What product is formed when $NH_{4}^{+}$ reacts with $\alpha$-ketoglutaric acid?

Complete the equation.
$\alpha$-ketoglutaric acid $+ NH_4^+ + NADPH \xrightarrow{\text{Glutamate dehydrogenase}} \dots \dots$

In the transpiration stream, the nodules of ..... plants export the fixed nitrogen as ureides.

In $Glycine \ max$,the product of biological nitrogen fixation is transported from the root nodules to other parts as

$A$: Soybean exports the fixed nitrogen as ureides.
$R$: Amides contain excess nitrogen and they are transported via phloem sieve tubes.

Explain the methods of amino acid synthesis in plants.