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ORIGINAL RESEARCH article

Front. Plant Sci.
Sec. Plant Physiology
Volume 15 - 2024 | doi: 10.3389/fpls.2024.1452072
This article is part of the Research Topic Phytohormones as Crucial Players in Organ Abscission View all 3 articles

Phytohormonal Dynamics in the Abscission Zone of Korla Fragrant Pear during Calyx Abscission：A Visual Study

Provisionally accepted
Ling l. Zheng Ling l. Zheng 1Yue Wen Yue Wen 1*Yan Lin Yan Lin 1*Jia Tian Jia Tian 1Jie J. Shaobai Jie J. Shaobai 1*Chao Z. Hao Chao Z. Hao 1*Chun F. Wang Chun F. Wang 1,2*Yu T. Sun Yu T. Sun 1*Lei Wang Lei Wang 1*Chen Chen Chen Chen 1*
  • 1 Xinjiang Agricultural University, Ürümqi, China
  • 2 Xinjiang Korla fragrant pear research center, Korla, China

The final, formatted version of the article will be published soon.

    The results revealed that the mitochondria in the abscission zone of the decalyx fruits were regularly distributed around the cell wall, and the chloroplasts were moderately present. In contrast, in the persistent calyx fruit, the corresponding parts of the abscission zone showed a scattered distribution of mitochondria within the cells, and there was a higher number of chloroplasts, which also contained starch granules inside. Mass spectrometry imaging revealed that ABA was enriched in the abscission zone of the decalyx fruit, and their ionic signal intensities were significantly stronger than those of the persistent calyx fruit. However, the ionic signal intensities of Indole-3-acetic acid (IAA) and Gibberellin A3 (GA3) of the persistent calyx fruit were significantly stronger than those in the abscission zone of the decalyx fruit and were concentrated in the persistent calyx fruit, 1-Aminocyclopropanecarboxylic Acid (ACC) did not show distinct regional distribution in both decalyx and persistent calyx fruits. Furthermore, before the formation of the abscission zone, the levels of IAA, GA3, and zeatin (ZT) in the abscission zone of decalyx fruits were significantly lower than those in the persistent calyx fruits by 37.9%, 57.7%, and 33.0%, respectively, while the levels of abscisic acid (ABA) and ethylene (ETH) were significantly higher by 21.9% and 25.0%.During the formation of the abscission zone, the levels of IAA, GA3, and ZT in the abscission zone of decalyx fruits were significantly lower than those in the persistent calyx fruits by 41.7%, 71.7%, and 24.6%, respectively, while the levels of ABA and ETH were significantly higher by 15.2% and 80.0%. After the formation of the abscission zone, the levels of IAA and GA3 in the abscission zone of decalyx fruits were lower than those in the persistent calyx fruits by 20.8% and 47.8%, respectively, while the levels of ABA and ETH were higher by 271.8% and 26.9%, respectively. In summary, during the calyx abscission process of Korla fragrant pears, IAA and GA3 in the abscission zone inhibited abscission, while ABA and ETH promoted calyx abscission.

    Keywords: Korla fragrant pear, Calyx abscission, abscission zone, microstructure, phytohormone, spatial distribution, MALDI-MSI technique

    Received: 20 Jun 2024; Accepted: 05 Sep 2024.

    Copyright: © 2024 Zheng, Wen, Lin, Tian, Shaobai, Hao, Wang, Sun, Wang and Chen. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

    * Correspondence:
    Yue Wen, Xinjiang Agricultural University, Ürümqi, China
    Yan Lin, Xinjiang Agricultural University, Ürümqi, China
    Jie J. Shaobai, Xinjiang Agricultural University, Ürümqi, China
    Chao Z. Hao, Xinjiang Agricultural University, Ürümqi, China
    Chun F. Wang, Xinjiang Agricultural University, Ürümqi, China
    Yu T. Sun, Xinjiang Agricultural University, Ürümqi, China
    Lei Wang, Xinjiang Agricultural University, Ürümqi, China
    Chen Chen, Xinjiang Agricultural University, Ürümqi, China

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