Abstract:

The effect of sink source ratio and position on partitioning of ¹⁴C photosynthates in Chinese Date was studied by¹⁴C tracer technique in this paper.The results showed that compared with one-fruit branch,¹⁴C specific activity of fruits of two\|fruit branch decreased while total¹⁴C photosynthates increased by 6.68%. The proportion of photosynthates exported from remained leaves was raised by 17.06% when the leaves of fruit branch were removed(half of all),and the proportion of labeled photosynthates imported to fruits was also raised by 15 26%;The photosynthates exchanged mutually among fruit branches at the same mother branch; The other side leaves could provide fruits with photosynthates when the same side leaves were removed. The reason of lower fruit set was also discussed.

Key words: Chinese Date (Zizyphus jujuba), Sink-source ratio, Sink source position, ¹⁴C photosynthates, Partitioning