Appraisal of the physio-biochemical efficacy of exogenously applied natural and synthetic sources of plant growth stimulants in modulating drought stress tolerance in maize (Zea mays L.)

IF 2.4 4区 生物学 Q2 PLANT SCIENCES
Abrar Ahmad, Nudrat Aisha Akram, Muhammad Ashraf
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Abstract

Phytoextracts as a cheap source of growth promoters as well as synthetic chemicals are being widely used these days to treat plants subjected to stress conditions. To compare the effects of natural growth regulators and synthetic ones, a pot experiment was conducted using natural [moringa leaf extract (MLE)] and synthetic (vitamins B1 and B2) sources to appraise the mitigating of drought-induced adverse effects on maize (Zea mays L.) plants. Seeds of both differentials stress tolerant maize cultivars (YH-1898 and Sahiwal Gold) were primed with natural (MLE), synthetic (thiamin and riboflavin), and their combination (MLE, thiamin, and riboflavin) and subjected to 100% field capacity [F.C. (control)] and 60% F.C. (drought) conditions. Drought stress (60% F.C.) significantly decreased plant biomass and total soluble proteins (TSP), whereas no significant alteration was observed in chlorophyll contents. However, in contrast, it improved glycine betaine (GB), proline, hydrogen peroxide (H2O2), malondialdehyde (MDA), total phenolics, and ascorbic acid as well as the activities of superoxide dismutase (SOD), catalase (CAT), and peroxidase (POD) enzymes in both maize cultivars. Priming seeds with different sources enhanced growth attributes, chlorophyll pigments, osmolyte concentration, total phenolics, ascorbic acid, and the activities of reactive oxygen species (ROS) scavenging enzymes (SOD, POD, and CAT), but it reduced the accumulation of H2O2 and MDA. Overall, a natural source, MLE as a plant growth regulator, remarkably reduced the adverse effects of drought stress and enhanced the growth of maize cultivars, whereas riboflavin among the synthetic PGRs was more effective in upregulating the oxidative defense and osmoprotectant accumulation.

外源天然和合成植物生长刺激剂调控玉米(Zea mays L.)抗旱性的生理生化效应评价
植物提取物作为一种廉价的生长促进剂和合成化学品的来源,目前被广泛用于治疗受胁迫条件的植物。为了比较天然生长调节剂和合成生长调节剂的效果,采用盆栽试验方法,采用天然[辣木叶提取物(MLE)]和合成(维生素B1和B2)源对玉米(Zea mays L.)植株的抗旱效应进行了评价。采用天然(MLE)、合成(硫胺素和核黄素)及其组合(MLE、硫胺素和核黄素)对两种差异抗旱玉米品种(YH-1898和Sahiwal Gold)的种子进行了100%田间处理(控制)]和60% F.C.(干旱)条件。干旱胁迫(60% F.C.)显著降低了植物生物量和总可溶性蛋白(TSP),而叶绿素含量无显著变化。然而,与此相反,它提高了甜菜碱(GB)、脯氨酸、过氧化氢(H2O2)、丙二醛(MDA)、总酚类物质和抗坏血酸,以及超氧化物歧化酶(SOD)、过氧化氢酶(CAT)和过氧化物酶(POD)酶的活性。不同来源的催熟提高了种子的生长特性、叶绿素色素、渗透物浓度、总酚类物质、抗坏血酸以及活性氧清除酶(SOD、POD和CAT)的活性,但降低了H2O2和MDA的积累。综上所述,天然来源MLE作为植物生长调节剂,显著降低了干旱胁迫的不利影响,促进了玉米品种的生长,而合成pgr中的核黄素则更有效地上调了氧化防御和渗透保护物质的积累。
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来源期刊
Acta Physiologiae Plantarum
Acta Physiologiae Plantarum 生物-植物科学
CiteScore
5.10
自引率
3.80%
发文量
125
审稿时长
3.1 months
期刊介绍: Acta Physiologiae Plantarum is an international journal established in 1978 that publishes peer-reviewed articles on all aspects of plant physiology. The coverage ranges across this research field at various levels of biological organization, from relevant aspects in molecular and cell biology to biochemistry. The coverage is global in scope, offering articles of interest from experts around the world. The range of topics includes measuring effects of environmental pollution on crop species; analysis of genomic organization; effects of drought and climatic conditions on plants; studies of photosynthesis in ornamental plants, and more.
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