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<p>Nitrogen (N) is essential for preserving green leaf area in wheat during the late growth phases and for postponing senescence. This research examined foliar N uptake, translocation, and redistribution in stay-green (YM66) and early-senescent (WM6) wheat plants treated with <sup>15</sup>N-labeled urea applied to flag leaves before and after anthesis. The redistribution of absorbed <sup>15</sup>N was observed during the grain-filling phase. Post-anthesis, YM66 exhibited a larger green leaf area and higher chlorophyll content compared to WM6 and demonstrated superior foliar <sup>15</sup>N uptake at both administration periods. At maturity, 51–56% of the absorbed <sup>15</sup>N before anthesis was detected in the grain, but 19–30% and 18–25% were retained in the leaves and stems, respectively. After post-anthesis treatment, 40–48.7% of absorbed <sup>15</sup>N was remobilized to the grain, whereas the majority remained in vegetative tissues. The data indicate that grain N in both genotypes primarily originates from N assimilated before anthesis, and that the stay-green genotype shows improved foliar N uptake and redistribution during grain filling. The results offer a physiological insight into N dynamics linked to differing senescence behaviors in wheat.</p>

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Foliar 15N-urea absorption and translocation in wheat with contrasting senescence patterns at late growth stage

  • 期刊论文

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  • 发表日期：

    2026年2月17日

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  • Yue-Hua Gong,
  • Yu-Min Zhu,
  • Tao Li,
  • Mohamed F. Abo El-Maati,
  • Wan-Hai Zhou,
  • Ahmed H. El-Sappah

摘要

Nitrogen (N) is essential for preserving green leaf area in wheat during the late growth phases and for postponing senescence. This research examined foliar N uptake, translocation, and redistribution in stay-green (YM66) and early-senescent (WM6) wheat plants treated with 15N-labeled urea applied to flag leaves before and after anthesis. The redistribution of absorbed 15N was observed during the grain-filling phase. Post-anthesis, YM66 exhibited a larger green leaf area and higher chlorophyll content compared to WM6 and demonstrated superior foliar 15N uptake at both administration periods. At maturity, 51–56% of the absorbed 15N before anthesis was detected in the grain, but 19–30% and 18–25% were retained in the leaves and stems, respectively. After post-anthesis treatment, 40–48.7% of absorbed 15N was remobilized to the grain, whereas the majority remained in vegetative tissues. The data indicate that grain N in both genotypes primarily originates from N assimilated before anthesis, and that the stay-green genotype shows improved foliar N uptake and redistribution during grain filling. The results offer a physiological insight into N dynamics linked to differing senescence behaviors in wheat.