5. 重力屈性と水分屈性の相互作用を担う生体内因子の探索

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Root systems are responsible for acquisition of all the water and nutrients from the soil. Therefore, it is important for plants to develop root systems for avoiding stressful environments and establishing their stand. Thus, roots have been shown to recognize many environmental signals that regulate root system architecture; namely, gravity, light, touch, and moisture gradients. Hydrotropism is the response of roots to a moisture gradient and thought to play an impotant role in avoiding water stress. However, only gravitropic response has been extensively studied among these responses, for gravitropism generally dominates other tropisms. In fact, gravitropic interference with hydrotropism has been shown in several plant species. At the same time, hydrotropism and gravitropism have been proved to share common features. But, how different stimuli lead to a common response remains unclear. To gain new insights on the problem, we searched the molecules that affect either or both gravitropism and hydrotropism. We treated Arabidopsis seedlings with various inhibitors and examined their effects on gravitropism and hydrotropism in roots. The results showed that inhibitors of polar auxin transport inhibited only gravitropism but not hydrotropism, while Ca^<2+> chelator was inhibitory to both tropisms. These results suggest that Ca^<2+> is essential for both gravitropism and hydrotropism, whereas polar auxin transport is necessary only for gravitropic response.
2005-10-13

5. 重力屈性と水分屈性の相互作用を担う生体内因子の探索

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