Nibras Ihsan Abdul-Jabbar; Azizolah Khandan-Mirkohi; Seyed Alireza Salami; Hossein Saremi; Samira Shahbazi
Abstract
The current research explored the biocontrol ability of two strains of Trichoderma fungi on infected Freesia corm by Fusarium disease. Enhancements in plant growth and performance were evaluated in response to the Trichoderma fungi in laboratory and greenhouse conditions. Laboratory experiments included ...
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The current research explored the biocontrol ability of two strains of Trichoderma fungi on infected Freesia corm by Fusarium disease. Enhancements in plant growth and performance were evaluated in response to the Trichoderma fungi in laboratory and greenhouse conditions. Laboratory experiments included five Trichoderma strains, i.e., T1, T20, and Th4, related to T. harzianum species, T2 related to T. atroviride species, and Tvi related to T. virens species. A dual culture test and investigation of the inhibition and colonization rate were carried out with 11 treatments in three replications. Results revealed that strains T1 and T2 completely covered the pathogen in 96 h of culture by 70.02% and 68.98% and successfully inhibited the colonization of the disease agent by 84.53% and 82.72%, respectively, compared to the other strains. Then, a greenhouse experiment was performed with eight treatments, using suspensions of Trichoderma strains separately or combined with the presence of Fusarium fungus isolate on Freesia cultivation. The results showed that the strains at different levels were able to increase the growth and yield of Freesia plants and control Fusarium disease. In general, the T2 strain was more effective in increasing plant growth and flower stem height in Freesia. The T1 strain specifically improved the corm diameter. Both T1 and T2 strains demonstrated effectiveness in controlling and reducing the severity of Fusarium disease and enhancing the growth quality of Freesia.
ٍٍEbrahim Alami; Mahnaz Karimi
Abstract
One of the important objectives during the production cycle of ornamental plants is to regulate and control their growth. Hence, application of some plant growth regulators such as uniconazole (UN) and cycocel (CCC) is considered as an efficient method for reaching to this objective. To investigation ...
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One of the important objectives during the production cycle of ornamental plants is to regulate and control their growth. Hence, application of some plant growth regulators such as uniconazole (UN) and cycocel (CCC) is considered as an efficient method for reaching to this objective. To investigation the effect of uniconazole and cycocel on some morphological and biochemical characteristics of zinnia, a factorial experiment was conducted in a completely randomized design with five replications. Application of UN (0, 5 and 10 mg L-1) and CCC (0, 1000 and 1500 mg L-1) as growth retardants, was considered as the first and their application method (leaf spraying and soil application) was considered as the second factor. The effect of growth retardants on plant height, Time of flowering, peroxidase activity, endogenous gibberellins and leaf area were significant. The lowest plant height was observed in soil application of 10 mg L-1 UN. The tallest plant was observed in the control treatment. Growth retardants had significant effects on endogenous gibberellins and leaf chlorophyll contents. Highest activity of peroxidase enzyme was detected in plants treated by 10 mg L-1 UN. The highest and lowest numbers of leaves (21.6 and 16.4 leaves, respectively) were counted in control and 5 mg L-1 UN, respectively. According to the obtained results, the use of growth retardants is recommended to reduce the height and improve the qualitative and quantitative characteristics of zinnia flower.
