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首页> 外文期刊>Journal of Experimental Botany >Quantifying the sensitivity of barley seed germination to oxygen, abscisic acid, and gibberellin using a population-based threshold model.
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Quantifying the sensitivity of barley seed germination to oxygen, abscisic acid, and gibberellin using a population-based threshold model.

机译：使用基于种群的阈值模型量化大麦种子萌发对氧气，脱落酸和赤霉素的敏感性。

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摘要

Barley (Hordeum vulgare L.) seeds (grains) exhibit dormancy at maturity that is largely due to the presence of the glumellae (hulls) that reduce the availability of oxygen (O) to the embryo. In addition, abscisic acid (ABA) and gibberellins (GAS) interact with O to regulate barley seed dormancy. A population-based threshold model was applied to quantify the sensitivities of seeds and excised embryos to O, ABA, and GA, and to their interactive effects. The median O requirement for germination of dormant intact barley seeds was 400-fold greater than for excised embryos, indicating that the tissues enclosing the embryo markedly limit O penetration. However, embryo O thresholds decreased by another order of magnitude following after-ripening. Thus, increases in both permeability of the hull to O and embryo sensitivity to O contribute to the improvement in germination capacity during after-ripening. Both ABA and GA had relatively small effects on the sensitivity of germination to O, but ABA and GA thresholds varied over several orders of magnitude in response to O availability, with sensitivity to ABA increasing and sensitivity to GA decreasing with hypoxia. Simple additive models of O-ABA and O-GA interactions required consideration of these O effects on hormone sensitivity to account for actual germination patterns. These quantitative and interactive relationships among O, ABA, and GA sensitivities provide insight into how dormancy and germination are regulated by a combination of physical (O diffusion through the hull) and physiological (ABA and GA sensitivities) factors.
机译：大麦（Hordeum vulgare L.）种子（谷物）在成熟时表现出休眠状态，这在很大程度上是由于存在减少了胚胎中氧气（O）利用率的软体动物（外壳）而导致的。此外，脱落酸（ABA）和赤霉素（GAS）与O相互作用，调节大麦种子的休眠。应用基于人口的阈值模型来量化种子和切除的胚胎对O，ABA和GA及其相互作用的敏感性。休眠的完整大麦种子发芽的中位O需求比切下的胚高出400倍，这表明包围胚的组织明显限制了O的渗透。但是，胚胎O的阈值在成熟后又下降了一个数量级。因此，船体对O的渗透性和胚对O的敏感性的增加都有助于后熟过程中发芽能力的提高。 ABA和GA对发芽对O的敏感性影响相对较小，但是ABA和GA阈值随O的有效性而变化了几个数量级，缺氧对ABA的敏感性增加而对GA的敏感性降低。 O-ABA和O-GA相互作用的简单加性模型需要考虑这些O对激素敏感性的影响，以说明实际的发芽模式。 O，ABA和GA敏感性之间的这些定量和交互关系提供了有关物理（O穿过船体的扩散）和生理（ABA和GA敏感性）因素如何调节休眠和萌发的见解。

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