THE CONTRIBUTION OF REMOBILIZATION OF STORAGE MATERIALS IN WHEAT YIELD AS AFFECTED BY POTASSIUM IODIDE (KI)

Abstract

This investigation was conducted to study the accumulation and remobilization of storage materials (carbohydrate) and their contribution to wheat yield by using a split plot design in agricultural and natural resources research station of Torogh, Mashhad in the 2006 to 2007 growing season. The experiment included two levels of water status: 1-normal conditions (full irrigation) and 2- terminal water stress as main plot, 8 new wheat genotypes as sub plots, and 2 photosynthesis treatments: 1) using of current photosynthesis and 2) inhibition of current photosynthesis by applying a 0.4% solution of KI after spike appearance in sub-sub plots. Results showed that under terminal water stress condition, the percentage of storage material remobilization increased compared with the normal condition. Genotypes 9212, 9116 gave the highest biological (total dry matter yield) and grain yield and amount of reserve use was moderate, while genotypes C-81 - 10, 9103 had the highest percentage of storage remobilization.