Physiological response of potato leaves to uniconazole under drought stress during the tuber expansion period

IF 2.4 3区 农林科学 Q1 Agricultural and Biological Sciences Horticulture Environment and Biotechnology Pub Date : 2024-03-25 DOI:10.1007/s13580-024-00612-8
Kaixin Ding, Ying Shan, Lichun Wang, Guokui Tian, Fengyun Li, Haiyan Wang, Ze Pang, Yang Pan, Hui Jiang
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Abstract

Long-term drought stress has irreversible effects on potato growth and reduces yield. Uniconazole can alleviate the growth inhibition and plant damage resulting from drought stress. In the current study, the effects of drought stress on the leaf physiology and yield of two potato varieties (Kexin No. 1, drought-tolerant, and Atlantic, drought-sensitive) and the ability of uniconazole to promote growth and productivity under drought conditions were studied. The results showed that uniconazole could effectively alleviate the degradation of chlorophyll under drought stress, and drought significantly inhibited the photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductance (Gs), and intercellular CO2 concentration (Ci) of the leaves of the two potato varieties. Exogenous uniconazole effectively alleviated the inhibitory effect of drought on the photosynthetic parameters of potato leaves. Compared with drought treatment, uniconazole treatment reduced malondialdehyde (MDA), hydrogen peroxide (H2O2) and superoxide anion (O2) production in the leaves of Kexin No. 1 and Atlantic plants and increased the activity of antioxidant enzymes, alleviating the loss of yield factors caused by drought stress. In addition, the antioxidant enzyme activity and nonenzymatic antioxidant activity of both varieties increased in response to drought stress. Drought + uniconazole treatment further increased the contents of the osmotic adjustment substances soluble protein and proline and ascorbate-glutathione (ASA-GSH) cycle products and substrates, including ascorbic acid (ASA), dehydroascorbate (DHA), glutathione (GSH) and oxidized glutathione (GSSG). Drought + uniconazole treatment also increased the ratio of ASA/DHA and GSH/GSSG in the two potato varieties under drought stress. This enhancement elevated the levels of reducing power and antioxidant capacity in the leaves, thus reducing the impacts of reactive oxygen species on the cell membrane. The drought-tolerant variety Kexin No. 1 exhibited a greater recovery than did the drought-sensitive variety Atlantic. These results provide a valuable reference for understanding the mechanism of drought resistance in potato plants and the effectiveness of uniconazole in alleviating drought-induced stress.

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块茎膨大期干旱胁迫下马铃薯叶片对烯效唑的生理反应
长期干旱胁迫会对马铃薯的生长造成不可逆的影响并降低产量。烯效唑可以缓解干旱胁迫对马铃薯生长的抑制和对植株的伤害。在本研究中,研究了干旱胁迫对两个马铃薯品种(耐旱的科欣 1 号和对干旱敏感的大西洋)叶片生理机能和产量的影响,以及咪鲜胺在干旱条件下促进生长和提高产量的能力。结果表明,在干旱胁迫下,咪唑能有效缓解叶绿素降解,干旱显著抑制了两个马铃薯品种叶片的光合速率(Pn)、蒸腾速率(Tr)、气孔导度(Gs)和细胞间二氧化碳浓度(Ci)。外源烯效唑能有效缓解干旱对马铃薯叶片光合参数的抑制作用。与抗旱处理相比,烯效唑处理降低了克新1号和大西洋植株叶片中丙二醛(MDA)、过氧化氢(H2O2)和超氧阴离子(O2-)的产生,提高了抗氧化酶的活性,减轻了干旱胁迫造成的产量因子损失。此外,两个品种的抗氧化酶活性和非酶抗氧化活性在干旱胁迫下均有所提高。干旱+烯效唑处理进一步增加了渗透调节物质可溶性蛋白和脯氨酸的含量,以及抗坏血酸-谷胱甘肽(ASA-GSH)循环产物和底物的含量,包括抗坏血酸(ASA)、脱氢抗坏血酸(DHA)、谷胱甘肽(GSH)和氧化谷胱甘肽(GSSG)。干旱+烯效唑处理也提高了干旱胁迫下两个马铃薯品种的 ASA/DHA 和 GSH/GSSG 比率。这种增强提高了叶片中还原力和抗氧化能力的水平,从而减少了活性氧对细胞膜的影响。耐旱品种 "科欣 1 号 "比干旱敏感品种 "大西洋 "的恢复能力更强。这些结果为了解马铃薯植物的抗旱机理以及烯效唑缓解干旱引起的胁迫的有效性提供了有价值的参考。
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来源期刊
Horticulture Environment and Biotechnology
Horticulture Environment and Biotechnology Agricultural and Biological Sciences-Horticulture
CiteScore
4.30
自引率
4.20%
发文量
0
审稿时长
6 months
期刊介绍: Horticulture, Environment, and Biotechnology (HEB) is the official journal of the Korean Society for Horticultural Science, was launched in 1965 as the "Journal of Korean Society for Horticultural Science". HEB is an international journal, published in English, bimonthly on the last day of even number months, and indexed in Biosys Preview, SCIE, and CABI. The journal is devoted for the publication of original research papers and review articles related to vegetables, fruits, ornamental and herbal plants, and covers all aspects of physiology, molecular biology, biotechnology, protected cultivation, postharvest technology, and research in plants related to environment.
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