施钾与葡萄叶霜霉病发病的关系

Y. Pushpavathi, J. Satisha, K. Shivashankara, G. Satisha, S. Sriram, M. Reddy
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引用次数: 2

摘要

研究了不同钾源及施钾方式对“Sharad无核”葡萄叶片霜霉病发病的影响。分析了“Sharad无核”健康叶片和霜霉病叶片的总酚含量和单酚酸含量,发现霜霉病感染程度与叶柄钾含量有良好的相关性。不同施钾源和施钾方式对健康葡萄藤苯丙氨酸解氨酶(PAL)活性和预成型酚类物质有显著影响。PAL酶活性、总酚和单个酚酸随着疾病严重程度的增加而显著增加。PAL酶活性和总酚含量的百分比变化幅度在侵染最严重的葡萄树中最大。在酚酸中,邻香豆酸、对香豆酸具有一定的抗病作用。我们还可以观察到,接受不同钾源的葡萄病害严重程度的变化,钾源是通过土壤和/或施肥以不同数量提供的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Potassium fertilization in relation to downy mildew disease incidence in grape leaves
Influence of different sources of potassium and their method of application was studied on incidence of downy mildew infection in grape leaves of 'Sharad Seedless' (syn: 'Kishmish Chorni'). The total phenolic content and individual phenolic acids were analysed from healthy and downy mildew infected leaves of 'Sharad Seedless' and the degree of downy mildew infection was well correlated with potassium content in the petioles. Different sources and method of potassium application had significant effect on Phenylalanine ammonia-lyase (PAL) enzyme activity and preformed phenols in healthy vines. Significant increase in PAL enzyme activity, total phenols and individual phenolic acids was registered with increase in disease severity. Magnitude of percent change in PAL enzyme activity and total phenolic content was highest in vines with maximum disease infection. Among the phenolic acids, o-Coumaric acid, p-Coumaric acid have a definite role in disease resistance. We could also observe the variation in disease severity in vines which received different sources of potassium which was supplied in different quantities whether through soil and/or through fertigation.
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