Induce Systemic Resistance in Lupine Against Root Rot Diseases

Abstract

Root rot caused by soil borne pathogenic fungi is the most sever disease attacks lupine plants. Isolation trials from diseased plants in some areas of Dakahlia Province (Egypt) was carried out. Rhizoctonia solani and Fusarium solani proved to be the most dominant isolates. Meanwhile, Fusarium oxysporum and Sclerotium rolfsii were less frequent. Efficacies of some plant resistance elicitors viz.: chitosan (CHI), Salicylic Acid (SA) and hydroquinone (HQ) in comparing to the fungicide Rhizolex T-50 as seed treatments showed significant reduction in the fungal growth in vitro. Chitosan at 8 g L(-1) and fungicide completely inhibited the growth of all isolated fungi, while SA at 1.4 g L(-1) and HQ at 1.2 g L(-1) inhibited the growth of Fusarium solani and F. oxysporum, respectively. The greenhouse experiments showed that S. rolfesii (No. 6) and R. solani (No. 2) followed by F. solani (No. 5) and F. oxysporum (No. 9) were the most aggressive root rot fungi. Soaking susceptible lupine seeds (Giza 1) in each one of the three selected elicitors showed a significant reduction in seedlings mortality. CHI at 8 g L(-1) was superior in increasing the percentage of healthy plants to record 72.5, 80.9, 62.7and 64.3%, when seeds were grown in soil infested with of F. solani, F. oxysporum, R. solani and S. rolfesii, respectively. These results were confirmed under field conditions in two different locations i.e., Tag El-Ezz and El-Serow Research Stations. CHI 8 g L(-1) proved to be the best elicitor after fungicide, in reducing lupine root rot disease. It showed 41 and 60% reduction in the plants mortality comparing to 56.37 and 69.13% in case of Rhizolex-T in Tag El-Ezz and El-Serow locations, respectively. The treatments were accompanied with a significant increase in lupine growth parameters, yield components and physiological aspects. Application of CHI at 8 g L(-1) or HQ at 1.2 g L(-1) was the most potent in this respect as compared to check treatment.

Down-Regulation of Damping-off and Root Rot Diseases in Lentil Using kinetin and Trichoderma.

“…This is may be due to plant seeds always requires treatment with fungicides to assure an adequate plant stand in the field. Similar findings were obtained by Abd-El-Kareem et al, (2004), Ali et al, (2009) and Abd El-Hai et al, (2010).…”

Green Chemistry for Inducing Resistance Against Chocolate Spot Disease of Faba Bean

“…An inverse relationship was found between the concentration of both antioxidants, micronutrient and the linear growth and mycelial dry weight of B. fabae when they applied individually or in combinations as shown in Table 4. These results are in agreement with Abd El-Hai et al (2007b), Wu et al (2008), Shabana et al (2008), Ali et al (2009), Aldesuquy et al (2014) and Seadh and El-Metwally (2015).…”

Management of some seed-borne pathogens attacking alfalfa plants in Saudi Arabia

“…phenolic and polyphenolic compounds) that are toxic to pathogens, either as part of their normal program of growth and development or in response to biotic stress (Lattanzio et al, 2006). In this connection, Ali et al (2009) reported that, total phenols content in lupine leaves significantly increased by HQ application. Phenolics are well-known as antifungal, antibacterial and antiviral compounds occur naturally in plants (Lattanzio et al, 2006).…”

“…of peanut. Also, Ali et al (2009) reported that HQ reduced significantly the mycelial growth of root rot pathogenic fungi attacking lupine plants. Cowan (1999) explained the mechanisms thought to be responsible for the phenolics toxicity to microorganisms on the basis of enzyme inhibition by the oxidized compounds, possibly through reaction with sulfohydryl groups or through more nonspecific interactions with the proteins.…”