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TEMPERATURE EFFECTS ON THE SEED GERMINATION OF SOME PERENNIAL AND ANNUAL SPECIES OF ASTERACEAE FAMILY

机译:温度对菊苣科一些多年生和种子的种子萌发的影响

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Temperature is the most critical factor determining success or failure of plant establishment. Seed germination response of five medicinal species include three seed-propagated perennial species, Cichorium intybus, cynara scofymus and Echinacea purpurea and vegetative-reproduction perennial species, Achillea millefolium and annual species, Matricaria aurea were assessed at constant temperatures. The seeds were exposed to constant temperatures of 5, 10, 15, 20, 25, 30, 35, 40 and 45°C under total darkness. Germination percentage of all the species were significantly affected by various temperatures (p < 0.001). A. millefolium did not germinate at 5-10 and 35-45°C, but showed noticeable germination percentage (73.3-100%) at temperatures ranged from15-30° C. The highest total germination percentage was observed within the range of 15-35 °C for other species. Also, we calculated cardinal temperatures (the minimum, optimum and maximum temperature) for seed germination of species. The highest valuefor minimum temperature was 10.07°C in A. millefolium followed by C. scofymus and M. aurea (5°C) while the lowest was for E. purpurea and C. intybus (2.68 and 2.90°C respectively). The lowest value for optimum temperature was detected in A. millefolium (22.72°C) and M. aurea (23.88°C) while the maximum values were observed in E. purpurea and C. intybus (30.40°C and 29.90°C respectively). Based on results of present study we concluded that species with both vegetative and seed-propagated reproduction forms like A. millefolium had smaller temperature range rather those with just one way of reproduction (seed production).
机译:温度是决定工厂建立成败的最关键因素。五个药用物种的种子萌发响应包括三个种子繁殖的多年生物种,菊苣菊(Cichorium intybus),辛纳麦角丝虫(Cynara scofymus)和紫锥菊(Echinacea purpurea)以及无性繁殖多年生物种Achillea millefolium和一年生物种,在恒定温度下评估了Matricaria aurea。将种子在完全黑暗的条件下暴露于5、10、15、20、25、30、35、40和45°C的恒定温度下。不同温度下所有物种的发芽率均受到显着影响(p <0.001)。千叶草在5-10和35-45°C时不会发芽,但在15-30°C的温度下显示出明显的发芽率(73.3-100%)。在15-30°C的范围内观察到最高的总发芽率其他物种为35°C。另外,我们计算了物种种子萌发的基本温度(最低,最佳和最高温度)。最低温度的最高值在小叶曲霉中为10.07°C,其后是角膜梭菌和金黄色葡萄球菌(5°C),而最低值是紫癜和不动杆菌(分别为2.68和2.90°C)。在米曲霉(22.72°C)和金黄色葡萄球菌(23.88°C)中检测到最佳温度的最低值,而在紫丁香和不育梭状芽胞杆菌(分别为30.40°C和29.90°C)中观察到了最大值。 。根据目前的研究结果,我们得出结论,具有营养繁殖和种子繁殖繁殖形式(如米曲霉)的物种具有较小的温度范围,而只有一种繁殖方式(种子生产)。

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