> Three months ago I applied for renewal PR Card, and the
> application for PR Card renewal required guarantor's
> signature.
>
> Now I am applying for citizenship, and in the application I
> don't see any part that requires Guarantor's signature.
PR Card is travel document, while citizenship is a status, you
cannot compare the application. Citizenship application is more
comparable to PR application, for which you don't need guarantor
as well. PR Card application is comparable to passport
application, for which you do need guarantor.

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(stephan paul) Arif Sahari Wibowo
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Disclaimer: IANAL, IANALP, IANAMD, IANAMP, IANAAP
my statements - if any - should be treated as such.