Polyamines mediate the inhibitory effect of drought stress on nitrogen reallocation and utilization to regulate grain number in wheat

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dc.creatorLi, Juan
dc.creatorLi, Qi
dc.creatorNian, GUO
dc.creatorXian, Qinglin
dc.creatorLan, Bing
dc.creatorNangia, Vinay
dc.creatorMo, Fei
dc.creatorLiu, Yang
dc.date2024-02-02
dc.date2024-11-21T21:53:02Z
dc.date2024-11-21T21:53:02Z
dc.date.accessioned2026-06-27T14:24:27Z
dc.descriptionDrought stress poses a serious threat to grain formation in wheat. Nitrogen (N) plays crucial roles in plant organ development; however, the physiological mechanisms by which drought stress affects plant N availability and mediates the formation of grains in spikes of winter wheat are still unclear. In this study, we determined that pre-reproductive drought stress significantly reduced the number of fertile florets and the number of grains formed. Transcriptome analysis demonstrated that this was related to N metabolism, and in particular, the metabolism pathways of arginine (the main precursor for synthesis of polyamine) and proline. Continuous drought stress restricted plant N accumulation and reallocation rates, and plants preferentially allocated more N to spike development. As the activities of amino acid biosynthesis enzymes and catabolic enzymes were inhibited, more free amino acids accumulated in young spikes. The expression of polyamine synthase genes was down-regulated under drought stress, whilst expression of genes encoding catabolic enzymes was enhanced, resulting in reductions in endogenous spermidine and putrescine. Treatment with exogenous spermidine optimized N allocation in young spikes and leaves, which greatly alleviated the drought-induced reduction in the number of grains per spike. Overall, our results show that pre-reproductive drought stress affects wheat grain numbers by regulating N redistribution and polyamine metabolism.
dc.identifierhttps://hdl.handle.net/10568/162578
dc.identifier.urihttp://hdl.handle.net/123456789/78795
dc.languageen
dc.publisherOxford University Press (OUP): Policy F - Oxford Open Option D
dc.rightsLimited Access
dc.sourceJuan Li, Qi Li, GUO Nian, Qinglin Xian, Bing Lan, Vinay Nangia, Fei Mo, Yang Liu. (2/2/2024). Polyamines mediate the inhibitory effect of drought stress on nitrogen reallocation and utilization to regulate grain number in wheat. Journal of Experimental Botany, 75 (3), pp. 1016-1035.
dc.subjectwheat
dc.subjectnitrogen use efficiency
dc.subjectdrought stress
dc.subjecttriticum aestivum
dc.subjectspermidine
dc.subjectwheat
dc.subjectwater deficit
dc.subjectrna-seq
dc.subjectgrain yield
dc.subjectamino acid
dc.subjectfertile floret
dc.subjectnitrogen allocation
dc.titlePolyamines mediate the inhibitory effect of drought stress on nitrogen reallocation and utilization to regulate grain number in wheat
dc.typeJournal Article

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Centro Internacional para la Investigación Agrícola en las Áreas Secas (ICARDA)