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Abscisic acid mediates the reduction of petunia flower size at elevated temperatures due to reduced cell division
Year:
2022
Source of publication :
Planta
Authors :
Duchin, Shai
;
.
Shaya, Felix
;
.
Spitzer-Rimon, Ben
;
.
Weissberg, Mira
;
.
Volume :
255
Co-Authors:
  • Archit Sood, 
  • Shai Duchin, 
  • Zahar Adamov, 
  • Mira Carmeli-Weissberg, 
  • Felix Shaya  
  • Ben Spitzer-Rimon 
Facilitators :
From page:
0
To page:
0
(
Total pages:
1
)
Abstract:

Flower size is one of the most important showy traits in determining pollinator attraction, and a central factor determining the quality of floricultural products. Whereas the adverse effects of elevated temperatures on showy traits have been described in detail, its underlining mechanisms is poorly understood. Here, we investigated the physiological mechanism responsible for the reduction of flower size in petunia under elevated temperatures. We found that the early stages of flower-bud development were most sensitive to elevated temperatures, resulting in a drastic reduction of flower diameter that was almost independent of flower load. We demonstrated that the temperature-mediated flower size reduction occurred due to a shorter growth period, and a lower rate of corolla cell division. Consistently, local application of cytokinin, a phytohormone that promotes cell division, resulted in recovery of flower dimensions when grown under elevated temperatures. Hormone analysis of temperature-inhibited flower buds revealed no significant changes in levels of cytokinin, and a specific increase of abscisic acid (ABA) levels, known to inhibit cell division. Moreover, local application of ABA on flower buds caused a reduction of flower dimensions as a result of lower levels of cell division, suggesting that ABA mediates the reduction of flower size at elevated temperatures. Taken together, our results shed light on the mechanism by which elevated temperatures decrease petunia flower size, and show that temperature-mediated reduction of flower size can be alleviated by increasing the cytokinin/ABA ratio.

Note:
Related Files :
Abscisic acid
Cell Division
Flower development
Flower size
Hormone interaction
Hot growth conditions
Show More
Related Content
More details
DOI :
10.1007/s00425-021-03807-w
Article number:
0
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
57385
Last updated date:
02/03/2022 17:27
Creation date:
29/12/2021 00:45
Scientific Publication
Abscisic acid mediates the reduction of petunia flower size at elevated temperatures due to reduced cell division
255
  • Archit Sood, 
  • Shai Duchin, 
  • Zahar Adamov, 
  • Mira Carmeli-Weissberg, 
  • Felix Shaya  
  • Ben Spitzer-Rimon 
Abscisic acid mediates the reduction of petunia flower size at elevated temperatures due to reduced cell division

Flower size is one of the most important showy traits in determining pollinator attraction, and a central factor determining the quality of floricultural products. Whereas the adverse effects of elevated temperatures on showy traits have been described in detail, its underlining mechanisms is poorly understood. Here, we investigated the physiological mechanism responsible for the reduction of flower size in petunia under elevated temperatures. We found that the early stages of flower-bud development were most sensitive to elevated temperatures, resulting in a drastic reduction of flower diameter that was almost independent of flower load. We demonstrated that the temperature-mediated flower size reduction occurred due to a shorter growth period, and a lower rate of corolla cell division. Consistently, local application of cytokinin, a phytohormone that promotes cell division, resulted in recovery of flower dimensions when grown under elevated temperatures. Hormone analysis of temperature-inhibited flower buds revealed no significant changes in levels of cytokinin, and a specific increase of abscisic acid (ABA) levels, known to inhibit cell division. Moreover, local application of ABA on flower buds caused a reduction of flower dimensions as a result of lower levels of cell division, suggesting that ABA mediates the reduction of flower size at elevated temperatures. Taken together, our results shed light on the mechanism by which elevated temperatures decrease petunia flower size, and show that temperature-mediated reduction of flower size can be alleviated by increasing the cytokinin/ABA ratio.

Scientific Publication
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