Figure 11.

Model for Recruitment to the PG under Light Stress and Its Influence on Surface Area/Volume.

(A) The three-dimensional cut-away representation of a PG illustrates the PG periphery composed of amphiphilic glycerolipids surrounding a nonpolar interior. The differential ultrastructures of the PG in response to 5× light stress in the wild type (wt) and k1 k3 genotypes are depicted.

(B) Recruitment of JA biosynthetic enzymes and photosystem metabolites to the PG occur simultaneous with increasing number of PGs in k1 k3 chloroplasts. Because the PPH protein has never been identified elsewhere in the plastid, we propose that it is synthesized de novo in response to the increased chlorophyll turnover of k1 k3 light-stressed leaves.