Yes, If you search papers on partitioning of photosynthates and nutrients from the leaves to grains in wheat and rice in the 1970s plant physiology journals you will get several articles on the subject.

I am attaching links to some recent publications on the subject.

http://link.springer.com/article/10.1023%2FA%3A1022156112243

http://link.springer.com/article/10.1023%2FA%3A1001076125525

http://www.scielo.br/scielo.php?pid=S1807-86212010000100021&script=sci_arttext

http://homepages.uwp.edu/higgs/lect9plant.pdf

Article Effect of source/sink manipulation on net photosynthetic rat...