Response of Morphological Traits and Chlorophyll Fluorescence of Paeonia lactiflora Leaves to Drought Stress and Evaluation of Drought Resistance

HUANG Rong; TANG Ling; WANG Weicheng; CHANG Qiang; LI Kuanying; HE Huan; PAN Yanhua

doi:10.11924/j.issn.1000-6850.casb2025-0287

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Chin Agric Sci Bull ›› 2026, Vol. 42 ›› Issue (1) : 92-102. DOI: 10.11924/j.issn.1000-6850.casb2025-0287

Response of Morphological Traits and Chlorophyll Fluorescence of Paeonia lactiflora Leaves to Drought Stress and Evaluation of Drought Resistance

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Abstract

The study aims to clarify the difference of drought resistance among different herbaceous peony varieties, and screen the varieties with excellent drought resistance. In this study, three herbaceous peony varieties ‘Sandianhong’, ‘Chunxiao’ and ‘Shala’ were used as experimental materials. The potted natural drought method was used to set 0 day (non-drought treatment), 7 days (moderate drought), and 14 days (severe drought) treatments. Leaf length, leaf width, leaf area, leaf circumference, leaf thickness, relative chlorophyll content, leaf nitrogen content, and chlorophyll fluorescence parameters were measured to comprehensively evaluate drought resistance through correlation analysis and principal component analysis. The results indicated that: (1) under drought stress, the leaf length, leaf width, leaf area and leaf circumference of the three P. lactiflora cultivars decreased gradually with the increase of drought stress, and the leaf thickness increased. (2) The relative chlorophyll content (SPAD) and leaf nitrogen content (LNC) of the three P. lactiflora varieties gradually decreased with the increase of drought duration, and the SPAD and LNC of the 14 days drought were significantly different from those of the 0 day drought (P<0.05). (3) The F₀ and F₀/Fm of three P. lactiflora varieties increased after 7 days of drought, and decreased after 14 days; Fv/F₀ decreased after 7 days of drought, but increased after 14 days; Fv, Fm, Fv/Fm and PI_abs decreased with the increase of drought duration. (4) The chlorophyll fluorescence O-J-I-P curves of the three P. lactiflora varieties gradually increased with time, and gradually became gentle when passing through the P point. Under drought stress, the leaf morphological traits and chlorophyll fluorescence parameters of P. lactiflora changed synergistically to adapt to drought environment. The drought resistance of three P. lactiflora varieties was ‘Shala’> ‘Chunxiao’> ‘Sandianhong’.

Key words

Paeonia lactiflora / drought stress / leaf morphological traits / chlorophyll fluorescence / kinetic curve / comprehensive evaluation / principal component analysis

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HUANG Rong , TANG Ling , WANG Weicheng , et al . Response of Morphological Traits and Chlorophyll Fluorescence of Paeonia lactiflora Leaves to Drought Stress and Evaluation of Drought Resistance[J]. Chinese Agricultural Science Bulletin. 2026, 42(1): 92-102 https://doi.org/10.11924/j.issn.1000-6850.casb2025-0287

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