Why would smaller seeds be more sensitive to saline water than larger seeds?

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So, we did an experiment where we exposed two different sizes of seeds to varying concentrations of salt water. The "small" seeds had, on average, shorter radicles than the larger seeds. So, it seems that smaller seeds are more sensitive to the saline solution.

I'm just a little confused as to why. All the lit. I've looked at doesnt seem to explain why such a thing occurs. I've assumed that there is more NaCl per mass unit for the smaller seeds but, thats as far as I've got it. Please help and cite sources used, if any. Thanks,
 

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