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My teacher ask this question, and I answered 7 to 7.4, but she said it's wrong. I read a lot and found the same answer (wikipedia) I'm here asking for confirmation of this and the pH inside & outside of the tilakoidal membrane.

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  • $\begingroup$ What kind of plastid and which part(s) of the plastid? The wikipedia article on chloroplasts contains relevant information ... $\endgroup$
    – tyersome
    Jun 23, 2020 at 2:42
  • $\begingroup$ Thanks, that is kindly useful. Now, I just need a litle more confirmation. $\endgroup$
    – Adonis Cedeño
    Jun 23, 2020 at 2:56

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  • The optimum cytoplasmic pH for performing physiological activities in plant cells is a neutral pH of around 7.2 to 7.4.
  • The pH of apoplastic space outside plasma membrane and vacuolar pH is acidic ranging between 5 to 7.
  • The thylakoid lumen is more fluctuating which varies during light / dark cycles and is highly acidic.
  • The mitochondrial compartment and chloroplast maintains a basic conditions of about pH 8 for optimization of biochemical reactions occurring in these two particular compartments.

(Via: https://www.frontiersin.org/articles/10.3389/fpls.2017.02079/full#:~:text=Plastid%20stromal%20pH%20could%20only,cytosolic%20pH%20(around%207.3).

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