Back to Search Start Over

Preliminary Study on Programmed Cell Death during Calyx Abscission of Korla Fragrant Pear.

Authors :
Wen, Yue
Shao, Baijunjie
Hao, Zhichao
Wang, Chunfeng
Sun, Tianyu
Han, Yutao
Tian, Jia
Zhang, Feng
Source :
Horticulturae; Jun2024, Vol. 10 Issue 6, p637, 18p
Publication Year :
2024

Abstract

Programmed cell death (PCD) is common in plant growth and development, such as xylem development, organ senescence, and abscission. Calyx abscission in Korla fragrant pear contributes to fruit quality, while it was not clear whether PCD occurred during calyx abscission and which signals regulated the process. Therefore, it is imperative to clarify the process of PCD in the process of calyx abscission in Korla fragrant pear under natural conditions to enrich the mechanism of calyx abscission. The results showed that the total time of calyx abscission of Korla fragrant pear began from 6 days after pollination (DAP) to 13 DAP, and the peak of calyx abscission occurred 10 DAP. During the whole process of calyx abscission, PCD started 6 DAP. At 9 DAP, the degree of PCD deepened. At 12 DAP, the cells in the abscission zone showed asymmetry on both sides, the organelles in the distal cells of the abscission zone degraded into apoptotic fragments, and the protective layer of the normal development of cells located at the proximal end of the abscission zone region ended the PCD process. ETH concentrations in the abscission zone of the decalyx fruit were significantly higher than those of the persistent calyx fruits in each period during calyx abscission, and high levels of ethylene and hydrogen peroxide and low contents of the GA<subscript>3</subscript>, ZT, and hydroxyl radicals promoted calyx abscission before the formation of the abscission zone. At 3 DAP, the ethylene concentration (43.97 ppm) and H<subscript>2</subscript>O<subscript>2</subscript> content (8.49 μmol/g) of decalyx fruit in the abscission zone were significantly higher than those of persistent calyx fruit by 67.69% and 27.86%, respectively; however, the GA<subscript>3</subscript>, ZT, and hydroxyl radicals showed the opposite. Overall, PCD in the abscission zone of decalyx fruits did occur during the calyx abscission of Korla fragrant pear, and ethylene and H<subscript>2</subscript>O<subscript>2</subscript> might play major roles in initiating the PCD process during Korla fragrant pear calyx abscission. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
23117524
Volume :
10
Issue :
6
Database :
Complementary Index
Journal :
Horticulturae
Publication Type :
Academic Journal
Accession number :
178193730
Full Text :
https://doi.org/10.3390/horticulturae10060637