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8 results for “Polascontria”
FIGURE 1. Diagnostic characters among the taxa studied. A−C in ×Polascontria (Cactaceae), a nothogenus that represents the gene flow between Escontria and Polaskia
FIGURE 1. Diagnostic characters among the taxa studied. A−C: fruits, D−F: flowers, G−I: areoles on the stems, J−L: ribs of stems (Escontria chiotilla in the first column, natural hybrids in the second one, P. chichipe in the third column). A. Fruits of E. chiotilla (triangular, largest and papiraceous bracts - white arrow). B. Fruits of hybrids [papiraceous, short and broad, but not triangular bracts (white arrow), and spines (yellow arrow)]. Hybrids form normal fruits with seeds (in the left). Some fruits are abortive and smaller in the same individual hybrid (in the right). C. Fruits of P. chichipe (spines - yellow arrow). D. Flowers of E. chiotilla (yellowish and with triangular and large papiraceous bracts forming tubular to funnel shape with not revolute tepals). E. Flowers of the hybrid (shorter bracts than those of E. chiotilla, tepals are scarce, creamy and not revolute, but are more extended than in E. chiotilla). F. Flowers of P.chichipe (with spines but not bracts and tepals revolute and yellowish-green coloured). G. The stem of natural hybrids is similar in color, branch number and areole shape to those of E. chiotilla (H) and P. chichipe (I). J. Each stem branch in E. chiotilla has seven ribs as those of hybrid individuals (K), whereas P. chichipe can have up to nine ribs (L).
FIGURE 5. A in ×Polascontria (Cactaceae), a nothogenus that represents the gene flow between Escontria and Polaskia
FIGURE 5. A. UPGMA dendrogram based on Jaccard´s similarity coefficient based on molecular markers: three major clusters are generated (E. chiotilla, P. chichipe and hybrids). B. UPGMA dendrogram obtained from DNA markers of hybrids based on Jaccard´s similarity coefficient: two main groups are formed (artificial hybrids, and natural hybrids).
FIGURE 4 in ×Polascontria (Cactaceae), a nothogenus that represents the gene flow between Escontria and Polaskia
FIGURE 4. PCoA scatter plots based on molecular markers: A. Distribution of Escontria chiotilla, Polaskia chichipe and the four natural hybrids. B. Analysis including the natural hybrids and the hybrid 1 progeny. E = E. chiotilla, P = P. chichipe, H = Hybrids.
FIGURE 6 in ×Polascontria (Cactaceae), a nothogenus that represents the gene flow between Escontria and Polaskia
FIGURE 6. Illustration of ×Polascontria huajuapensis. A. Plant habit. B. Branch. C. Branch in cross section. D. Areole. E. Bracts with areoles on fruits. F. Floral dissection. G. Flower (apical view). H. Bud flower with bracts. I. Fruit [drawing (from herbarium specimens: Cruz-González 1 (MEXU), vouchers 1025386, 1025387 1040183 (MEXU), and photographs by the authors)].
FIGURE 2 in ×Polascontria (Cactaceae), a nothogenus that represents the gene flow between Escontria and Polaskia
FIGURE 2. Pollen micromorphology of Polaskia chichipe, Escontria chiotilla and hybrids. A, D, G and J: E. chiotilla; B, E, H and K: hybrids; C, F, I and L: P. chichipe. A. Seeds of E. chiotilla (oval, black-brown and rugose seeds with smaller cells toward hilum forming a spanded border as those of hybrids). B‒C. Seeds of P. chichipe (oval, black-brown, but ruminate, with interstices cratered, the cells close hilum are smaller and form a spanded border around it). D. Cuticle of seeds in E. chiotilla [striate as in hybrids (E, top), although some hybrids produce some seeds with irregular striations on seed coat, specially forming cuticles thickness extended and hardly visible between cells walls, mainly on lateral regions (E, bottom)]. F. Cuticle in P. chichipe (striate). Pollen grains in E. chiotilla (G), hybrids (H, upper) and P. chichipe (I) (spheroidal, radiosymetric and tricolpate). The exine in all taxa is tectate, perforate and spinulose (J−L). The aperture membrane is granular (K). The hybrids produce several non-viable pollen grains that are empty and collapsed (H, in the bottom). Scales are: A, B and C=500 μm; D, E (in the top) and F=100 μm, E (in the bottom) =10 μm; G, H (in the top and in the bottom) and I= 10 μm; J, K and L= 1μm.
FIGURE 3. A in ×Polascontria (Cactaceae), a nothogenus that represents the gene flow between Escontria and Polaskia
FIGURE 3. A. PCA referred to Escontria chiotilla, Polaskia chichipe and natural hybrid. Variance accumulate on the first two axes = 68.86% (axis 1= 56.84%, axis 2 = 12.02%). E = E. chiotilla, P = P. chichipe, H = natural hybrids. B. UPGMA dendrogram based on Jaccard´s similarity coefficient. Asimilarity coefficient for the first two main clusters (E. chiotilla and P. chichipe/hybrid) is -0.51.
FIGURE 8 in ×Polascontria (Cactaceae), a nothogenus that represents the gene flow between Escontria and Polaskia
FIGURE 8. Photos of ×Polascontria huajuapensis (voucher 1040183, MEXU).
FIGURE 7 in ×Polascontria (Cactaceae), a nothogenus that represents the gene flow between Escontria and Polaskia
FIGURE 7. Specimen of ×Polascontria huajuapensis (holotype: voucher 1025387, MEXU).
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