Singh-Sangwan Neelam, Abad Farooqi A H, Singh Sangwan Rajender
Division of Plant Physiology and Biochemistry, Central Institute of Medicinal and Aromatic Plants, P.O. CIMAP, Lucknow-226015, India.
New Phytol. 1994 Sep;128(1):173-179. doi: 10.1111/j.1469-8137.1994.tb04000.x.
Two lemongrasses. Cymbopogon nardus. (L.) Rendle var. confertiflorus (Steud.) Bor. and Cymbopogon pendulus (Steud.) Wats, were grown under mild and moderate water stress for 45 and 90 d. The impact of in situ drought stress on plants in terms of relative water content, $pS, concentration of proline, activities of PEP carboxylase and geraniol dehydrogenase, and geraniol and citral biogenesis, were investigated. The results revealed that the specific exhibited differential responses under mild and moderate stress treatments. In general, plant growth was reduced considerably whilst the level of essential oils was maintained or enhanced. Significant induction in catalytic activity of PKP carboxylase under water stress was one of the consistent metabolic responses of the aromatic grasses. The major oil constituents., geraniol and citral, increased substantially in both the species. Activity of geraniol dehydrogenase was also modulated under moisture stress. The responses varied depending Upon the level and duration of moisture stress. The observations have been analyzed in terms of possible relevance of some of these responses to their drought stress adaptability tolerance.
两种香茅，即爪哇香茅（Cymbopogon nardus. (L.) Rendle var. confertiflorus (Steud.) Bor）和垂叶香茅（Cymbopogon pendulus (Steud.) Wats），在轻度和中度水分胁迫条件下分别种植45天和90天。研究了原位干旱胁迫对植株相对含水量、水势、脯氨酸浓度、磷酸烯醇式丙酮酸羧化酶（PEP羧化酶）和香叶醇脱氢酶活性以及香叶醇和柠檬醛生物合成的影响。结果表明，这两个品种在轻度和中度胁迫处理下表现出不同的反应。总体而言，植株生长显著降低，而精油含量保持不变或有所增加。水分胁迫下PEP羧化酶催化活性的显著诱导是芳香草类植物一致的代谢反应之一。两个品种中的主要油类成分香叶醇和柠檬醛均大幅增加。香叶醇脱氢酶的活性在水分胁迫下也受到调节。这些反应因水分胁迫的程度和持续时间而异。已根据其中一些反应与其干旱胁迫适应性和耐受性的可能相关性对这些观察结果进行了分析。
