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If you want to see your RIN score you can check for errors in the error pane. It may be something like the "5S Region Anomaly Threshold" error. Then you can increase the 5S Region Anomaly Threshold from 0.5 to 1 and it should clear the error and give you a RIN score. But the RIN score will be unduly low due to the amount of small RNAs you have. So it is probably not worth the trouble.
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Phillip
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Plant RNA per se, will not necessarily give you poor RIN scores. We have a recent set of wheat RNAs submitted that all gave RINs > 9.5.
I think, other than actual degradation, the factor that will most lower the RIN score is a high concentration of small RNAs. That is typical of some isolation methods -- the Trizol (or other acid phenol) methods allow much higher yields of low molecular weight RNAs. For some applications that is actually good (well, obviously for small RNA projects). But for normal RNAseq experiments it can cause issues.
But, yes, it is not uncommon for plants to have a bunch of weird peaks (frequently plastid rRNA).
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Phillip
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