Accumulation of Nitrogen Supplied as Ammonium in the Root Tips of Aluminum-Stressed Wheat Cultivars Differing in Aluminum Sensitivity

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Ammonium labeled with ^<15>N was supplied for two days to two wheat (Trilicum aestivum L.) cultivars treated with Al. At a low Al concentration, root elongation was greatly inhibited by treatment for 24 hours in cultivar Chikushikomugi, while in cuitivar Shirosanjyaku, significant inhibition of root elongation required treatment for 48 hours. Decreases in pH values of nutrient solution were greater in Shirosanjyaku than Chikushikomugi and smaller at a higher Al concentration in both the varieties. These results indicate that uptake of ammonium was more strongly inhibited by Al in Chikushikomugi than Shirosanjyaku. Accumulation of newly absorbed nitrogen (^<15>N) was decreased at a low Al concentration in the apical part of root tip (0- 12mm) of Chikushikomugi. In Shirosanjyaku treated with a low concentration of Al, accumulation of ^<15>N increased rather than inhibited. At a high Al concentration, accumulation of ^<15>N slightly decreased in the root tip of Shirosanjyaku. Accumulation of ^<15>N in four segments dissected from a root tip was differently affected between Shirosanjyaku and Chikushikomugi. It is considered that Shirosanjyaku is able to maintain active nitrogen metabolism in the root tip under Al-stress conditions compared to Chikushikomugi.
九州大学の論文