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Datura roots were pressure-infiltrated with 400 µg ml115N-nitrate feeding solutions with and without the additionof 7 mM L-methionine-DL-sulphoximine (MSO), a glutamine synthetaseinhibitor. Over a 30 min time course the main diversion of newlyreduced 15N in MSO untreated roots was to glutamine. In MSO-treatedroots ammonia assimilation into amino compounds was completelysuppressed, with resultant accumulation of a large 15N ammoniapool. This treatment also caused marked concentrational changesin the free amino compound pools, suggesting that conditionsof nitrogen stress had been induced. Glutamate dehydrogenaseactivity was unaffected by the MSO treatment. The results are consistent with the concept that the glutaminesynthetase/glutamate synthase pathway is the major route ofnewly reduced nitrogen assimilation in Datura roots. 相似文献
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