Gibberellic acid improves seed germination and growth of Vicia faba plants subjected to clethodim herbicide

Document Type : Regular Articles

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Botany and Microbiology Department, Faculty of Science, Sohag University, Sohag 82524, Egypt

Abstract

Hazardous impacts of clethodim herbicide on seed germination, plant growth parameters, and leaf chlorophyll contents of faba bean cultivars (Vicia faba L. cv. Noubria 4 and Giza 843) as well as the benefit role of gibberellin on clethodim treated plants were investigated. Clethodim is one of the postemergence systemic herbicides that inhibits acetyl CoA carboxylase (ACCase). On this, it can indirectly affect the fatty acid synthesis required to build a various new cell membrane of growing tissues. The results showed that clethodim causes a negative effect on seed germination especially at higher concentration used (1.2 mM). At the seedling stage, the shoot and root lengths of both cultivars significantly decreased with increasing clethodim doses compared to the control. Combination treatments of GA3 + clethodim to seeds increased seed germination and root length compared to that only treated with the clethodim. At the growth stage, fresh and dry weights, and leaf area of both cultivars decreased with increasing clethodim doses, whereas GA3 treatments before three days of Clethodim treatment enhanced fresh and dry weights, and leaf area of clethodim treated and untreated of both Vicia faba cultivars.  Leaf pigment contents of both cultivars decreased in response to increasing clethodim doses. GA3 application (50 µM) to clethodim-treated and untreated plants increased pigment contents compared to those of the corresponding clethodim-treated and control plants. Among photosynthetic pigments, the chlorophyll a of both cultivars was much more sensitive to clethodim herbicide. The study suggests that the faba bean is seriously affected by clethodim treatments, especially at the seedling stage. GA3 spraying improved the seed germination, growth, and pigment contents of faba bean plants exposed to the clethodim stress.

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