Journal of Agriculture and Horticulture Research(JAHR)
ISSN: 2643-671X | DOI: 10.33140/JAHR
Impact Factor: 1.12
Sanders Jungle
QualiSud UMR95, CIRAD, Montpellier Université, InstitutAgro, F-34000 Montpellier, France
Publications
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Research Article
Evidence for a Leaf-to-Fruit Signal Regulating the Antioxidant System in Tomato Fruits Under Stress: Involvement of ABA, Ascorbate Redox State, H2 O2 and NO
Author(s): Ramzi Murshed*, Sanders Jungle, Huguette Sallanon, Laurent Urban and Felicie Lauri
In plants, environmental stresses trigger reactive oxygen species (ROS) overproduction, causing oxidative damage but also generating systemic signals that prime defense responses in distal organs. How such signals are transmitted from leaves to fruits is a key question for crop stress tolerance and quality. Here, tomato plants were subjected to mercury chloride (5 ppm HgCl2 ) for 24 hours to induce a selective arrest of water flux and to evaluate oxidative parameters and antioxidant defense in leaves, fruit peduncles and fruits. Mercury treatment induced oxidative damage — evidenced by increased H2O2 and MDA accumulation — in leaves and fruit peduncles, while fruits remained unaffected. Nevertheless, antioxidant enzyme activities (SOD, CAT, APX, DHAR and MDHAR) and transcript levels of SlAPXcyto, SlAPXt, SlDHAR1, SlDHAR2 and SlMDHAR were upregulated in fruits, despite the .. Read More»