Bermudagrass (Cynodon dactylon) is a widely used warm season turfgrass species with superior stress tolerance except for cold. In this study a comparative analyses of the responses to alkali stress in bermudagrass at the physiological and metabolomic levels were performed. Mild alkali with relatively low pH slightly inhibited growth of bermudagrass as evidenced by lower electrolyte leakage, more rapid growth and higher survival rate when compared to moderate and severe alkali treatments. Moreover, amount of 37 metabolites including amino acids, organic acids, sugars, and sugar alcohols were modulated by alkali treatments. Among them, 15 metabolites were involved in carbon and amino acid metabolic pathways. Under mild alkali stress, bermudagrass possibly slowed down metabolisms to maintain basic growth. However, moderate and severe alkali stressed plants accumulated significantly higher amount of carbohydrate which might result in carbon starvation. Taken together, alkali stress had severely inhibitory effect partially due to combined ionic stress and high pH stress. These results suggested that bermudagrass employed different strategies in response to alkali stresses with different pH and ionic values. This article is protected by copyright. All rights reserved.

中文翻译：

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狗牙根对碱胁迫的生理代谢组学反应

狗牙根（Cynodon dactylon）是一种广泛使用的暖季草坪草品种，除寒冷外具有优异的抗逆性。在这项研究中，对狗牙根在生理和代谢水平上对碱胁迫的反应进行了比较分析。与中度和重度碱处理相比，较低的电解质泄漏、更快的生长和更高的存活率证明了具有相对较低 pH 值的温和碱对狗牙根的生长有轻微抑制作用。此外，包括氨基酸、有机酸、糖和糖醇在内的 37 种代谢物的量通过碱处理进行调节。其中，15种代谢物参与碳和氨基酸代谢途径。在轻度碱胁迫下，狗牙根可能会减慢新陈代谢以维持基本生长。然而，中度和重度碱胁迫的植物积累了显着更多的碳水化合物，这可能导致碳饥饿。总之，碱胁迫具有严重的抑制作用，部分原因是离子胁迫和高 pH 胁迫的共同作用。这些结果表明，百慕大草采用不同的策略来应对不同 pH 值和离子值的碱胁迫。本文受版权保护。版权所有。本文受版权保护。版权所有。本文受版权保护。版权所有。