid flowers might have evolved through the quantum evolution of CYC-L gene from their lily-like ancestors. Further experiments for verification of the phenomenon have been suggested. Opini Anda Klik untuk menuliskan opini Anda tentang koleksi ini! Lihat Sejarah Pengadaan  Konversi Metadata   Kembali

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