Magnolia sect. Macrophylla

Núñez, Fabián Augusto Aldaba, Guzmán-Díaz, Salvador, Park, Suhyeon, Kim, Sangtae, Salas, Esteban Manuel Martínez & Samain, Marie-Stéphanie, 2025, Unravelling the Mexican Magnolia dealbata (Magnoliaceae) species complex, Phytotaxa 684 (1), pp. 1-32 : 15

Magnolia sect. Macrophylla plastome features and variations

Variations of plastomes between different taxa of the Magnolia sect. Macrophylla were minimal ( Figures 2 , 4 ), underscoring the overall conservation of the Magnolia sect. Macrophylla and Magnolia plastome ( Guzmán-Díaz et al. 2022; Palmer 1985). Moreover, there were important and noticeable differences between the taxa from the Magnolia sect. Macrophylla and M. fraseri ( Magnolia sect. Auriculata ), confirming, in a molecular way, that they are indeed completely distinct lineages and clades.

In particular, among the taxa of the Magnolia dealbata complex, the two samples that differed most from the rest were M. vovidesii MA 0877A and the one corresponding to M. zotictla . For the former, the variations recorded in comparison with the other two samples of M. vovidesii could be explained by the fact that this sample comes from a different population than the rest of M. vovidesii , or that it inhabits a different ecosystem, so these variations are a response to the habitat or simply related to the individual itself. However, variations in plastomes can be the result of many other causes, including random mutations or genetic drift ( Cao et al. 2024; Chen et al. 2021; Dong et al. 2023; Du et al. 2022).

Figures

FIGURE 2. Mauve progressive alignment, including all 14 North American Magnolia taxa plastomes. Blocks of the same colour linked by a line represent colinear regions. Blocks below the graphs represent coding regions.

FIGURE 4. Comparison and visualization of the inverted repeat (IR), small single copy (SSC) and large single copy (LSC) sequences boundary positions in the 14 North America Magnolia plastomes.