Effect of Seed Position on Parental Plant on Proportion of Seeds Produced with Nondeep and Intermediate Physiological Dormancy.
Effect of Seed Position on Parental Plant on Proportion of Seeds Produced with Nondeep and Intermediate Physiological Dormancy.
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亲本种子位置对非深、中度生理休眠种子比例的影响
DOI：
10.3389/fpls.2017.00147
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发表时间：
2017
影响因子：
5.6
通讯作者：
Baskin JM
中科院分区：
文献类型：
--
作者：
Lu JJ;Tan DY;Baskin CC;Baskin JM
种子在亲本植株上的发育位置会对休眠的打破和萌发产生影响。我们验证了紫花青属植物总状花序近端产生的中等生理休眠(PD)种子的比例高于远端产生的种子比例的假说，并进一步认为这种差异与种子发育过程中的温度有关。每隔3天给植株浇水，并分别从同一植株上的总状花序的近(早)和远(晚)位置收集硅片和种子，并检测其萌发情况。硅片和种子在室温(后熟)下干燥贮藏0个月和6个月后，进行0-16周的冷层积，并进行萌发试验。两组种子发育/成熟期间的日平均最高和最低温度没有差异。总状花序近端硅片比远端硅胶产生的种子中具有中间水平的种子比例高于非深层水平的种子，而具有非深水平PD的种子比例在总状花序的远端高于近端。这些差异不仅仅是由于种子质量的原因。由于总状花序中种子发育过程中的温度和土壤水分条件是相同的，因此具有中间和非深层PD的种子所占比例的差异应归因于亲本植株上的位置。这种现象的生态后果是，它确保了种子群内打破休眠和萌发特征的多样性，这可能是一种更好的对冲策略。这是第一次证明位置对后代帕金森病水平的影响。
The position in which seeds develop on the parental plant can have an effect on dormancy-break and germination. We tested the hypothesis that the proportion of seeds with intermediate physiological dormancy (PD) produced in the proximal position on a raceme of Isatis violascens plants is higher than that produced in the distal position, and further that this difference is related to temperature during seed development. Plants were watered at 3-day intervals, and silicles and seeds from the proximal (early) and distal (late) positions of racemes on the same plants were collected separately and tested for germination. After 0 and 6 months dry storage at room temperature (afterripening), silicles and seeds were cold stratified for 0–16 weeks and tested for germination. Mean daily maximum and minimum temperatures during development/maturation of the two groups of seeds did not differ. A higher proportion of seeds with the intermediate level than with the nondeep level of PD was produced by silicles in the proximal position than by those in the distal position, while the proportion of seeds with nondeep PD was higher in the distal than in the proximal position of the raceme. The differences were not due only to seed mass. Since temperature and soil moisture conditions were the same during development of the seeds in the raceme, differences in proportion of seeds with intermediate and nondeep PD are attributed to position on parental plant. The ecological consequence of this phenomenon is that it ensures diversity in dormancy-breaking and germination characteristics within a seed cohort, a probable bet-hedging strategy. This is the first demonstration of position effects on level of PD in the offspring.