Augmenting the Tolerance Potential of  Muskmelon (Cucumis melo L.) Using Salicylic Acid

I. Ullah, H. Rahman, Kalim Ullah
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Abstract

Salicylic acid (SA) is considered an important plant hormone that controls many aspects of plant growth and development, as well as resistance to biotic and abiotic stresses. In current investigations, a pot experiment consisting of four different levels of SA (0, 1, 2 and 3 mM SA) were tested on growth and physiological attributes of muskmelon (Cucumis melo L.), grown at different salinity levels (0, 50, 100 mM NaCl). Results revealed that all the morphological and physiological attributes were significantly (P<0.05) adversely affected by salinity stress, whereas application of SA improved growth rate of muskmelon both in saline and non-saline conditions. SA treated plants showed higher total chlorophyll content, photosynthetic rate and stomatal regulations as compared to control plants. SA application reduced the salt deleterious effects by inhibiting toxic Na+ ions accumulation in leaf and increased K+/Na+ ratio. Among the various applied concentrations, 2 mM SA increased shoot fresh weight by (30%), dry weight (34%), leaf area (25%) and K+/Na+ ratio by (84%) as compared to control plants. Thus, 2 mM SA concentration is concluded to be the best ameliorative treatment in salt stressed environments to enhance the muskmelon production.  
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提高甜瓜(Cucumis melo L.)的耐受性使用水杨酸
水杨酸(Salicylic acid, SA)被认为是一种重要的植物激素,控制着植物生长发育的许多方面,以及对生物和非生物胁迫的抗性。本研究通过盆栽试验,研究了4种不同盐浓度(0、1、2和3 mM)下甜瓜(Cucumis melo L.)在不同盐浓度(0、50和100 mM NaCl)下的生长和生理特性。结果表明,盐胁迫对甜瓜的形态和生理性状均有显著影响(P<0.05),而盐胁迫对甜瓜生长均有促进作用。与对照植株相比,SA处理植株的总叶绿素含量、光合速率和气孔调节能力均有所提高。SA通过抑制叶片有毒Na+离子积累和提高K+/Na+比值来降低盐害效应。在不同施用浓度下,与对照植株相比,2 mM SA使植株鲜重提高了30%,干重提高了34%,叶面积提高了25%,K+/Na+比值提高了84%。因此,2 mM SA浓度是盐胁迫环境下提高甜瓜产量的最佳改良处理。
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