Melatonin Affects the Photosynthetic Performance of Pepper (<i>Capsicum annuum</i> L.) Seedlings under Cold Stress

Photosynthesis is an important plant metabolic mechanism that improves carbon absorption and crop yield. Photosynthetic efficiency is greatly hampered by cold stress (CS). Melatonin (ME) is a new plant growth regulator that regulates a wide range of abiotic stress responses. However, the molecular m...

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Main Authors: Muhammad Ahsan Altaf (Author), Huangying Shu (Author), Yuanyuan Hao (Author), Muhammad Ali Mumtaz (Author), Xu Lu (Author), Zhiwei Wang (Author)
Format: Book
Published: MDPI AG, 2022-12-01T00:00:00Z.
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042 |a dc 
100 1 0 |a Muhammad Ahsan Altaf  |e author 
700 1 0 |a Huangying Shu  |e author 
700 1 0 |a Yuanyuan Hao  |e author 
700 1 0 |a Muhammad Ali Mumtaz  |e author 
700 1 0 |a Xu Lu  |e author 
700 1 0 |a Zhiwei Wang  |e author 
245 0 0 |a Melatonin Affects the Photosynthetic Performance of Pepper (<i>Capsicum annuum</i> L.) Seedlings under Cold Stress 
260 |b MDPI AG,   |c 2022-12-01T00:00:00Z. 
500 |a 10.3390/antiox11122414 
500 |a 2076-3921 
520 |a Photosynthesis is an important plant metabolic mechanism that improves carbon absorption and crop yield. Photosynthetic efficiency is greatly hampered by cold stress (CS). Melatonin (ME) is a new plant growth regulator that regulates a wide range of abiotic stress responses. However, the molecular mechanism of ME-mediated photosynthetic regulation in cold-stressed plants is not well understood. Our findings suggest that under low-temperature stress (15/5 °C for 7 days), spraying the plant with ME (200 µM) enhanced gas exchange characteristics and the photosynthetic pigment content of pepper seedlings, as well as upregulated their biosynthetic gene expression. Melatonin increased the activity of photosynthetic enzymes (Rubisco and fructose-1, 6-bisphosphatase) while also enhancing starch, sucrose, soluble sugar, and glucose content under CS conditions. Low-temperature stress significantly decreased the photochemical activity of photosystem II (PSII) and photosystem I (PSI), specifically their maximum quantum efficiency PSII (Fv/Fm) and PSI (Pm). In contrast, ME treatment improved the photochemical activity of PSII and PSI. Furthermore, CS dramatically reduced the actual PSII efficiency (ΦPSII), electron transport rate (ETR) and photochemical quenching coefficient (qP), while enhancing nonphotochemical quenching (NPQ); however, ME treatment substantially mitigated the effects of CS. Our results clearly show the probable function of ME treatment in mitigating the effects of CS by maintaining photosynthetic performance, which might be beneficial when screening genotypes for CS tolerance. 
546 |a EN 
690 |a photosynthesis 
690 |a pigment molecules 
690 |a cold stress 
690 |a pepper 
690 |a melatonin 
690 |a Therapeutics. Pharmacology 
690 |a RM1-950 
655 7 |a article  |2 local 
786 0 |n Antioxidants, Vol 11, Iss 12, p 2414 (2022) 
787 0 |n https://www.mdpi.com/2076-3921/11/12/2414 
787 0 |n https://doaj.org/toc/2076-3921 
856 4 1 |u https://doaj.org/article/6f12a5bf14d543bab57c2f70d8cbb6d6  |z Connect to this object online.