BRIEF RESEARCH REPORT article
Front. Plant Sci.
Sec. Plant Physiology
Volume 16 - 2025 | doi: 10.3389/fpls.2025.1570821
Petal Stomata of Hemerocallis citrina Baroni are Sensitive to Abscisic Acid
Provisionally accepted
- 1Longdong University, Qingyang, China
- 2University of Tabuk, Tabuk, Tabuk, Saudi Arabia
- 3Lanzhou University, Lanzhou, China
Select one of your emails
You have multiple emails registered with Frontiers:
Notify me on publication
Please enter your email address:
If you already have an account, please login
You don't have a Frontiers account ? You can register here
In response to drought stress, abscisic acid (ABA) plays a crucial role in regulating stomatal closure in both leaf and floral tissues. Studies on stomatal regulation have primarily focused on the leaves of vascular plants, but stomatal regulation of flowers remains underexplored. The current study was conducted on the petals of 'Ma Lin' daylily (Hemerocallis citrina Baroni) to assess the morphological characteristics of petal stomata, stomatal aperture, gas exchange, and the mechanisms of ABA signaling in response to treatments with ABA-related chemicals and their corresponding scavengers. The study showed that stomata are primarily located in the lower epidermis of the petals, arranged in a strip near the central vein, and exhibit relatively low density; the guard cells contain a large number of chloroplasts. Exogenous ABA induced stomatal closure in the petal stomata, and the gas exchange assay indicated that stomatal conductance decreased when exogenous ABA was introduced into the transpiration stream. The stomatal aperture assay revealed a 32.78% decrease following a 10 µM ABA treatment. Furthermore, both hydrogen peroxide (H₂O₂) and nitric oxide (NO) were involved in the ABA-induced stomatal closure process, with H₂O₂ acting as an upstream component of NO. Overall, these results suggest that physiologically active stomatal control is present in the flower of 'Ma Lin' daylily under drought stress, consistent with the regulation observed in leaf stomata.
Keywords: petal stomata, floral gas exchange, Stomatal aperture, ABA signaling, drought stress adaptation
Received: 04 Feb 2025; Accepted: 29 May 2025.
Copyright: © 2025 Gong, Hua, Su, Zhang, Yao, Alharbi and Hasan. 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:
Lei Gong, Longdong University, Qingyang, China
Md. Mahadi Hasan, Lanzhou University, Lanzhou, China
Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.