Na+ exclusion and proline accumulation in Urochloa spp. cultivars

IF 0.7 4区 农林科学 Q3 AGRICULTURE, MULTIDISCIPLINARY
Cicero Lucas da Silva, Rita de Cássia Alves de Britto Ferreira, J. Alvarez-Pizarro
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引用次数: 0

Abstract

Abstract The objective of this work was to evaluate the effect of salinity on Na+ and K+ distribution and on proline content in Urochloa brizantha and Urochloa decumbens grass cultivars. Plants were grown in nutrient solution and subjected to salt stress for nine days. Shoot and root lengths and proline, total chlorophyll, K+, and Na+ contents were determined. Salt stress reduced the shoot length of cultivar Marandu but not of Xaraés and Basilisk. Total chlorophyll content was not affected by salinity in U. brizantha cultivars, but increased in cultivar Basilisk of U. decumbens. Salt-induced proline accumulation was observed in all cultivars, with a higher increase in Marandu. The K+ content in leaf blades increased in the Marandu and Basilisk cultivars under salinity conditions. 'Basilisk' showed Na+ exclusion in shoot tissues, whereas 'Marandu' and 'Piatã', followed by 'Xaraés', exhibited a higher Na+ in leaf blades. The pattern of ion distribution among cultivars was attributed mainly to differences in the ability to control the ion transport from root to shoot, since the rates of ion uptake were similarly affected by salinity. Tolerance to salt stress in grasses of the Urochloa genus is associated to Na+ exclusion and not to proline accumulation in shoot tissues.
褐藻品种Na+排斥与脯氨酸积累
摘要本研究旨在探讨不同盐度对毛草和卧草品种Na+和K+分布及脯氨酸含量的影响。植物在营养液中生长,经受9天的盐胁迫。测定茎长、根长、脯氨酸、总叶绿素、K+、Na+含量。盐胁迫降低了品种马兰度的茎长,而降低了品种沙拉萨和蛇怪的茎长。总叶绿素含量不受盐度的影响,但有升高的趋势。盐诱导脯氨酸积累在所有品种中均有发生,以马兰度的增加幅度较大。盐渍条件下,马兰度和蛇怪叶片K+含量显著增加。“Basilisk”在茎部组织中表现出Na+的排除,而“Marandu”和“Piatã”在叶片中表现出更高的Na+,其次是“xara”。不同品种间离子的分布模式主要归因于控制离子从根到茎的运输能力的差异,因为离子吸收速率同样受到盐度的影响。尿藻属禾草对盐胁迫的耐受性与Na+排斥有关,而与茎部组织脯氨酸积累无关。
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来源期刊
Pesquisa Agropecuaria Brasileira
Pesquisa Agropecuaria Brasileira 农林科学-农业综合
CiteScore
1.20
自引率
0.00%
发文量
45
审稿时长
9-18 weeks
期刊介绍: Pesquisa Agropecuária Brasileira – PAB – is issued monthly by Empresa Brasileira de Pesquisa Agropecuária – EMBRAPA, affiliated to Ministry of Agriculture, Livestock and Food Supply. PAB publishes original scientific-technological articles on Plant Physiology, Plant Pathology, Crop Science, Genetics, Soil Science, Food Technology and Animal Science. Its abbreviated title is Pesq. agropec. bras., and it should be used in bibliographies, footnotes, references and bibliographic strips.
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