Effect of anti-transpirant and auxin on wheat (Triticum aestivum L.) grain yield, yield-related traits, and germination

Objective: The grain yield of wheat is always limited by drought in arid and semiarid areas. Field and laboratory experiments were conducted to investigate the effects of anti-transpirants and auxins on grain yield, yield-related traits, and germination of wheat.Methods: The field experiment was carried out in the Chamchamal Plain of Kermanshah, Iran, using a split-plot design with three replications. Concentrations of auxin (۰, ۵۰, and ۱۰۰ ppm) were arranged in main plots, and anti-transpirant (sunflower oil) concentrations (۰, ۵, and ۱۰%) in subplots. ۲,۴-D + MCPA (۲-methyl-۴-chlorophenoxyacetic acid) were used as auxins. At the harvesting time (June ۲۰, ۲۰۱۴), several agronomic characteristics, including grain yield and single-grain weight, were measured. In addition, a laboratory experiment was conducted by choosing random seeds from the mother plants in the field experiment to study the effect of anti-transpirant and auxin on germination characteristics, including germination percentage, caulicle length, and radicle length.Results: Results showed that auxin application of ۱۰۰ ppm had the lowest single-grain weight. Anti-transpirant and auxin application had no significant effect on grain yield. Auxin concentration of ۱۰۰ ppm with an anti-transpirant application rate of ۰%, and an auxin application rate of ۱۰۰ ppm with an anti-transpirant concentration of ۱۰% resulted in the lowest harvest index.  Also, the auxin concentration of ۱۰۰ ppm with an anti-transpirant application rate of ۱۰% had the lowest seed germination. This is probably because hormonal and oil agents have mediated the increase in wheat seed germination inhibitors.Conclusion: Using auxin and anti-transpirant in the reproductive stage didn’t have a positive effect on grain yield, yield-related traits, and germination of seeds from mother plants in wheat. Also, auxin had a negative effect on the single-grain weight. Therefore, the studies about the effect of herbal anti-transpirants and auxin at the vegetative stage of wheat are recommended to gain further insight about the effectiveness of these compounds on agronomic traits in wheat.

کلیدواژه ها:

Harvest Index ، Maternal plant’s environment ، Phytohormone ، Transpiration ، Water-saving