Physiological Responses to Drought Stress and Drought Resistance Evaluation of Mainly Cultivated Camellia oleifera Varieties in Hubei Province
HU Rui
WANG Boying
YANG Xu
TANG Xiaoxiao
TAO Yutao
XU Huali
YANG Yuxin
AISAN Xiadiya
DU Kebing
Abstract：To investigate the physiological responses of the″Changlin series″Camellia oleifera varieties under drought stress,a controlled drought stress experiment lasting 70 days followed by a 7-day rehydration treatment was conducted.The drought resistance of five major Changlin series varieties(C.oleifera'Changlin 03,04,18,40,and 53')was evaluated.Leaf gas exchange parameters,chlorophyll fluorescence,relative chlorophyll content,relative membrane permeability,as well as physiological and biochemical indicators such as malondialdehyde,proline,superoxide anion,and hydrogen peroxide content were measured.The results revealed significant differences in drought resistance among the varieties.C.oleifera'Changlin 40'was found to exhibit the stronger drought resistance,with superior maintenance of photosynthetic efficiency,photosystem II functionality,and cellular integrity,along with lower reactive oxygen species accumulation and effective osmotic regulation.In contrast,C.oleifera'Changlin 53'was the more sensitive,showing a significant decline in photosynthetic activity and severe oxidative stress.A membership function analysis based on the drought resistance coefficients of the five varieties at 70 days of drought stress ranked their drought resistance in the following order:C.oleifera'Changlin 40'>C.oleifera'Changlin 04'>C.oleifera'Changlin 03'>C.oleifera'Changlin 18'>C.oleifera'Changlin 53'.This study provided a scientific basis for the selection and cultivation of drought-resistant C.oleifera varieties in arid regions,contributing to the enhancement of stress tolerance in the C.oleifera industry.
Keywords：Camellia oleiferadrought tolerancephysiological responsedrought stressChanglin series
Publication Date：2025-12-30
Online Publishing Date：2025-12-10(First online date of this platform, not the publication date of the document)
Pages：7( 458-463,510 )