Abstract
This study was designed to evaluate the role of growth regulator trinexapac and fungicides on growth, yield, and quality of winter rapeseed (Brassica napus L.). The experiment was conducted simultaneously at different locations in Germany using two cultivars of rapeseed. Five different fungicides belonging to the triazole and strobilurin groups, as well as a growth regulator trinexapac, were tested in this study. A total of seven combinations of these fungicides and growth regulator trinexapac were applied at two growth stages of rapeseed. These two stages include green floral bud stage (BBCH 53) and the course of pod development stage (BBCH 65). The results showed that plant height and leaf area index were affected significantly by the application of fungicides. Treatments exhibited induced photosynthetic ability and delayed senescence, which improved the morphological characters and yield components of rape plants at both locations. Triazole, in combination with strobilurin, led to the highest seed yield over other treatments at both experimental locations. Significant effects of fungicides on unsaturated fatty acids of rapeseed oil were observed. Fungicides did not cause any apparent variation in the values of free fatty acids and peroxide of rapeseed oil. Results of our study demonstrate that judicious use of fungicides in rapeseed may help to achieve sustainable farming to obtain higher yield and better quality of rapeseed.
Highlights
Different techniques such as osmo-priming, seed treatment, and application of chemicals used to induce growth of plants, are employed to achieve maximum seed yield [1]
Six fungicides belonging to triazole or strobilurin groups, along with growth regulator Moddus, were applied in seven combinations (Table 1) on two winter rapeseed cultivars, “Elektra” and “NK Fair”
The results of this study indicate that application of fungicides at BBCH 53 and 65 increased leaf area index (LAI) of rapeseed by delaying senescence, in comparison with application of triazole (Toprex) or strobilurin (Ortiva) fungicides, as well as control treatment,at the later stages of rapeseed in Giessen (Table 2)
Summary
Different techniques such as osmo-priming, seed treatment, and application of chemicals used to induce growth of plants, are employed to achieve maximum seed yield [1]. Several fungicides serve this purpose through altering cellular mechanisms of plant growth [2]. After the introduction of various modes of active fungicides, the concept of disease control gained new perspectives due to the positive physiological effects of these chemicals on plants [2]. Triazole fungicides affect the isoprenoid pathway and alter the levels of certain plant hormones by inhibiting gibberellin synthesis [5,6]. Triazole application reduced the rate of photosynthesis by decreasing the stomatal conductance [8]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
