Journal
AGRONOMY-BASEL
Volume 9, Issue 11, Pages -Publisher
MDPI
DOI: 10.3390/agronomy9110702
Keywords
antioxidant system; hickory plant; reactive oxygen species; water stress
Categories
Funding
- National Key Research and Development Program of China [2018YFD1000600, 2018YFD1000604]
- Key Project of Zhejiang Provincial Natural Science Foundation [LZ18C160001]
- National Natural Science Foundation of China [31901346, 31971695, 31470683, 31270716, 31070604]
- Independent Research Project of State Key Laboratory of Subtropical Silviculture, Zhejiang AF University [ZY20180208, ZY20180308]
- Open Foundation of State Key Laboratory of Subtropical Silviculture, Zhejiang AF University [KF201708]
- Overseas Expertise Introduction Project for Discipline Innovation (111 Project) [D18008]
- Key Research and Development Program of Zhejiang Province [2018C02004]
- National High Technology Research and Development Program of China (863 Program) [2013AA102605]
- Fruit Innovation Team Project of Zhejiang Province [2016C02052-12]
- Key Agricultural New Varieties Breeding Projects [2016C02052-13]
- Zhejiang Provincial Natural Science Foundation for Distinguished Young Scholar [LR13C160001]
- Open Foundation of First-class Discipline of Forestry, Zhejiang Province [201703]
- First-class General Financial Grant from the China Postdoctoral Science Foundation [2017M610377]
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Nowadays, drought is one of the major abiotic factors which negatively affects growth and development of several fruit tree species, including Chinese hickory plants (Carya cathayensis Sarg.). The present investigation was conducted to study the possible positive effects of melatonin in drought resistance of C. cathayensis plants along with associated mechanisms. It was observed that melatonin pre-treatment applied before limited water availability significantly contrasted drought-promoted negative effects in terms of plant growth and physiological responses. Significant improvement was observed in key biological parameters like relative water content, net photosynthetic rate, stomatal conductance, transpiration rate, maximum photosynthetic efficiency of photosystem II (PSII), and PSII electron transport rate. Antioxidant apparatus was also stimulated by melatonin and enhanced activities of superoxide dismutase (SOD), catalase (CAT), and ascorbate peroxidase (APX) were noticed along with higher accumulation of proline. Gene expression studies herein revealed that melatonin promoted the up-regulation of the expression of SOD (70.7%), CAT (32.7%), and APX (66.5%) genes. As a consequence, accumulation of malondialdehyde by-products and leaf symptoms were reduced in melatonin-treated plants. All these observations offer the clear evidence that pre-treatment with melatonin ameliorate the performance of Chinese hickory plants against drought stress.
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