Evaluation on Remobilization of Photosynthesis Materials in Conditions of Source and Sink Limitation in Corn Hybrid K.S.C. 704

ABSTRACT:In order to study the effect of remobilization of photosynthesis materials in restricted conditions of source and sink on corn hybrid K.S.C. 704, an experiment was conducted in Ahvaz during the summer 2011 on the randomized complete block design (RCBD) with three replications. Restricted condition of source and sink included; cutting the leaves above the maize, cutting the leaves below the maize and cutting half of the maize and not cutting the leaves as control. The results indicated that the change in the amount of current photosynthesis affected the remobilization.A significant decrease in amount of current photosynthesis was observed in the treatments of cutting leaves and also in eliminating lower leaves of the maize. Increasing amount of remobilization in treatments of cutting the leaves above the maize can be due to extreme decrease in amount of current photosynthesis, in which the plant tries to increase its remobilization so to compensate somehow the decrease. This is while the total currentphotosynthesis and remobilization was less comparing with the control. In other words, increasing the amount of remobilization in condition of cutting the leaves does not achieve compensating decrease in currentphotosynthesis. Cutting 50 percent of the corn – due to extreme decrease in number of grains and sinklimitation- did not fulfill increase of remobilization, yet sink limitation led to decrease of remobilization. Cutting 50% of the maize caused more decrease in biologic yield which is due to the greater role of maize in total yield as a sink for preserving nutrients.