Exogenous melatonin alleviated growth inhibition and oxidative stress induced by drought stress in apple rootstock

Biocell

article

JUAN GONG¹  CHUNHUI SONG¹  ZHENGYANG WANG¹  SHANGWEI SONG¹  JIAN JIAO¹  MIAOMIAO WANG¹  XIANBO ZHANG¹  TUANHUI BAI¹  MEIGE WANG¹ 

[1] College of Horticulture, Henan Agricultural University

关键词: Apple;    Chlorophyll fluorescence;    Drought;    Melatonin;    Photosynthesis;   

DOI  :  10.32604/biocell.2022.018934

学科分类：仪器

来源: Biocell

【 摘 要 】

Drought stress is one of the major environmental obstacles that limit the production and development of apples (Malus domestica Borkh.). The role of melatonin is well known in the protection of plants under environmental stresses. In this study, we investigated the effect of melatonin on apple rootstock M. hupehensis Rehd under drought stress. The results showed that drought inhibited the growth of M. hupehensis and dramatically reduced root surface area, root volume, the number of tips and forks, and root diameter. Drought-induced growth inhibition was significantly decreased by adding melatonin. Net photosynthetic rate (Pn), intercellular CO2 concentration (Ci), stomatal conductance (Gs), transpiration rate (Tr), were markedly reduced under drought stress. However, the application of melatonin could mitigate the damage to the photosynthetic apparatus and increase the quantum yield of PSII photochemistry. Additionally, generation of hydrogen peroxide (H2O2) and superoxide radicals (O2•–) sharply increased in apple leaves after 4 days under drought stress, and the accumulation of electrolyte leakage (EL) represented oxidative stress, while by applying melatonin under drought stress, the generation of O2•– and H2O2 were significantly reduced and protected the membrane from drought damages. These results suggest that the adverse effects of drought can be minimized by applying melatonin to apples.

【 授权许可】

CC BY