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Comparative effect of 28-homobrassinolide and 24-epibrassinolide on the performance of different components influencing the photosynthetic machinery in Brassica juncea L.(Report)

Siddiqui, Husna ; Ahmed, Khan Bilal Mukhtar ; Hayat, Shamsul

Plant Physiology et Biochemistry, 2018, Vol.129, p.198 [Periódico revisado por pares]

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  • Título:
    Comparative effect of 28-homobrassinolide and 24-epibrassinolide on the performance of different components influencing the photosynthetic machinery in Brassica juncea L.(Report)
  • Autor: Siddiqui, Husna ; Ahmed, Khan Bilal Mukhtar ; Hayat, Shamsul
  • Assuntos: Machinery – Physiological Aspects ; Photosynthesis – Physiological Aspects ; Hydrogen Peroxide – Physiological Aspects ; Plant Biochemistry – Physiological Aspects ; Enzymes – Physiological Aspects ; Superoxides – Physiological Aspects ; Antioxidants (Nutrients) – Physiological Aspects
  • É parte de: Plant Physiology et Biochemistry, 2018, Vol.129, p.198
  • Descrição: Keywords PSII efficiency; Electron transport rate; Stomatal conductance; Net photosynthetic rate; Reactive oxygen species; Elemental composition Highlights * Both HBL (10.sup.-8M) and EBL (10.sup.-8M) promote photosynthesis in Brassica juncea. * BRs enhance PSII activity, stomatal movement, leaf gas exchange parameters and sugar content. * BRs reduce hydrogen peroxide and superoxide content by enhancing the antioxidant enzyme activity. * BRs improve elemental status and also enhance root cell viability. * Effects of EBL exceeds over those of HBL. Abstract BRs are polyhydroxylated sterol derivatives, classified as phytohormones. Plants of Brassica juncea var. Varuna were grown in pots and an aqueous solution (10.sup.-8 M) of two brassinosteroid isomers 28-homobrassinolide (HBL) and 24-epibrassinolide (EBL) of same concentration (10.sup.-8 M) was applied to their leaves. The treatment up-regulated the photosynthetic machinery directly by enhancing water splitting activity, photochemical quenching, non-photochemical quenching, maximum PSII efficiency, actual PSII efficiency, electron transport rate, stomatal movement, stomatal conductance, internal CO.sub.2 concentration, transpiration rate, net photosynthetic rate and carbohydrate synthesis. Moreover, the level of biochemical enzymes (carbonic anhydrase and nitrate reductase), reactive oxygen species (superoxide and hydrogen peroxide) generation, antioxidant enzyme activity and mineral status (C, N, Mg, P, S, K), which indirectly influence the rate of photosynthesis, also improved in the treated plants. Out of the two BR analogues tested, EBL excelled in its effects over HBL. Author Affiliation: Plant Physiology Section, Department of Botany, Aligarh Muslim University, Aligarh 202002, India * Corresponding author. Article History: Received 4 May 2018; Accepted 26 May 2018 Byline: Husna Siddiqui, Khan Bilal Mukhtar Ahmed, Shamsul Hayat [hayat_68@yahoo.co.in] (*)
  • Idioma: Inglês

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