Abstract:
KEY MESSAGE:Degradation of nitrogen-rich purines is tightly and oppositely regulated under drought and low nitrogen supply in bread wheat. Allantoin is a key target metabolite for improving nitrogen homeostasis under stress. The metabolite allantoin is an intermediate of the catabolism of purines (components of nucleotides) and is known for its housekeeping role in nitrogen (N) recycling and also for its function in N transport and storage in nodulated legumes. Allantoin was also shown to differentially accumulate upon abiotic stress in a range of plant species but little is known about its role in cereals. To address this, purine catabolic pathway genes were identified in hexaploid bread wheat and their chromosomal location was experimentally validated. A comparative study of two Australian bread wheat genotypes revealed a highly significant increase of allantoin (up to 29-fold) under drought. In contrast, allantoin significantly decreased (up to 22-fold) in response to N deficiency. The observed changes were accompanied by transcriptional adjustment of key purine catabolic genes, suggesting that the recycling of purine-derived N is tightly regulated under stress. We propose opposite fates of allantoin in plants under stress: the accumulation of allantoin under drought circumvents its degradation to ammonium (NH4+) thereby preventing N losses. On the other hand, under N deficiency, increasing the NH4+ liberated via allantoin catabolism contributes towards the maintenance of N homeostasis.
journal_name
Plant Mol Bioljournal_title
Plant molecular biologyauthors
Casartelli A,Melino VJ,Baumann U,Riboni M,Suchecki R,Jayasinghe NS,Mendis H,Watanabe M,Erban A,Zuther E,Hoefgen R,Roessner U,Okamoto M,Heuer Sdoi
10.1007/s11103-019-00831-zsubject
Has Abstractpub_date
2019-03-01 00:00:00pages
477-497issue
4-5eissn
0167-4412issn
1573-5028pii
10.1007/s11103-019-00831-zjournal_volume
99pub_type
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