Abstract
Lycoris , a perennial bulbous flower species, is valued for ornamental features and abundant medicinal ingredients. The reproductive development features of Lycoris , especially meiosis, remain largely uncharacterized, which hinders its breeding programs. However, the references for investigating meiosis in Lycoris are limited at present. In addition, a special reproductive trait of Lycoris that typically differs from other species is that its meiosis occurs in bulbs underground, which increases the difficulties in cytological dissection of sexual cells. In this study, we analyzed meiotic chromosome behaviors in two diploid Lycoris species ( L. sp rengeri and L. aurea ) and two naturally-derived allotriploid varieties ( L. chunxiaoensi and L. hubeiensis ). The correlation of anther size and the stage of meiosis was determined, which revealed differences between diploid species. Diploid Lycoris showed defects in chromosome segregation, indicating that meiosis in Lycoris is unstable. Meiotic restitution, which defines non-reductional meiosis events, was observed in both diploid species, implying a potential to yield unreduced gametes and thus may explain the natural derivation of polyploids. Immunolocalization of the recombinase HEI10 revealed that L. sp rengeri and L. aurea have similar class-I type crossover rates. Moreover, we showed that allotriploid Lycoris exhibit severely disrupted chromosome pairing and bivalent formation, the levels of which varied between varieties. These meiotic defects leaded to aneuploid meiotic products and sterility. Taken together, this study provides a cytological reference and insights into meiosis features in Lycoris , which paves a rode for further studies on reproductive biology and genetics in this special bulbous flower species.
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Claims 6
Claim · model-written summary
Anther size correlated with meiotic stage differently in the diploid species.
Not reportedTaxonDirection
Verbatim
e0“The correlation of anther size and the stage of meiosis was determined, which revealed differences between diploid species”
Claim · model-written summary
Diploid Lycoris showed chromosome segregation defects.
LycorisNot reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Diploid Lycoris showed defects in chromosome segregation”
Claim · model-written summary
Both diploid species showed meiotic restitution.
Not reportedTaxonDirection
Verbatim
e0“Meiotic restitution, which defines non-reductional meiosis events, was observed in both diploid species”
Claim · model-written summary
L. sp rengeri and L. aurea had similar class-I crossover rates.
Not reportedMaterialGene
Verbatim
e0“L. sp rengeri and L. aurea have similar class-I type crossover rates”
Claim · model-written summary
Allotriploid Lycoris showed disrupted pairing and bivalent formation that varied among varieties.
- Material
- allotriploid Lycorise0
- Outcome
- chromosome pairing and bivalent formatione0
- Direction
- disruptede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“allotriploid Lycoris exhibit severely disrupted chromosome pairing and bivalent formation, the levels of which varied between varieties”
Claim · model-written summary
Meiotic defects produced aneuploid products and sterility.
Not reportedTaxonDirection
Verbatim
e0“These meiotic defects leaded to aneuploid meiotic products and sterility”