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Dormancy Breaking Treatments in Northern Wild Rice (Zizania palustris L.) Seed Suggest a Physiological Source of Dormancy
bioRxiv - Plant Biology Pub Date : 2021-09-11 , DOI: 10.1101/2021.09.10.459785
Lillian McGilp , Aaron Semington , Jennifer Kimball

Dormancy is a limiting factor for breeding in northern wild rice (NWR; Zizania palustris L). This study developed a dormancy curve and tested a combination of scarification and hormone treatments, across three timepoints, for their ability to break dormancy in NWR and produce viable seedlings and plants. A dormancy curve was established across 9 months post-harvest, which showed maximum germination (95%) by 17 weeks post-harvest and high germination (≥81 %) through the rest of the testing period. Next, dormancy breaking treatments were tested. At 1 week post-harvest, few seeds germinated (≤ 15 %) across all treatment combinations. However, sulfuric acid increased germination shortly after harvest (5.8 %), compared to water (0.5 %) and NaClO (0 %) but resulted in stunted seedlings, all but one of which died shortly thereafter. At 7 weeks, sulfuric acid treated seeds did not result in significantly higher germination than water and maximum germination was still below 15%. By 11 weeks post-harvest, the water treatments had the highest germination and resulted in the most viable plants, indicating that dormancy had begun to break naturally and exceeded the effect of the other scarification treatments. Hormonal treatments had no significant effect on germination or seed viability and no strong conclusions could be drawn about their effect on seedling or plant health. Due to the inability of early germinated seed to consistently produce viable plants and the increase in germination following sufficient cold storage, it is likely that NWR seed has intermediate or deep physiological dormancy.

中文翻译:

北方野生稻(Zizania palustris L.)种子的休眠破坏处理表明休眠的生理来源

休眠是北方野生稻育种的限制因素(NWR;Zizania palustrisL)。该研究开发了休眠曲线,并测试了三个时间点的划痕和激素处理组合,以了解它们在 NWR 中打破休眠并产生可行的幼苗和植物的能力。在收获后 9 个月内建立了休眠曲线,在收获后 17 周显示最大发芽率 (95%) 和在其余测试期间的高发芽率 (≥81%)。接下来,测试了休眠打破处理。在收获后 1 周,所有处理组合中几乎没有种子发芽 (≤ 15 %)。然而,与水 (0.5 %) 和 NaClO (0 %) 相比,硫酸在收获后不久增加了发芽率 (5.8 %),但导致幼苗发育不良,除其中一株外,所有幼苗均在此后不久死亡。在第 7 周时,硫酸处理的种子没有导致比水显着更高的发芽率,并且最大发芽率仍然低于 15%。到收获后 11 周时,水处理的发芽率最高,植株存活率最高,这表明休眠已开始自然打破,并超过了其他松土处理的效果。激素处理对发芽或种子活力没有显着影响,并且无法得出关于它们对幼苗或植物健康的影响的有力结论。由于早期发芽的种子无法始终如一地产生有活力的植物,并且在充分冷藏后发芽率增加,因此 NWR 种子很可能具有中度或深度的生理休眠。水处理的发芽率最高,产生的植物存活率最高,表明休眠已开始自然打破,超过了其他松土处理的效果。激素处理对发芽或种子活力没有显着影响,并且无法得出关于它们对幼苗或植物健康的影响的有力结论。由于早期发芽的种子无法始终如一地产生有活力的植物,并且在充分冷藏后发芽率增加,因此 NWR 种子很可能具有中度或深度的生理休眠。水处理的发芽率最高,产生的植物存活率最高,表明休眠已开始自然打破,超过了其他松土处理的效果。激素处理对发芽或种子活力没有显着影响,并且无法得出关于它们对幼苗或植物健康的影响的有力结论。由于早期发芽的种子无法始终如一地产生有活力的植物,并且在充分冷藏后发芽增加,因此 NWR 种子很可能具有中度或深度的生理休眠。激素处理对发芽或种子活力没有显着影响,并且无法得出关于它们对幼苗或植物健康的影响的有力结论。由于早期发芽的种子无法始终如一地产生有活力的植物,并且在充分冷藏后发芽率增加,因此 NWR 种子很可能具有中度或深度的生理休眠。激素处理对发芽或种子活力没有显着影响,并且无法得出关于它们对幼苗或植物健康的影响的有力结论。由于早期发芽的种子无法始终如一地产生有活力的植物,并且在充分冷藏后发芽率增加,因此 NWR 种子很可能具有中度或深度的生理休眠。
更新日期:2021-09-13
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