Pollen competition between morphs in a pollen-color dimorphic herb and the loss of phenotypic polymorphism within populations

Evolution ◽  
2018 ◽  
Vol 72 (4) ◽  
pp. 785-797 ◽  
Author(s):  
Xiao-Yue Wang ◽  
Qiu-Mei Quan ◽  
Bo Wang ◽  
Yun-Xiang Li ◽  
Shuang-Quan Huang
Keyword(s):  
Pollen Competition ◽  
Phenotypic Polymorphism ◽  
Pollen Color

scholarly journals A High-Density EST-SSR-Based Genetic Map and QTL Analysis of Dwarf Trait in Cucurbita pepo L.

2018 ◽  
Vol 19 (10) ◽  
pp. 3140 ◽  
Author(s):  
Chenggang Xiang ◽  
Ying Duan ◽  
Hongbo Li ◽  
Wei Ma ◽  
Sanwen Huang ◽  
...  
Keyword(s):  
Genetic Map ◽  
Simple Sequence Repeats ◽  
Cucurbita Pepo ◽  
Economic Value ◽  
High Density ◽  
Oxidase Gene ◽  
Phenotypic Polymorphism ◽  
The Rich ◽  
Expressed Sequence ◽  
Simple Sequence

As one of the earliest domesticated species, Cucurbita pepo (including squash and pumpkin) is rich in phenotypic polymorphism and has huge economic value. In this research, using 1660 expressed sequence tags-simple sequence repeats (EST-SSRs) and 632 genomic simple sequence repeats (gSSRs), we constructed the highest-density EST-SSR-based genetic map in Cucurbita genus, which spanned 2199.1 cM in total and harbored 623 loci distributed in 20 linkage groups. Using this map as a bridge, the two previous gSSR maps were integrated by common gSSRs and the corresponding relationships around chromosomes in three sets of genomes were also collated. Meanwhile, one large segmental inversion that existed between our map and the C. pepo genome was detected. Furthermore, three Quantitative Trait Loci (QTLs) of the dwarf trait (gibberellin-sensitive dwarf type) in C. pepo were located, and the candidate region that covered the major QTL spanned 1.39 Mb, which harbored a predicted gibberellin 2-β-oxidase gene. Considering the rich phenotypic polymorphism, the important economic value in the Cucurbita genus species and several advantages of the SSR marker were identified; thus, this high-density EST-SSR-based genetic map will be useful in Pumpkin and Squash breeding work in the future.

In Vitro Germination of Eucalyptus Pollen: Response to Variation in Boric Acid and Sucrose

1989 ◽  
Vol 37 (5) ◽  
pp. 429 ◽  
Author(s):  
BM Potts ◽  
JB Marsden-Smedley
Keyword(s):  
Pollen Tube ◽  
Boric Acid ◽  
Pollen Tube Growth ◽  
Pollen Germination ◽  
Sucrose Concentration ◽  
Response Surfaces ◽  
Tube Growth ◽  
Pollen Competition

The effect of boric acid (0-450 ppm) and sucrose (0-40%) on pollen germination and pollen tube growth in Eucalyptus globulus, E. morrisbyi, E. ovata and E. tirnigera was examined in vitro. Over the con- centrations tested, sucrose had by far the largest effect upon both pollen germination and tube lengths. The optimum sucrose concentration for pollen germination (30%) and pollen tube growth (20%) differed markedly with very little (<lo%) germination occurring in the absence of sucrose. The interaction of sucrose and boric acid was significant. However, in general both pollen germination and pollen tube growth were increased by the addition of up to 100 ppm boric acid, but above this level the response plateauxed. The four species differed significantly in their pattern of response to both boric acid and sucrose and the predicted optima derived from analysis of response surfaces differed between species. The predicted sucrose concentration for optimal germination and growth of E. urnigera pollen was consistently less than the other species and in terms of the optimal level of boric acid for pollen tube growth species can be ranked in the order E. globulus > E. ovata > E. morrisbyi = E. urnigera. Pollen germination and tube growth of all four species on a medium comprising 20% sucrose and 200 ppm boric acid would not differ significantly from the observed maximum response of each species and this could suffice as a generalised medium. However, if only percentage germination is to be assessed 30% sucrose would be preferable. It is argued that subtle interspecific differences in optimal in vitro con- ditions for pollen germination and pollen tube growth are likely to reflect differences in pollen physiology which in vivo may have important implications for the success of hybridisation where pollen competition occurs.

Interspecific Pollen Competition and Reproductive Isolation in Iris

1993 ◽  
Vol 84 (1) ◽  
pp. 13-16 ◽  
Author(s):  
M. L. Arnold ◽  
J. L. Hamrick ◽  
B. D. Bennett
Keyword(s):  
Reproductive Isolation ◽  
Pollen Competition
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