ArticlePlanta2025
Mechanism of thermodormancy induction in Fraxinus mandshurica seeds is related to changes in the endosperm.
Article in Planta, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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10 authors.
Funding
Abstract
Does thermodormancy impact the embryo and/or the endosperm? The seed-embryo replacement method was used to determine the mechanism of thermodormancy induction in the endospermic seeds of Fraxinus mandshurica. Germination of "new seeds" after seed embryo replacement (thermodormant embryo + non-dormant endosperm, non-dormant embryo + thermodormant endosperm, thermodormant embryo + thermodormant endosperm, non-dormant embryo + non-dormant endosperm) was compared. Germination of isolated embryos in exogenous hormones and endosperm extracts, endosperm cell wall-degrading enzyme activity, and endosperm hormone content were measured. Endosperm transcriptome of non-dormant and thermodormant seeds was determined using RNA-Seq sequencing technology. The embryos of non-dormant seeds and thermodormant seeds were not dormant, and germination of embryos isolated from them was the same. The twofold dilution of endosperm extract significantly inhibited embryos growth of non-dormant and thermodormant seeds, while the germination percentage (GP) was lower than 15%. Regardless of whether the embryo of the "new seed" came from a thermodormant or non-dormant seed, the GP of the "new seed" was higher if the endosperm came from a non-dormant seed (80 and 84%, respectively). However, if the endosperm came from a thermodormant seed, GP of the new seed with an embryo from a thermodormant or non-dormant seed decreased significantly (64 and 66%, respectively). The activity of cell wall-degrading enzymes in radicle-end endosperm of thermodormant seeds was lower than that in non-radicle-end endosperm, and the activity of enzyme in radicle-end endosperm of seeds decreased significantly after cultivating for more than 5 days at high temperature (HT). ABA content in endosperm increased significantly, GA
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