Salicylic acid and H 2 O 2 seed priming alleviates Fe deficiency through the modulation of growth, root acidification capacity and photosynthetic performance in Sulla carnosa.

Autor: Jelali N; Laboratory of Extremophile Plants, Centre of Biotechnology of Borj-Cedria, BP 901, Hammam-Lif 2050, Tunisia. Electronic address: nahidajelali@yahoo.fr., Ben Youssef R; Laboratory of Extremophile Plants, Centre of Biotechnology of Borj-Cedria, BP 901, Hammam-Lif 2050, Tunisia., Boukari N; Laboratory of Extremophile Plants, Centre of Biotechnology of Borj-Cedria, BP 901, Hammam-Lif 2050, Tunisia., Zorrig W; Laboratory of Extremophile Plants, Centre of Biotechnology of Borj-Cedria, BP 901, Hammam-Lif 2050, Tunisia., Dhifi W; UR Ecophysiologie Environnementale et Procédés Agroalimentaires, Institut Supérieur de Biotechnologie de Sidi Thabet, BiotechPole de Sidi Thabet, Université de la Manouba, Ariana, Tunisia., Abdelly C; Laboratory of Extremophile Plants, Centre of Biotechnology of Borj-Cedria, BP 901, Hammam-Lif 2050, Tunisia.
Jazyk: angličtina
Zdroj: Plant physiology and biochemistry : PPB [Plant Physiol Biochem] 2021 Feb; Vol. 159, pp. 392-399. Date of Electronic Publication: 2020 Nov 25.
DOI: 10.1016/j.plaphy.2020.11.039
Abstrakt: Iron (Fe) is one of the essential nutrients for plant growth which is involved in several physiological functions. Hence, there are intensive efforts to improve plant tolerance to Fe deficiency, by genotypic screening and by the use of adapted physiological tools. The intend of the current study was to explore the seed priming effect with salicylic acid (SA 0.25 mM) and hydrogen peroxide (H 2 O 2 20 mM), either separately applied or combined, on plant growth, nutritional elements status (Fe and potassium K), root acidification and photosynthetic activity in two S. carnosa cultivars (Sidi Khlif and Kalbia) with different tolerance to such constraint. Under unprimed conditions, Fe deficiency decreased plant growth, chlorophyll concentration, in addition to Fe and K contents. Moreover, it affected the photosynthetic activity by inhibiting the net CO 2 assimilation rate and increasing the transpiration rate of both cultivars, following a reduced water use efficiency. The changes above described were much less pronounced in Sidi Khlif than in Kalbia. The stomatal conductance increased in Fe-deficient leaves of both cultivars, suggesting that the photosynthesis impairment should be attributed to non-stomatal factors. Interestingly, priming seeds with both agents significantly improved the growth performance and the rhizosphere acidification of deficient S. carnosa plants. However, the D + SA + H 2 O 2 treatment had the most beneficial effect on S. carnosa plant growth. The degree of this stimulation may vary depending on the cultivar, the tissue and the priming agent applied. This could be owing to the photosynthetic performance modulation, leading to more efficient nutrient uptake.
(Copyright © 2020 Elsevier Masson SAS. All rights reserved.)
Databáze: MEDLINE
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