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<p>Drought stress is a global phenomenon that poses harmful impacts on crop growth and development leading to yield losses in oilseed crops. The present study investigated the role of foliar-applied silicon in alleviating the harmful effects of drought stress by improving antioxidant defense of Camelina genotypes. Additionally, a critical analysis was conducted on the various silicon levels in Camelina genotypes that were exposed to drought stress. Treatments were: (1) Different concentrations of silicon (Si), a) foliar applications; NS = no spray, WS= water spray, Si-2 = 2 mM Si, Si-4 = 4 mM Si, Si-6 = 6 mM Si, (b) drought stress; control = 100% field-capacity (FC) and drought stress = 50% FC, and (c) genotypes of camelina; 611 and 618. Drought stress caused marked reductions in the growth of camelina genotypes as compared with control-100% field capacity. Compared to control, drought stress decreased the shoot length of the camelina by 28%. Physiological attributes were also decreased under drought stress as photosynthetic rate, relative water content (RWC), and chlorophyll content were decreased by 35, 45, and 39% in camelina, respectively, as compared to control. Drought stress was found to increase oxidative damage in camelina genotypes. However, foliar applications of Si improved the morpho-physiological and biochemical attributes in camelina genotypes as compared to control-NS, and maximum values were observed when Si was applied at 4 mM. Silicon applications at 4 mM upregulated the activities of catalase, superoxide dismutase, and peroxidase by 17, 14, and 15% in camelina respectively, reducing the electrolyte leakage. Under drought stress, maximum improvements in plant performances were observed when Si was applied at 4 mM followed by 6 mM and 2 mM via foliar applications. Among the genotypes, camelina genotype 618 showed better performance as compared with 611. In crux, Si foliar application particularly at the rate of 4 mM improved the morpho-physiological and biochemical attributes in camelina genotypes under drought-stressed conditions. The better growth and greater drought tolerance of Si-applied plants were attributed to the maintenance of plant water status and photosynthetic pigments, lowered oxidative damage, and higher activities of antioxidant enzymes.</p>

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Foliar application of silicon alleviates adverse effect of drought stress by improving growth, physiological attributes, and antioxidant defense of camelina (Camelina sativa L.)

  • 期刊论文

  • 发表日期：

    2026年5月25日

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  • Bilal Ahmad Shahzad,
  • Ejaz Ahmad Waraich,
  • Muhammad Saleem,
  • Saddam Hussain,
  • Saifullah

摘要

Drought stress is a global phenomenon that poses harmful impacts on crop growth and development leading to yield losses in oilseed crops. The present study investigated the role of foliar-applied silicon in alleviating the harmful effects of drought stress by improving antioxidant defense of Camelina genotypes. Additionally, a critical analysis was conducted on the various silicon levels in Camelina genotypes that were exposed to drought stress. Treatments were: (1) Different concentrations of silicon (Si), a) foliar applications; NS = no spray, WS= water spray, Si-2 = 2 mM Si, Si-4 = 4 mM Si, Si-6 = 6 mM Si, (b) drought stress; control = 100% field-capacity (FC) and drought stress = 50% FC, and (c) genotypes of camelina; 611 and 618. Drought stress caused marked reductions in the growth of camelina genotypes as compared with control-100% field capacity. Compared to control, drought stress decreased the shoot length of the camelina by 28%. Physiological attributes were also decreased under drought stress as photosynthetic rate, relative water content (RWC), and chlorophyll content were decreased by 35, 45, and 39% in camelina, respectively, as compared to control. Drought stress was found to increase oxidative damage in camelina genotypes. However, foliar applications of Si improved the morpho-physiological and biochemical attributes in camelina genotypes as compared to control-NS, and maximum values were observed when Si was applied at 4 mM. Silicon applications at 4 mM upregulated the activities of catalase, superoxide dismutase, and peroxidase by 17, 14, and 15% in camelina respectively, reducing the electrolyte leakage. Under drought stress, maximum improvements in plant performances were observed when Si was applied at 4 mM followed by 6 mM and 2 mM via foliar applications. Among the genotypes, camelina genotype 618 showed better performance as compared with 611. In crux, Si foliar application particularly at the rate of 4 mM improved the morpho-physiological and biochemical attributes in camelina genotypes under drought-stressed conditions. The better growth and greater drought tolerance of Si-applied plants were attributed to the maintenance of plant water status and photosynthetic pigments, lowered oxidative damage, and higher activities of antioxidant enzymes.