Abstract
Triazole fungicide triadimefon (bayletone) is a broad systemic fungicide used in agriculture as screening agent. Triadimefon interferes with plant sterol biosynthesis leading to a changeable sterol profile, consequently morphological and cytological abnormalities. Its effect on banana cultivars was studied using shoot-tip cultures placed on Murashige and Skoog solid medium supplemented with 5 mg/L of 6-benzylaminopurine (BAP). The growth and proliferation of triadimefon treated shoot-tip cultures of the three-dessert banana cultivars (Hindi, Basrai and Williams) were affected compared to the control. The optimum culture conditions for root formation were obtained in the case of sub-culturing. The excised shoot cultures into Murashige and Skoog solid medium were supplemented with 1 mg/L indole-3-butyric acid (IBA). The efficiency of root system formation decreased as fungicide concentration increased. Many variations were observed among chlorophyll, carotenoids and protein contents of triadimifon (50 mg/L) treated cultures and untreated ones. High decrease was observed among the usual sterol content of triadimifon (50 mg/L) treated shoot buds compared to the control. Key words: Banana, cultivars, fungicides, proliferation, shoot-tips, sterol biosynthesis, triadimefon, triazoles.
Highlights
INTRODUCTIONTriazole fungicides could have side effect on the host plant, in some cases undesirable phytotoxic effects can occur which may limit or affect the growth and development (Gopi et al, 2008; Asami et al, 2003)
The results of our work showed that the viability of shoot-tip explants of the three banana cultivars, Hindi, Basrai and Williams decreased as well as the concentration of triadimefon increased
(2008) and Lu and Guo (2000) who reported that triazole fungicides affected many plant growth properties
Summary
Triazole fungicides could have side effect on the host plant, in some cases undesirable phytotoxic effects can occur which may limit or affect the growth and development (Gopi et al, 2008; Asami et al, 2003). Control I = Shoot-tip explants cultured on MS solid medium + 5 mg/L BAP. Control II = Shoot-tip explants cultured on MS solid medium +. Triazoles fuingicides increases the ratio of Chl a to b in the treated plants (Gopi et al, 2008), affect the protein contents and the rate of photosynthetic rate of treated plant (Gomathinayagam et al, 2008; Lu et al, 2000). The present study attempt to study the in vitro effect of triazole fungicide triadimefon on the growth and development of some banana cultivars and shed some light on its phytotoxic effect.
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