Can obligate apomixis and more stable reproductive assurance explain the distributional successes of asexual triploids inHieracium alpinum(Asteraceae)?

Plant Biology ◽  
2018 ◽  
Author(s):  
P. Mráz ◽  
P. Zdvořák ◽  
M. Hartmann ◽  
M. Štefánek ◽  
J. Chrtek
Keyword(s):  
Reproductive Assurance ◽  
Obligate Apomixis

Characteristics of Obligate Apomixis in Dandelion (Taraxacum antungense)

2014 ◽  
Vol 49 (4) ◽  
pp. 417 ◽  
Author(s):  
Ning Wei ◽  
Zhang Jian ◽  
Wu Zhigang ◽  
Ma Ming ◽  
Zhao Xin ◽  
...  
Keyword(s):  
Obligate Apomixis

scholarly journals What ecological factors favor the shift from distyly to homostyly? A study from the perspective of reproductive assurance

2017 ◽  
Vol 11 (4) ◽  
pp. 645-655 ◽  
Author(s):  
Xian-Feng Jiang ◽  
Xing-Fu Zhu ◽  
Ling-Ling Chen ◽  
Qing-Jun Li
Keyword(s):  
Ecological Factors ◽  
Reproductive Assurance

Reproductive success of Acacia longifolia (Fabaceae, Mimosoideae) in native and invasive populations

2015 ◽  
Vol 63 (5) ◽  
pp. 387 ◽  
Author(s):  
Marta Correia ◽  
Sílvia Castro ◽  
Susana Rodríguez-Echeverría
Keyword(s):  
Reproductive Success ◽  
Seed Size ◽  
Fruit Set ◽  
Lower Number ◽  
Open Pollination ◽  
Native Range ◽  
Reproductive Assurance ◽  
Acacia Species ◽  
Self Compatibility ◽  
Selfing Ability

The reproductive biology of exotic species affects their capacity to become naturalised and invasive in non-native areas. Selfing is a common trait in many invasive plants probably because it provides reproductive assurance under low availability of pollination vectors and sexual partners. Nonetheless, the predominantly self-incompatible Australian Acacia species are among the most aggressive plants worldwide. To address whether there have been changes in selfing ability and natural reproductive success of A. longifolia during invasion, we compared one population in the invaded area (Portugal) with one population in the native range (Australia). We specifically assessed floral traits, fruit set and offspring traits for selfing and open-pollination treatments. Within each pollination treatment, no differences were found between areas, suggesting that the level of self-compatibility has not changed during invasion. However, the number of aborted seeds and seed size were significantly different between pollination treatments in Australia but not in Portugal. There were significant differences in the number of seeds per pod and in seed weight between ranges. A lower number of aborted seeds, a higher number of fully developed seeds and a greater seed size were found in the invaded area for both pollination treatments. In spite of the low selfing ability of A. longifolia in the invaded area, there was an increase in the quantity and size of the seeds produced in the new region, even for self-pollinated fruits, which might contribute to A. longifolia invasiveness.

scholarly journals Dynamics of apomictic and sexual reproduction during primary succession on a glacier forefield in the Swiss Alps

2019 ◽  
Author(s):  
Christian Sailer ◽  
Jürg Stöcklin ◽  
Ueli Grossniklaus
Keyword(s):  
Genetic Diversity ◽  
Gene Flow ◽  
Primary Succession ◽  
Swiss Alps ◽  
Reproductive Assurance ◽  
Glacier Forefield ◽  
Early Stages ◽  
Hieracium Pilosella ◽  
Baker’S Law ◽  
Successional Stages

AbstractApomixis, the asexual reproduction through seeds, is thought to provide reproductive assurance when ploidy is not even and/or when population density is low. Therefore, apomicts are expected to be more abundant, and the frequency of apomictic offspring higher, at early stages of primary succession when mates are rare.To test this hypothesis, we sampled facultative apomictic Hieracium pilosella L. along the successional gradient on a glacier forefield and determined their ploidy, the level of apomixis in their offspring, and the genetic diversity of the entire meta-population and within subpopulations.We found that apomixis is more common in odd- and aneuploid cytotypes, which are more frequent at early stages of primary succession. However, apomixis was uncommon at all successional stages and sexual hexaploids were dominating throughout. Reproductive assurance was reflected in the higher fertility of all odd-ploid apomictic plants (3x, 5x) by avoiding meiosis, illustrating that apomixis provides an escape from sterility, as proposed by Darlington. Odd-ploid plants are supposedly better colonizers (Baker’s law), which is supported by their higher occurrence close to the glacier snout. Independent of succession, we found gene flow between apomicts and sexuals, which allows for the continuous creation of new apomictic and sexual genotypes.We conclude that apomixis in H. pilosella does indeed provide an escape from sterility, and therefore reproductive assurance, in aneuploid cytotypes. We further propose that apomixis preserves beneficial combinations of unlinked alleles in every generation for as long as apomictic genotypes persist in the population.

ALLEE EFFECT AND SELF-FERTILIZATION IN HERMAPHRODITES: REPRODUCTIVE ASSURANCE IN A STRUCTURED METAPOPULATION

Evolution ◽  
2008 ◽  
Vol 62 (10) ◽  
pp. 2558-2569 ◽  
Author(s):  
Antoine Dornier ◽  
François Munoz ◽  
Pierre-Olivier Cheptou
Keyword(s):  
Allee Effect ◽  
Reproductive Assurance ◽  
Self Fertilization ◽  
Structured Metapopulation
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