Figura 4 - uploaded by Manuel B. Crespo
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Daucus carota subsp. majoricus. A: plántula con sus primeras hojas. Escala: 1 cm. B: hoja del tercio basal. Escala: 5 cm. C: detalle de los raquis y las divisiones de una hoja. Escala: 2 cm.
Source publication
New data on the Balearic endemism Daucus carota L. subsp. majoricus A. Pujadas (Apiaceae) in the Cabrera archipelago Daucus carota L. subsp. majoricus A. Pujadas is a Balearic endemic plant which is only present in the Cabrera archipelago and west of Majorca island. This taxon belongs to the D. carota L. sensu lato group, a taxonomic aggregate that...
Contexts in source publication
Context 1
... cotiledones son estrechamente elípticos, atenuados gradualmente en un pecío- lo casi cilíndrico y delgado, completamente glabros ( fig. 3F). Las primeras hojas presentan 1-2 pares de divisiones del raquis principal ( fig. 4A). En las siguientes, es común que el número de pares de divisiones se incremente más o menos pro- gresivamente tanto en el raquis principal como en los raquis secundarios que se van desarrollando. Tanto los cotiledones como las hojas jóvenes han resultado simi- lares a los de otros táxones del complejo que están siendo estudiados en ...
Context 2
... secundarios bien definidos (presentes al menos en dos tercios del raquis principal, lo que equivale normalmente a más de 4 pares de raquis de segundo orden). A veces también se dis- tinguen raquis terciarios, al menos en la base de los raquis secundarios inferiores (fig. 4B). Se aprecia una ligera asimetría en todos los órdenes de división ( fig. ...
Context 3
... hojas del tercio inferior poseen un largo pecíolo entre la vaina y el primer nudo foliar ( fig. 4B). Su vaina suele ser densamente hirsuta por el envés, tendien- do a glabrescente en su zona central basal, con menor frecuencia glabrescente en la totalidad del envés. El margen de la vaina es abundantemente ciliado, con pelos de 1.0-2.3 mm de longitud y una densidad lineal de 6 a 12 pelos por mm ( fig. 3E). El limbo tiene un contorno ...
Context 4
... 12 pelos por mm ( fig. 3E). El limbo tiene un contorno usualmente triangular-ovado cuya longitud es inferior a 1.5 (1.7) veces su anchura. El raquis primario es hirsuto o escábrido con pelos de 0.8-1.6 mm de longitud y una densidad lineal aproximada de (1)2-5 pelos por mm. El indumento suele mantenerse similar en los raquis de órdenes sucesivos ( fig. 4C). Además, en los nudos del raquis primario se concentran numerosos pelos gruesos y más largos que los circundantes, pudiendo alcanzar los 1.5 mm de ...
Citations
... carota group. Similarly, Bolòs and Vigo [119] and Pujadas Salvà [19] considered that subsp. maritimus corresponded to subsp. ...
Background
The majority of the subspecies of Daucus carota have not yet been discriminated clearly by various molecular or morphological methods and hence their phylogeny and classification remains unresolved. Recent studies using 94 nuclear orthologs and morphological characters, and studies employing other molecular approaches were unable to distinguish clearly many of the subspecies. Fertile intercrosses among traditionally recognized subspecies are well documented. We here explore the utility of single nucleotide polymorphisms (SNPs) generated by genotyping-by-sequencing (GBS) to serve as an effective molecular method to discriminate the subspecies of the D. carota complex.
Results
We used GBS to obtain SNPs covering all nine Daucus carota chromosomes from 162 accessions of Daucus and two related genera. To study Daucus phylogeny, we scored a total of 10,814 or 38,920 SNPs with a maximum of 10 or 30 % missing data, respectively. To investigate the subspecies of D. carota, we employed two data sets including 150 accessions: (i) rate of missing data 10 % with a total of 18,565 SNPs, and (ii) rate of missing data 30 %, totaling 43,713 SNPs. Consistent with prior results, the topology of both data sets separated species with 2n = 18 chromosome from all other species. Our results place all cultivated carrots (D. carota subsp. sativus) in a single clade. The wild members of D. carota from central Asia were on a clade with eastern members of subsp. sativus. The other subspecies of D. carota were in four clades associated with geographic groups: (1) the Balkan Peninsula and the Middle East, (2) North America and Europe, (3) North Africa exclusive of Morocco, and (4) the Iberian Peninsula and Morocco. Daucus carota subsp. maximus was discriminated, but neither it, nor subsp. gummifer (defined in a broad sense) are monophyletic.
Conclusions
Our study suggests that (1) the morphotypes identified as D. carota subspecies gummifer (as currently broadly circumscribed), all confined to areas near the Atlantic Ocean and the western Mediterranean Sea, have separate origins from sympatric members of other subspecies of D. carota, (2) D. carota subsp. maximus, on two clades with some accessions of subsp. carota, can be distinguished from each other but only with poor morphological support, (3) D. carota subsp. capillifolius, well distinguished morphologically, is an apospecies relative to North African populations of D. carota subsp. carota, (4) the eastern cultivated carrots have origins closer to wild carrots from central Asia than to western cultivated carrots, and (5) large SNP data sets are suitable for species-level phylogenetic studies in Daucus.
Llistat Bibliografia Naturalística de les Balears, M-O
