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Glucose escalates PSII activity, dynamics between anabolic and catabolic pathways, redox and elemental status to promote the growth of Brassica juncea
South African Journal of Botany ( IF 3.1 ) Pub Date : 2021-03-01 , DOI: 10.1016/j.sajb.2020.09.041
Husna Siddiqui , Fareen Sami , Andrzej Bajguz , Shamsul Hayat

Abstract Glucose (Glc), a monosaccharide, accumulates in plants as a minor product of photosynthesis as well as a breakdown product of sucrose. Glucose regulates various physiological processes in plants; therefore, the present experiment was carried out to assess its role in mustard plants. Seeds of Brassica juncea were sown into pots filled with soil and farmyard manure. Glc treatments were provided as a foliar spray at the 25-day stage of growth for 5 days consecutively. Plants were sampled at the 30, 45 and 60-day stage of growth to assess various biological and biochemical parameters. Glc promoted the growth of plants in the following order of concentration: 30 mM > 20 mM > 40 mM > 10 mM > 50 mM > 0 mM. Glc treatment augmented photosynthetic efficiency by elevating primary photochemistry, stomatal movement and conductance, internal CO2 concentration, transpiration rate, and net photosynthetic rate leading to enhanced synthesis of carbohydrate. A decline in photosynthesis at higher sugar accumulation was prevented by its utilization during respiration. Moreover, the activity of photosynthetic (rubisco and carbonic anhydrase) and respiratory enzymes (hexokinase, succinate dehydrogenase, and fumarase) also increased, which suggests that Glc-mediated growth promotion depends on the dynamics between anabolic and catabolic pathways. Generation of reactive oxygen species, antioxidant enzyme activity, and elemental status, which affect the rate of photosynthesis, were also regulated in Glc-treated plants.

中文翻译:

葡萄糖提高 PSII 活性、合成代谢和分解代谢途径之间的动态、氧化还原和元素状态以促进芥菜的生长

摘要 葡萄糖 (Glc) 是一种单糖,作为光合作用的次要产物和蔗糖的分解产物在植物中积累。葡萄糖调节植物的各种生理过程;因此,进行本实验是为了评估其在芥菜植物中的作用。将芥菜种子播种到装满土壤和农家肥的盆中。Glc 处理在 25 天的生长阶段连续 5 天作为叶面喷雾提供。在第 30、45 和 60 天的生长阶段对植物取样,以评估各种生物和生化参数。Glc 按以下浓度顺序促进植物生长:30 mM > 20 mM > 40 mM > 10 mM > 50 mM > 0 mM。Glc 处理通过提高初级光化学、气孔运动和电导来提高光合效率,内部 CO2 浓度、蒸腾速率和净光合速​​率导致碳水化合物合成增强。通过在呼吸过程中利用它来防止在较高糖积累时光合作用的下降。此外,光合酶(rubisco 和碳酸酐酶)和呼吸酶(己糖激酶、琥珀酸脱氢酶和延胡索酸酶)的活性也增加,这表明 Glc 介导的生长促进取决于合成代谢和分解代谢途径之间的动态。在 Glc 处理的植物中,活性氧的产生、抗氧化酶活性和影响光合作用速率的元素状态也受到调节​​。通过在呼吸过程中利用它来防止在较高糖积累时光合作用的下降。此外,光合酶(rubisco 和碳酸酐酶)和呼吸酶(己糖激酶、琥珀酸脱氢酶和延胡索酸酶)的活性也增加,这表明 Glc 介导的生长促进取决于合成代谢和分解代谢途径之间的动态。在 Glc 处理的植物中,活性氧的产生、抗氧化酶活性和影响光合作用速率的元素状态也受到调节​​。通过在呼吸过程中利用它来防止在较高糖积累时光合作用的下降。此外,光合酶(rubisco 和碳酸酐酶)和呼吸酶(己糖激酶、琥珀酸脱氢酶和延胡索酸酶)的活性也增加,这表明 Glc 介导的生长促进取决于合成代谢和分解代谢途径之间的动态。在 Glc 处理的植物中,活性氧的产生、抗氧化酶活性和影响光合作用速率的元素状态也受到调节​​。这表明 Glc 介导的生长促进取决于合成代谢和分解代谢途径之间的动态。在 Glc 处理的植物中,活性氧的产生、抗氧化酶活性和影响光合作用速率的元素状态也受到调节​​。这表明 Glc 介导的生长促进取决于合成代谢和分解代谢途径之间的动态。在 Glc 处理的植物中,活性氧的产生、抗氧化酶活性和影响光合作用速率的元素状态也受到调节​​。
更新日期:2021-03-01
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