Differentiation of germination characteristics in Scutellaria rubropunctata (Lamiaceae) associated with adaptation to rheophytic habitats in the subtropical Ryukyu Islands of Japan
| Autor: | Tetsuo Denda, Hikaru Yoshimura, Mikoto Hamagawa, Shogo Arakaki, Masatsugu Yokota, Yoshio Kitamura |
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| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
0301 basic medicine Facultative Rheophyte Perennial plant Scutellaria food and beverages Plant physiology Germination Plant Science Subtropics Biology Environment Plant Dormancy 01 natural sciences Adaptation Physiological Plant ecology 03 medical and health sciences Horticulture 030104 developmental biology Japan Rivers Dormancy 010606 plant biology & botany |
| Zdroj: | Journal of plant research. 132(3) |
| ISSN: | 1618-0860 |
| Popis: | Seed germination characteristics of a facultative rheophyte Scutellaria rubropunctata, a perennial skullcap endemic to the subtropical Ryukyu Islands of Japan, were investigated at temperatures of 15 °C, 20 °C, 25 °C, and 30 °C. The rheophytic type of S. rubropunctata showed relatively simultaneous germination times and reached high germination rates under all temperatures tested. This characteristic may allow it to establish quickly without being influenced by temperature, giving a survival advantage in rheophytic habitats by avoiding seeds being washed away by the rising water. In contrast, the final germination rate of the terrestrial type of S. rubropunctata, as well as that of the congener S. indica var. parvifolia, was highest at 15 °C and declined drastically at 30 °C. Seeds of both of these plants that remained ungerminated at higher temperatures germinated soon after the temperature was changed to 15 °C, indicating that the germination suppression was a state of enforced dormancy that was released after transfer to the optimal temperature. These characteristics suggest an asynchronous germination which is thought to reduce the risk of disturbance in fluctuating environments. Our study may be the first to demonstrate the differentiation of seed germination characteristics in relation to adaptations to a rheophytic habitat. Because rheophytes occupy such a harsh environment under strong selective pressure, the adaptive differentiation of seed germination characteristics may occur in many other rheophytes. |
| Databáze: | OpenAIRE |
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