Role of nitrogen in controlling kernel abortion induced by nitrogen-deficient
SUN Qingyuan,ZHANG Xuesong (Coll. of Bio. & Food Technol.,Dalian Inst. of Light Ind., Dalian 116034, China)
The objective of this work is to determine whether the kernel abortion induced by nitrogendeficient is the direct result of N supply to the ear or the indirect result of limitation in photoassimilates. We steminfuse nitrogendeficient and nitrogensufficient plants, respectively, to provide additional sucrose, N, or similar amounts of both (N+sucrose). The nitrogendeficient plants are also steminfused with 15Nglycine and soil treatment of 15NNO3. Experimental results indicate that N plays a role of direct nutritional enhancement and an indirect enzyme effect on kernel development. The decrease of kernel abortion is due to increased kernel sink capacity, higher activities of both soluble and insoluble invertase, lower accumulation of reduced sugar in the endosperm, and greater assimilate utilization for starch synthesis.
【CateGory Index】： S513