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首页> 外文期刊>Plant Growth Regulation >Hormonal and environmental regulation of seed germination in flixweed (Descurainia sophia)
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Hormonal and environmental regulation of seed germination in flixweed (Descurainia sophia)

机译：桔梗种子发芽的激素和环境调控

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摘要

Flixweed is one of the most abundant weeds in North America and China, and causes a reduction in crop yields. Dormancy of flixweed seeds is deep at maturity and is maintained in soil for several months. To identify regulators of seed dormancy and germination of flixweed, the effect of environmental and hormonal signals were examined using dormant and non-dormant seeds. The level of dormancy was decreased during after-ripening and stratification, but long imbibition (over 5 days) at 4 °C in the dark resulted in the introduction of secondary dormancy. The strict requirement of duration of cold treatment for the break of dormancy may play a role in the seasonal regulation of germination. The germination of non-dormant flixweed seeds was critically regulated by red (R) and far-red (FR) light in a photoreversible manner. Sodium nitroprusside, a donor of nitric oxide (NO), promoted germination of half-dormant seeds, suggesting that NO reduced the level of seed dormancy. As has been shown in other related species, light elevated sensitivity to GA4 in dark-imbibied flixweed seeds, but cold treatment did not affect GA4-sensitivity unlike in Arabidopsis. Taken together, our results indicate that seed germination in flixweed and its close relative Arabidopsis is controlled by similar as well as distinct mechanisms in response to various endogenous and environmental signals.
机译：lix草是北美和中国最丰富的杂草之一，导致农作物减产。杂草种子的休眠在成熟时很深，并在土壤中维持了几个月。为了确定亚麻休眠和萌发的调节剂，使用休眠和非休眠种子检查了环境和激素信号的影响。熟化和分层后休眠水平降低，但在黑暗中4°C下长时间吸水（超过5天）导致引入次级休眠。严格的冷藏时间要求以打破休眠状态可能在发芽的季节性调节中起作用。红（R）和远红（FR）光以光可逆的方式严格调节非休眠的长春种子的萌发。一氧化氮（NO）的供体硝普钠促进半休眠种子的萌发，表明NO降低了种子休眠的水平。正如其他相关物种所表明的那样，光对暗吸长草种子的GA4 敏感性增强，但是与拟南芥不同，冷处理对GA4 敏感性没有影响。综上所述，我们的结果表明，长春及其近缘拟南芥的种子萌发受响应于各种内源性和环境信号的类似机制以及不同机制的控制。

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