Positive and negative signals regulate germination in the post- fire annual, Nicotiana attenuata
Positive and negative signals regulate germination in the post- fire annual, Nicotiana attenuata
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正信号和负信号调节火后一年生烟草的发芽
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
I. Baldwin
中科院分区：
文献类型：
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作者：
C. Preston;I. Baldwin
众所周知，许多植物的凋落物会抑制发芽，这种现象通常被解释为一种植物对另一种植物的化感抑制。然而，另一种解释是，种子可能利用环境信号来告知它们发芽的时间，从而将休眠作为一种选择栖息地的机制。烟叶。寺庙。（茄科）通常在火灾后不到三年就能在北美大盆地沙漠的山艾树、黑树和矮松柏林中找到。在这短暂的火灾后时期，休眠种子库被建立，α-纤维素（仅含C、H和O）在木材烟雾中的热解产物被认为可以启动该物种休眠种子的萌发。我们在一项温室实验中证明，在烧焦的土壤中发芽（与未烧焦的土壤相比），其终生种子产量增加了12倍，这反映了对准确种植的适应性效益的最小估计。
The litter of many plant species is known to inhibit germination, and this phenomenon is commonly interpreted as allelopathic inhibition of one species by another. However, an alternative interpretation is that seeds may be using environmental signals to inform the timing of their germination and thereby use dormancy as a mechanism of habitat choice. Nicotiana attenuata Torr. ex Wats. (Solanaceae) is typically found for less than three years after fire in the sagebrush, blackbrush, and pinyon–juniper forests of the Great Basin desert of North America. A dormant seed bank is established during this ephemeral post-fire period, and pyrolysis products of α-cellulose (containing only C, H, and O) in wood smoke are known to initiate germination in dormant seeds of this species. We demonstrated in a glasshouse experiment that germination into burned soils (as compared to unburned) results in a 12-fold increase in lifetime seed production, which reflects a minimum estimate of the fitness benefit of making accurat...