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Impacts of fire cues on germination of Brassica napus L. seeds with high and low secondary dormancy.
Plant Biology ( IF 4.2 ) Pub Date : 2020-03-25 , DOI: 10.1111/plb.13115 A Shayanfar 1 , F Ghaderi-Far 1 , R Behmaram 2 , A Soltani 1 , H R Sadeghipour 3
中文翻译：
火种提示对高和低二级休眠甘蓝型油菜种子萌发的影响。
更新日期：2020-03-25
Plant Biology ( IF 4.2 ) Pub Date : 2020-03-25 , DOI: 10.1111/plb.13115 A Shayanfar 1 , F Ghaderi-Far 1 , R Behmaram 2 , A Soltani 1 , H R Sadeghipour 3
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- Agricultural burning is used in farm management operations; however, information about the impact of fire cues on the release and/or induction of secondary dormancy in crop seeds is scarce.
- Seeds from two oilseed rape cultivars were induced for high (HD) or low (LD) secondary dormancy using polyethyleneglycol (PEG) pre‐treatment, and their germination after exposure to various fire cues was compared to control PEG pre‐treated and non‐dormant seeds.
- Non‐dormant seed germination was unaffected by various fire cues. Low doses of aerosol smoke released secondary dormancy in HD seeds, while higher doses increased dormancy of LD seeds. Dilute smoke water also released HD seed secondary dormancy, but concentrated smke water enhanced dormancy in both LD and HD seeds. The concentrated aqueous extracts from charred oilseed rape straw only promoted germination of HD seeds, while dilution inhibited LD seed germination. Heat shock (80 °C, 5 min) released secondary dormancy in HD seeds; however, higher temperatures and/or increased exposure time was associated with seed death. GC‐MS analyses of smoke water revealed two butenolides and an array of monoaromatic hydroxybenzene compounds with potential germination inhibitor or promoter activity.
- The extent of secondary dormancy induction in seeds affects their subsequent responses to fire cues. Both aerosol smoke and smoke water have both germination promoter and inhibitor activity. Lacking any butenolides, aqueous extracts of charred straw contain a potential germination stimulating steroid, i.e. ergosterol. The significance of fire‐derived cues on behaviour of oilseed rape seeds in the soil seed bank is discussed.
中文翻译：
火种提示对高和低二级休眠甘蓝型油菜种子萌发的影响。
- 农业燃烧用于农场管理活动；然而，关于火种对作物种子释放和/或诱导次级休眠的影响的信息很少。
- 使用聚乙二醇（PEG）预处理诱导两个高油菜品种的种子处于高（HD）或低（LD）次生休眠状态，并将其在暴露于各种火势后的发芽与对照PEG预处理和非休眠进行比较种子。
- 非休眠种子发芽不受各种火势的影响。低剂量的气雾剂烟雾可释放高清种子的次级休眠，而高剂量的烟雾可增加LD种子的休眠。稀烟水还释放了HD种子的第二休眠状态，但是浓烟水增强了LD和HD种子的休眠状态。从焦油菜籽秸秆中提取的浓缩水提取物仅能促进HD种子的发芽，而稀释则可以抑制LD种子的发芽。热激（80°C，5分钟）释放了HD种子的次级休眠；然而，较高的温度和/或增加的暴露时间与种子死亡有关。烟气的GC-MS分析表明，有两个丁烯内酯和一系列具有潜在发芽抑制剂或促进剂活性的单芳族羟基苯化合物。
- 种子中次生休眠诱导的程度会影响种子对火种的后续反应。气溶胶烟雾和烟雾水均具有发芽促进剂和抑制剂活性。缺少任何丁烯内酯，烧焦的稻草的水提物含有刺激发芽的类固醇，即麦角固醇。讨论了火源线索对油料种子在土壤种子库中行为的重要性。
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