ArticleBMC plant biology2025
Moderate nitrogen supply alleviates low temperature stress by regulating nitrogen assimilation and hormone signaling in wheat tillering nodes.
Article in BMC plant biology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundClimate change has brought many low–temperature events, which occurred more frequently in most wheat production regions of China. Low temperature stress inhibits early growth and development in wheat, causing severe damage or yield losses. Nitrogen (N) application enhances wheat growth and yield, yet few studies focus on how nitrogen regulates nitrogen assimilation and hormone signaling in wheat tillering nodes to alleviate low temperature stress. Therefore, in a 14–year long–term field experiment, we investigated physiological responses and transcriptome profiles of winter wheat under low-temperature stress and four N levels (N0–N3: 0, 90, 180, and 270 kg ha-1, respectively).
resultsN application rate significantly enhanced dry weight, tiller number, N accumulation, and yield as compared with the treatment without nitrogen (N0) under low-temperature stress. Moderate nitrogen supply (N2) most effectively increased these parameters by 70.3%, 50.0%, 92.9%, and 20.1%, respectively, compared with N0. The proline (Pro) and amino acids (AAs) content, catalase (CAT) and peroxidase (POD) activities increased with increasing N level, with N2 exhibiting the best performance. N application rate also increased auxin (IAA), trans–zeatin (tZ), and abscisic acid (ABA) contents, and N2 exhibited the highest IAA and ABA contents with increase by 39.2% and 12.2%, respectively, compared with N0. Transcriptome analysis indicated that some key genes such as those encoding nitrate reductase (NR), ferredoxin-nitrite reductase (NiR), cytokinin dehydrogenase and phenylalanine ammonia lyase were involved in the interaction between N supply and low temperature stress.
conclusionThese findings indicate that moderate N at 180 kg ha-1 significantly enhances low temperature stress tolerance in winter wheat by increasing the antioxidant capacity and hormone content of tillers, and promoting nitrogen metabolism to increase the yield.
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