The current study was carried out to assess the influence of trehalose, a non-reducing disaccharide involved in improving plant stress tolerance, on two cultivars (Hysun 33 and FH 598) of sunflower (Helianthus annuus L.) grown under control and drought stress conditions. At pre-flowering stage, varying concentrations (10, 20 and 30 mM) of trehalose were applied to the foliage. Drought stress significantly suppressed the plant growth, total soluble proteins, chlorophyll, achene yield per plant, oil percentage, organic contents, as well as oil palmitic and linoleic acids in both sunflower cultivars. External application of trehalose significantly reduced RMP (relative membrane permeability), and the accumulation of H2 O2 (hydrogen peroxide), while a considerable improvement was recorded in shoot fresh and shoot and root dry weights, total soluble proteins, glycinebetaine, AsA (ascorbic acid), total phenolics, achene yield per plant, oil contents, inorganic and organic contents, and the activities of catalase (CAT), superoxide dismutase (SOD) and peroxidase (POD) enzymes under water-limited regimes. The cultivar Hysun 33 was superior to the other cultivar in plant growth, RMP, glycinebetaine, proline, achene yield per plant, oil contents, and palmitic and linoleic acids. Overall, foliar-applied trehalose improved plant growth, oxidative defense system, yield and oil composition of sunflower under drought stress conditions. This article is protected by copyright. All rights reserved.

中文翻译：

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外源施用海藻糖对干旱胁迫下向日葵叶片生化、瘦果产量和油成分的影响

本研究旨在评估海藻糖（一种参与提高植物胁迫耐受性的非还原性二糖）对在控制和干旱胁迫条件下生长的向日葵（Helianthus annuus L.）的两个栽培品种（Hysun 33 和 FH 598）的影响. 在开花前阶段，将不同浓度（10、20 和 30 mM）的海藻糖施用于叶子。干旱胁迫显着抑制了两个向日葵品种的植物生长、总可溶性蛋白质、叶绿素、每株瘦果产量、油百分比、有机物含量以及油棕榈酸和亚油酸。外用海藻糖显着降低了 RMP（相对膜渗透性）和 H2O2（过氧化氢）的积累，同时记录了地上部鲜重、地上部和根干重的显着改善，总可溶性蛋白质、甘氨酸甜菜碱、AsA（抗坏血酸）、总酚类、每株瘦果产量、油含量、无机和有机含量，以及水下过氧化氢酶 (CAT)、超氧化物歧化酶 (SOD) 和过氧化物酶 (POD) 的活性- 有限的制度。品种 Hysun 33 在植物生长、RMP、甘氨酸甜菜碱、脯氨酸、每株瘦果产量、含油量以及棕榈酸和亚油酸方面优于其他品种。总体而言，在干旱胁迫条件下，叶面施用海藻糖改善了向日葵的植物生长、氧化防御系统、产量和油成分。本文受版权保护。版权所有。限水条件下的超氧化物歧化酶 (SOD) 和过氧化物酶 (POD) 酶。品种 Hysun 33 在植物生长、RMP、甘氨酸甜菜碱、脯氨酸、每株瘦果产量、含油量以及棕榈酸和亚油酸方面优于其他品种。总体而言，在干旱胁迫条件下，叶面施用海藻糖改善了向日葵的植物生长、氧化防御系统、产量和油成分。本文受版权保护。版权所有。限水条件下的超氧化物歧化酶 (SOD) 和过氧化物酶 (POD) 酶。品种 Hysun 33 在植物生长、RMP、甘氨酸甜菜碱、脯氨酸、每株瘦果产量、含油量以及棕榈酸和亚油酸方面优于其他品种。总体而言，在干旱胁迫条件下，叶面施用海藻糖改善了向日葵的植物生长、氧化防御系统、产量和油成分。本文受版权保护。版权所有。干旱胁迫条件下向日葵的产量和油组成。本文受版权保护。版权所有。干旱胁迫条件下向日葵的产量和油组成。本文受版权保护。版权所有。