Disruption of endosperm development is a major cause of hybrid seed inviability between Mimulus guttatus and M. nudatus

Oneal, Elen; Willis, John H.; Franks, Robert G.

doi:10.1101/029223

Cited by 12 publications

(27 citation statements)

References 11 publications

(16 reference statements)

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“…In previous studies focused on barriers between species in sympatry, prezygotic barriers including ecological diff erentiation ( Martin and Willis, 2007 ), diff erences in fl owering phenology ( Kenney and Sweigart, 2016 ), fl oral morphology ( Grossenbacher and Whittall, 2011 ), pollinator preference ( Kay and Sargent, 2009 ;Dell'Olivo et al, 2011 ;Whitehead and Peakall, 2014 ;Sheehan et al, 2016 ), and pollen-pistil interactions ( Rieseberg et al, 1995 ;Carney et al, 1996 ;Klips, 1999 ;Pellegrino et al, 2010 ) predominated. However, postzygotic barriers can also play an important role in the isolation of sympatric species ( Costa et al, 2007 ;Jewell et al, 2012 ;Oneal et al, 2016 ).…”

Section: Discussionmentioning

confidence: 99%

“…6 ; Appendices S7 and S8). In angiosperms, arrest in early embryo development is commonly associated with endosperm failure in interploidy or interspecifi c crosses ( Cooper and Brink, 1945 ;Nowack et al, 2010 ;Ishikawa et al, 2011 ;Oneal et al, 2016 ). Th e molecular mechanisms underlying defects in hybrid seed development, including both genic incompatibilities and epigenetic eff ects, are under active investigation in numerous plant species ; Josefsson et al, 2006 ;Marfil et al, 2006 ;Bomblies et al, 2007 ;Michalak, 2009 ;Ng et al, 2012 ;Shivaprasad et al, 2012 ;Köhler, 2015 , 2016 ).…”

Section: Discussionmentioning

confidence: 99%

“…Postzygotic barriers that interfere with seed development or seed germination also restrict hybridization ( Cooper and Brink, 1945 ;Scopece et al, 2008 ;Burkart-Waco et al, 2012 ;Ng et al, 2012 ;Baack et al, 2015 ;Lafon-Placette and Köhler, 2015 ;Oneal et al, 2016 ). Even if hybrid seeds germinate, hybrid lethality, necrosis ( Sawant, 1956 ;Ramsey et al, 2003 ;Bomblies et al, 2007 ;Yamamoto et al, 2010 ), or sterility due to pollen inviability are oft en observed, ultimately preventing hybrid persistence ( Henderson et al, 1959 ;Grant, 1971 ;Rieseberg et al, 1999 ;Fishman and Willis, 2001 ;Moyle and Graham, 2005 ;Sweigart et al, 2006 ;Kubo et al, 2008 ;Bomblies, 2010 ).…”

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confidence: 99%

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Interspecific reproductive barriers between sympatric populations of wild tomato species (Solanum section Lycopersicon)

Baek

Royer

Broz

et al. 2016

American J of Botany

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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Interspecific reproductive barriers between sympatric populations of wild tomato species (Solanum section Lycopersicon)

Baek

Royer

Broz

et al. 2016

American J of Botany

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“…The two monkeyflower species exhibit strong reproductive interference in the field. Over 99% of hybrid seeds produced from crosses between these species are shriveled or flat due to arrested endosperm development, and very rarely germinate (Gard-ner and Macnair 2000;Oneal et al 2016). When transplanted into the opposite habitat, hybridization strongly reduces immigrant fitness.…”

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confidence: 99%

Inbreeding depression contributes to the maintenance of habitat segregation between closely related monkeyflower species

2021

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Incompletely reproductively isolated species often segregate into different microhabitats, even when they are able to survive and reproduce in both habitats. Longer term evolutionary factors may contribute to this lack of cross‐habitat persistence. When reproductive interference reduces immigrant fitness, assortative mating, including self‐fertilization, increases immigrants’ fitness in a single generation, but longer term, inbreeding depression may reduce the chance of population persistence. Two California monkeyflower species repeatedly segregate into drier and wetter areas in their zone of sympatry. To test whether inbreeding depression may contribute to the maintenance of this segregation pattern, we transplanted outbred and successively inbred Mimulus guttatus and Mimulus nudatus into their native habitats and heterospecific habitats. We measured germination, survival, and seed set and found that recurrent selfing reduced all aspects of fitness in both species, most strongly in foreign habitats. A simulation model, parameterized from the transplant experiment, found that inbreeding reduced fitness to such an extent that sequentially inbred populations of either species would be unable to persist in heterospecific‐occupied habitats in the absence of continued gene flow. These results demonstrate that individual immigrants are unlikely to form persistent populations and thus, inbreeding depression contributes to the absence of fine‐scale coexistence in this species pair.

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“…Seed abortion is common in most flowering plants and is considered a potentially beneficial mechanism for improving the quality of offspring (Burd, 1998;Arathi et al, 1999;Miyajima et al,2003;Satoki et al, 2009;Meyer et al, 2014;Oneal et al, 2016;. However, the mechanism of abortion severely restricts the proliferation, breeding, introduction, and conservation of endangered species.…”

Section: Introductionmentioning

confidence: 99%

Abortion occurs during double fertilisation and ovule development inPaeonia ludlowii

Chen

Xie

Jiang

et al. 2021

Preprint

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Paeonia ludlowii, a rare and endangered species, is indigenous to Tibet, China and propagated only by seed. Its natural reproduction is constrained by low fecundity. Excess seed abortion is a key factor restricting its natural reproduction, cultivation, introduction, and protection. In this study, we examined the characteristics of aborted ovules, developmental differences after flowering of normal and aborted ovules, and their ratios at different positions in P. ludlowii ovary. During pollination, fertilisation, and seed development, ovule abortion was frequent, with a random abortion position. There were four types of abortion, namely, abnormal pistil, sterile ovules, abnormal embryo sac, embryo and endosperm abortions. Of these, embryo and endosperm abortions could be divided into early abortion, middle abortion, and late abortion. The early aborted ovules stopped growing on day 12, the endoblast and endosperm in the embryo sac aborted gradually. Furthermore, the shape of the embryo sac cavity changed. The volume of aborted ovules was significantly different from that of fertile ovules. At ripening, the external morphology of different types of aborted seeds was significantly different.

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Disruption of endosperm development is a major cause of hybrid seed inviability between Mimulus guttatus and M. nudatus

Cited by 12 publications

References 11 publications

Interspecific reproductive barriers between sympatric populations of wild tomato species (Solanum section Lycopersicon)

Interspecific reproductive barriers between sympatric populations of wild tomato species (Solanum section Lycopersicon)

Inbreeding depression contributes to the maintenance of habitat segregation between closely related monkeyflower species

Abortion occurs during double fertilisation and ovule development inPaeonia ludlowii

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