单词	grana
释义	grana /ˈɡrɑːnə / /ˈɡreɪnə/ plural noun (singular granum) Botany The stacks of thylakoids embedded in the stroma of a chloroplast.Chloroplast envelopes, stacked grana and unstacked stroma thylakoids were well-defined.... The chloroplasts with large grana stacks were seen in 50% of cases but none of the parameters significantly explained the occurrence. The VPC chloroplasts possessed well-developed thylakoids with grana. Origin Late 19th century: plural of Latin granum 'grain'.
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