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<p>Phytohormones are known to have important regulatory roles in floral bud dormancy. Comparative metabolomics (LC-MS/MS) was used to examine the profiles of phytohormones during peach floral bud dormancy and demonstrated significant differences between the low and high chilling requirement (CR) peach varieties, ‘Changlvmaotao1’ and ‘Jinxiu’, respectively. Of the 88 phytohormones tested, 70 were detected in floral buds, but 44 were present in levels above threshold detection limits. Most hormones levels were relatively low or static during endodormancy, with only six showing significant changes, including jasmonic acid (JA) and its derivatives, jasmonoyl-L-isoleucine (JA-ILE) and N-[(-)-Jasmonoyl]-(L)-valine (JA-Val), 1-Aminocyclopropanecarboxylic acid, abscisic acid, 1-amino-cyclopropane-1-carboxylic acid and the gibberellin, GA53. However, 28 significant changes were observed in ecodormancy, including auxins, cytokinins and salicylic acid. The levels of JA and its derivatives, JA-ILE and JA-Val, all showed differential levels throughout dormancy, suggesting their important and diverse roles in the regulation of dormancy. The varieties of differing CR showed substantially differing phytohormone profiles during endo- and eco-dormancy, including 6-Benzyladenosine, L-tryptophan, 3-oxo-2-(2-(Z)-Pentenyl) cyclopentane-1-hexanoic acid, cis(+)-12-Oxophytodienoic acid, 3-oxo-2-(2-(Z)-Pentenyl) cyclopentane-1-butyric acid, and gibberellin GA1. Our preliminary findings indicate hormones and related metabolites which are likely to have regulatory roles in the maintenance or progression of bud dormancy in peach varieties of differing CR and which are therefore promising targets for further study and as physiological markers in peach breeding efforts.</p>

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The profiling of phytohormone levels with developmental progression in dormant floral buds in peach varieties of differing chilling requirements

  • 期刊论文

  • 发表日期：

    2025年7月30日

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  • Juan Yan,
  • Jiyao Li,
  • Meng Sun,
  • Zhixiang Cai,
  • Binbin Zhang,
  • Jianlan Xu,
  • Ruijuan Ma,
  • Mingliang Yu,
  • Zhijun Shen

摘要

Phytohormones are known to have important regulatory roles in floral bud dormancy. Comparative metabolomics (LC-MS/MS) was used to examine the profiles of phytohormones during peach floral bud dormancy and demonstrated significant differences between the low and high chilling requirement (CR) peach varieties, ‘Changlvmaotao1’ and ‘Jinxiu’, respectively. Of the 88 phytohormones tested, 70 were detected in floral buds, but 44 were present in levels above threshold detection limits. Most hormones levels were relatively low or static during endodormancy, with only six showing significant changes, including jasmonic acid (JA) and its derivatives, jasmonoyl-L-isoleucine (JA-ILE) and N-[(-)-Jasmonoyl]-(L)-valine (JA-Val), 1-Aminocyclopropanecarboxylic acid, abscisic acid, 1-amino-cyclopropane-1-carboxylic acid and the gibberellin, GA53. However, 28 significant changes were observed in ecodormancy, including auxins, cytokinins and salicylic acid. The levels of JA and its derivatives, JA-ILE and JA-Val, all showed differential levels throughout dormancy, suggesting their important and diverse roles in the regulation of dormancy. The varieties of differing CR showed substantially differing phytohormone profiles during endo- and eco-dormancy, including 6-Benzyladenosine, L-tryptophan, 3-oxo-2-(2-(Z)-Pentenyl) cyclopentane-1-hexanoic acid, cis(+)-12-Oxophytodienoic acid, 3-oxo-2-(2-(Z)-Pentenyl) cyclopentane-1-butyric acid, and gibberellin GA1. Our preliminary findings indicate hormones and related metabolites which are likely to have regulatory roles in the maintenance or progression of bud dormancy in peach varieties of differing CR and which are therefore promising targets for further study and as physiological markers in peach breeding efforts.