Effect of putresine and nutrients foliar application on some physiological characters of two wheat (Triticum aestivum L.) bread cultivars in Ahvaz

To study the effect of putresine and some essential nutrients foliar application on yield and physiological characters of wheat, an experiment was conducted during 2010-2011 growing season at research field of Shahid Chamran University as split plots based on randomized compelet block design. Results showed that putresine, Boron and Molybdenum foliar application during tillering+booting growth stages significantly increased grain yield in Chamran and Star. Using putresine significantly increased Leaf Area Duration (LAD) and Leaf Area Index (LAI). Foliar application of nutrients resulted in more CO2 assimilation and stomatal conductance as against control condition (without foliar application of nutrients), so leaf temperature significantly decreased. The highest respiration rate was observed in control and the lowest was measured in putresine treatment during tillering+booting. Foliar application increased both effective grain filling period and speed of grain filling. The speed of grain filling in control condition of Chamran cultivar was 91.27 mg.d-1 while application of putresine during tillering and booting stages increased that to 145.09 mg.d-1.Because of early spring hight temperatures in Ahvaz as one of the limiting factors in yield of wheat crop, it seems that foliar application of nutrients could be effective in increasing of net assimilation, LAD, LAI, stomatal conductance, grain filling period and grain yield.