Aquaporin-deficient mutant of Synechocystis is sensitive to salt and high-light stress

•The AqpZ-null Synechocystis was used to study the responses to salt and light stress.•The AqpZ-deficient cells cannot regulate the cytoplasmic volume under salt stress.•PSII and PSI of the mutant are more sensitive to NaCl and to high light.•AqpZ participates in regulation of the PSI and PSII under...

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