Salicylic acid may be involved in the regulation of drought-induced leaf senescence in perennials: A case study in field-grown Salvia officinalis L. plants |
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| Authors: | M Elizabeth Abreu Sergi Munné-Bosch |
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| Institution: | 1. CITAB – Centre for the Research and Technology of Agro-Environmental and Biological Sciences, Universidade de Trás-os-Montes e Alto Douro, 5000-801 Vila Real, Portugal;2. Plant Physiology, Department B.O.S., Faculty of Biology, University of Oviedo, Oviedo, Asturias, Spain;3. Department of Biology & CESAM – Centre for Environmental and Marine Studies, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal;1. Department of Medicinal Plants, Arak Branch, Islamic Azad University, Arak, Iran;2. Department of Agronomy and Plant Breeding, Arak Branch, Islamic Azad University, Arak, Iran;3. Department of Medicinal Plants, Shahrekord Branch, Islamic Azad University, Shahrekord, 88146, Iran;4. Medicinal Plants Program, College of Natural Sciences, Massachusetts University, Amherst, 01003, MA, USA;1. Department of Animal Science, Institute of Agricultural Science and Technology, College of Agriculture & Life Science, Chonnam National University, Buk-Gwangju, P.O. Box 205, Gwangju, 61186, Republic of Korea;2. Korea Pear Research Organization, Chonnam National University, Gwangju, 61186, Republic of Korea;3. Environmentally-Friendly Agriculture (IEFA), Chonnam National University, Buk-Gwangju, P.O. Box 205, Gwangju, 61186, Republic of Korea;4. Division of Soil and Fertilizer, National Institute of Agricultural Science, RDA, Wanju, 55365, Republic of Korea;5. Biomaterial Analytical Laboratory, Central Instruments Facility, Gyeongsang National University, Jinju, 52828, Republic of Korea;1. Faculty of Pharmaceutical Sciences and Pharmaceutical Industries, Future University in Egypt, Cairo, 11835, Egypt;2. Faculty of Pharmacy, Cairo University, 11562, Egypt;3. Arab Company for Pharmaceuticals and Medicinal Plants (Mepaco Medifood), 11361, Egypt |
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| Abstract: | Leaf senescence is a highly regulated physiological process that contributes to nutrient remobilization during stress, thus allowing the rest of the plant to benefit from the nutrients accumulated during the life span of the leaf. Here we studied drought-induced leaf senescence in a perennial plant, common sage (Salvia officinalis L.) grown under Mediterranean field conditions, with an emphasis on the possible involvement of the phytohormones, salicylic acid and jasmonic acid in the process. The initial stages of leaf senescence (0–27 days of water deficit) were characterized by salicylic acid accumulation (by 80%) and decrease of jasmonic acid levels (by 40%), which occurred in parallel with a severe loss of photosynthetic pigments (up to 65%) and increases in the de-epoxidation state (DPS) of the xanthophyll cycle (by 55%), while the maximum efficiency of photosystem II (Fv/Fm ratio) was maintained above 0.80, thus indicating the absence of damage to the photosynthetic apparatus. The latest stages of leaf senescence (until 42 days of water deficit) were instead characterized by maintenance of the levels of jasmonic acid and salicylic acid, while β-carotene and the Fv/Fm ratio decreased significantly, which was followed by cell death. Exogenous applications of methyl salicylic acid in leaves of water-stressed plants led to reductions in chlorophyll levels, thus confirming the promoting effects of salicylic acid on leaf senescence. It is therefore concluded that salicylic acid may be involved, together with other phytohormones, in the regulation of drought-induced leaf senescence in perennials. |
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