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Female sterility associated with increased clonal propagation suggests a unique combination of androdioecy and asexual reproduction in populations of Cardamine amara (Brassicaceae).

Tedder A, Helling M, Pannell JR, Shimizu-Inatsugi R, Kawagoe T, van Campen J, Sese J, Shimizu KK - Ann. Bot. (2015)

Bottom Line: It was associated with a 2.4- to 2.9-fold increase in clonal propagation.This made the pollen number of female-sterile genets more than double that of hermaphrodite genets, which fulfils a condition of co-existence predicted by simple androdioecy theories.When female-sterile individuals were observed in wild androdioecious populations, their ramet frequencies ranged from 5 to 54 %; however, their genet frequencies ranged from 11 to 29 %, which is consistent with the theoretically predicted upper limit of 50 %.

View Article: PubMed Central - PubMed

Affiliation: Institute of Evolutionary Biology and Environmental Studies and Institute of Plant Biology, University of Zurich, Winterthurerstrasse 190, CH-8057, Switzerland, Department of Ecology and Evolution, University of Lausanne, Lausanne CH-1015, Switzerland, Center for Ecological Research (CER), Kyoto University, 2-509-3, Hirano, Otsu, Shiga 520-2113, Japan and Computational Biology Research Center (CBRC), National Institute of Advanced Industrial Science and Technology (AIST) Koto-ku, Tokyo, 135-0064, Japan.

No MeSH data available.


Related in: MedlinePlus

Diagram illustrating the floral traits measured in this study and the method by which phenotypic sex was determined. Flowers are viewed as a dissection. PL, pistil length; HL, herkogamy of medial stamen (stigma–mid-anther separation of the four medial stamens); HS, herkogamy of lateral stamen (stigma–mid-anther separation of the two short stamens); LMS, length of medial stamen; LLS, length of lateral stamen; VHL, virtual horizontal line used to determine phenotypic sex. If the stigma was above this line (A) the flower was assumed to be hermaphrodite. If the stigma fell below this line (B) it was assumed to be female-sterile.
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mcv006-F1: Diagram illustrating the floral traits measured in this study and the method by which phenotypic sex was determined. Flowers are viewed as a dissection. PL, pistil length; HL, herkogamy of medial stamen (stigma–mid-anther separation of the four medial stamens); HS, herkogamy of lateral stamen (stigma–mid-anther separation of the two short stamens); LMS, length of medial stamen; LLS, length of lateral stamen; VHL, virtual horizontal line used to determine phenotypic sex. If the stigma was above this line (A) the flower was assumed to be hermaphrodite. If the stigma fell below this line (B) it was assumed to be female-sterile.

Mentions: Ramets from both of the focal populations (KTP and WP) were sampled at 2-m intervals to reduce the likelihood of sampling multiple ramets within any single genet that might be connected physically; this distance was increased if patch size was continuous for >2 m. Only ramets in flower at the time of sampling were selected. Sampled flowers with a stigma below or above a virtual horizontal line (VHL; Fig. 1) formed by the two lateral anthers were classified as ‘female-sterile’ (FS) and ‘hermaphrodite’ (H), respectively. Subsets of focal ramets, used for detailed analysis of floral morphology, were marked with a stake to ensure they could be relocated for later sampling (Table 1). In the WP population, in which the morph ratio was approximately 1 : 1, 86 focal individuals were sampled randomly (April 2011). In the KTP population, where there was a minority of FS individuals, we sampled 77 (May 2009 and May 2010) ramets non-randomly to ensure relatively equal representation of the two morphs.Fig. 1.


Female sterility associated with increased clonal propagation suggests a unique combination of androdioecy and asexual reproduction in populations of Cardamine amara (Brassicaceae).

Tedder A, Helling M, Pannell JR, Shimizu-Inatsugi R, Kawagoe T, van Campen J, Sese J, Shimizu KK - Ann. Bot. (2015)

Diagram illustrating the floral traits measured in this study and the method by which phenotypic sex was determined. Flowers are viewed as a dissection. PL, pistil length; HL, herkogamy of medial stamen (stigma–mid-anther separation of the four medial stamens); HS, herkogamy of lateral stamen (stigma–mid-anther separation of the two short stamens); LMS, length of medial stamen; LLS, length of lateral stamen; VHL, virtual horizontal line used to determine phenotypic sex. If the stigma was above this line (A) the flower was assumed to be hermaphrodite. If the stigma fell below this line (B) it was assumed to be female-sterile.
© Copyright Policy - creative-commons
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4373288&req=5

mcv006-F1: Diagram illustrating the floral traits measured in this study and the method by which phenotypic sex was determined. Flowers are viewed as a dissection. PL, pistil length; HL, herkogamy of medial stamen (stigma–mid-anther separation of the four medial stamens); HS, herkogamy of lateral stamen (stigma–mid-anther separation of the two short stamens); LMS, length of medial stamen; LLS, length of lateral stamen; VHL, virtual horizontal line used to determine phenotypic sex. If the stigma was above this line (A) the flower was assumed to be hermaphrodite. If the stigma fell below this line (B) it was assumed to be female-sterile.
Mentions: Ramets from both of the focal populations (KTP and WP) were sampled at 2-m intervals to reduce the likelihood of sampling multiple ramets within any single genet that might be connected physically; this distance was increased if patch size was continuous for >2 m. Only ramets in flower at the time of sampling were selected. Sampled flowers with a stigma below or above a virtual horizontal line (VHL; Fig. 1) formed by the two lateral anthers were classified as ‘female-sterile’ (FS) and ‘hermaphrodite’ (H), respectively. Subsets of focal ramets, used for detailed analysis of floral morphology, were marked with a stake to ensure they could be relocated for later sampling (Table 1). In the WP population, in which the morph ratio was approximately 1 : 1, 86 focal individuals were sampled randomly (April 2011). In the KTP population, where there was a minority of FS individuals, we sampled 77 (May 2009 and May 2010) ramets non-randomly to ensure relatively equal representation of the two morphs.Fig. 1.

Bottom Line: It was associated with a 2.4- to 2.9-fold increase in clonal propagation.This made the pollen number of female-sterile genets more than double that of hermaphrodite genets, which fulfils a condition of co-existence predicted by simple androdioecy theories.When female-sterile individuals were observed in wild androdioecious populations, their ramet frequencies ranged from 5 to 54 %; however, their genet frequencies ranged from 11 to 29 %, which is consistent with the theoretically predicted upper limit of 50 %.

View Article: PubMed Central - PubMed

Affiliation: Institute of Evolutionary Biology and Environmental Studies and Institute of Plant Biology, University of Zurich, Winterthurerstrasse 190, CH-8057, Switzerland, Department of Ecology and Evolution, University of Lausanne, Lausanne CH-1015, Switzerland, Center for Ecological Research (CER), Kyoto University, 2-509-3, Hirano, Otsu, Shiga 520-2113, Japan and Computational Biology Research Center (CBRC), National Institute of Advanced Industrial Science and Technology (AIST) Koto-ku, Tokyo, 135-0064, Japan.

No MeSH data available.


Related in: MedlinePlus