Limits...
Evidence for asymmetrical hybridization despite pre- and post-pollination reproductive barriers between two Silene species

View Article: PubMed Central - PubMed

ABSTRACT

Co-flowering species may undergo interspecific hybridization if they are closely related and share pollinators. However, a series of reproductive barriers between species can prevent interspecific gene flow, making natural hybridization a transient, rare event. Both morphological and molecular data indicated putative natural hybrids between two Silene species from southwest China, with pollen from S. yunnanensis fertilizing ovules of S. asclepiadae. Zhang et al. found that pollen production and viability were significantly lower in putative hybrids than the parental species. The low fecundity of the hybrids and other reproductive barriers between the two species could contribute to species fidelity.

No MeSH data available.


Reproductive parameters (means ± SE) for S. asclepiadea, hybrid and S. yunnanensis, including (a) pollen numbers, (b) viable pollen numbers, (c) ovule numbers and (d) viable P/O. Bars with different letters differ significantly (P < 0.05).
© Copyright Policy - creative-commons
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4940505&req=5

plw032-F7: Reproductive parameters (means ± SE) for S. asclepiadea, hybrid and S. yunnanensis, including (a) pollen numbers, (b) viable pollen numbers, (c) ovule numbers and (d) viable P/O. Bars with different letters differ significantly (P < 0.05).

Mentions: Pollen counts between S. asclepiadae and S. yunnanensis were not significantly different but were significantly higher than those of hybrids (F2, 87 = 30.14, P < 0.01); Fig. 7a. Similarly, the number of viable pollen grains per flower was not significantly different between parental species but hybrids produced significantly fewer, <20 % as many viable pollen grains (F2, 87 = 114.41, P < 0.01) (Fig. 7b). The number of ovules per bud was not significantly different among the three flower types (F2, 87 = 1.30, P = 0.278) (Fig. 7c). Because pollen production but not ovule production was reduced in hybrids, both pollen:ovule ratios (F2, 87 = 271.67, P < 0.01) and viable pollen:ovule ratios in hybrids (F2, 87 = 107.60, P < 0.01) were significantly lower compared with the parental species (Fig. 7d).Figure 7.


Evidence for asymmetrical hybridization despite pre- and post-pollination reproductive barriers between two Silene species
Reproductive parameters (means ± SE) for S. asclepiadea, hybrid and S. yunnanensis, including (a) pollen numbers, (b) viable pollen numbers, (c) ovule numbers and (d) viable P/O. Bars with different letters differ significantly (P < 0.05).
© Copyright Policy - creative-commons
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4940505&req=5

plw032-F7: Reproductive parameters (means ± SE) for S. asclepiadea, hybrid and S. yunnanensis, including (a) pollen numbers, (b) viable pollen numbers, (c) ovule numbers and (d) viable P/O. Bars with different letters differ significantly (P < 0.05).
Mentions: Pollen counts between S. asclepiadae and S. yunnanensis were not significantly different but were significantly higher than those of hybrids (F2, 87 = 30.14, P < 0.01); Fig. 7a. Similarly, the number of viable pollen grains per flower was not significantly different between parental species but hybrids produced significantly fewer, <20 % as many viable pollen grains (F2, 87 = 114.41, P < 0.01) (Fig. 7b). The number of ovules per bud was not significantly different among the three flower types (F2, 87 = 1.30, P = 0.278) (Fig. 7c). Because pollen production but not ovule production was reduced in hybrids, both pollen:ovule ratios (F2, 87 = 271.67, P < 0.01) and viable pollen:ovule ratios in hybrids (F2, 87 = 107.60, P < 0.01) were significantly lower compared with the parental species (Fig. 7d).Figure 7.

View Article: PubMed Central - PubMed

ABSTRACT

Co-flowering species may undergo interspecific hybridization if they are closely related and share pollinators. However, a series of reproductive barriers between species can prevent interspecific gene flow, making natural hybridization a transient, rare event. Both morphological and molecular data indicated putative natural hybrids between two Silene species from southwest China, with pollen from S. yunnanensis fertilizing ovules of S. asclepiadae. Zhang et al. found that pollen production and viability were significantly lower in putative hybrids than the parental species. The low fecundity of the hybrids and other reproductive barriers between the two species could contribute to species fidelity.

No MeSH data available.