|Table of Contents|

Comprehensive Evaluation of Chlorophyll Fluorescence Response and Heat Tolerance of Different Azalea Cultivars to High-temperature Stress

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Issue:
2025年6
Page:
82-89
Research Field:
Publishing date:

Info

Title:
Comprehensive Evaluation of Chlorophyll Fluorescence Response and Heat Tolerance of Different Azalea Cultivars to High-temperature Stress
Author(s):
XIA Xi; GONG Rui; LENG Hanbing; ZHANG Jie; ZHANG Chunying
(Shanghai Botanical Garden，Shanghai Urban Plant Resources Development and Application Engineering Research Center,Shanghai 200231)
Keywords:
Azalea; high temperature stress; chlorophyll fluorescence; principal component analysis
PACS:
S 685.21
DOI:
10.11937/bfyy.20243338
Abstract:
Taking two hybrid combinations of Azalea，along with their parents and offspring as experimental materials,an artificially simulated high-temperature treatment (40 ℃) was employed to investigate the effects on the morphology and chlorophyll fluorescence parameters,in order to provide reference for revealing the response mechanism of photosynthetic apparatus to high temperature and screening of heat-resistant varieties of Azalea.The results showed that the contents of Fv/Fo，Fv/Fm and Fv′/Fm′ of Azalea seedlings were all declined significantly under high temperature stress，and the variation range increased linearly with the intensity of the stress.Under high temperature stress，NPQ increased in heat-resistant varieties and decreased in heat-sensitive varieties.Principal component analysis showed that both parents and progeny ‘Yanzhi’ in hybrid combination 1 had good heat resistance，and the heat dissipation mechanism was activated to adapt to high environmental temperature after being subjected to high temperature stress.The comprehensive evaluation of correlation analysis indicate that the heat tolerance sequence of seven varieties of azaleas was ‘Zihe’＞‘Hongpingguo’＞‘Yanzhi’＞‘Baihe’＞‘Yanxiu’＞‘Fenhongpaopao’＞‘Yuxiu’，in accordance with their behavior in the field.The cultivars with higher heat-tolerance were ‘Hongpingguo’ and ‘Yanzhi’ which could be applied to city landscape and partly substitute conventional cultivar ‘Zihe’.

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Last Update: 2025-04-03