TECHNOLOGY FOCUS - BIOLOGY - Preparation: No preparation method is given. Preferred Components: The transgenic plant or transgenic plant cell comprises the nicotinamide adenine dinucleotide-malic enzyme photosynthetic pathway. The transgenic plant or transgenic plant cell further comprises at least one transgene that increase carbon flow for the production of polyhydroxyalkanoates. The transgene increase carbon flow through the Calvin cycle in photosynthesis. The bifunctional enzyme is Ralstonia eutropha-HI6 (Accession number AAA69974), Synechococcus elongatus-PCC 7942 (Accession numbers D83512 (SEQ ID NO: 2 (comprising fully defined sequence of 276 amino acid sequences as given in the specification)) and CP000100 (SEQ ID NO: 1 (comprising fully defined sequence of 265 amino acid sequences as given in the specification)), Synechococcus-WH 7805 (Accession number ZP01124026), Butyrivibrio crossotus-DSM 2876 (Accession number EFF67670), Rothia mucilaginosa-DY-18 (Accession number YP 003363264), Thiobacillus denitrificans-ATCC 25259 (Accession number AAZ98530), Methylacidiphilum infernorum-V4 (Accession number ACD83413), Nitrosomonas europaea-ATCC 19718 (Accession number CAD84432), Vibrio vulnificus-CMCP6 (Accession number AA009802) or Methanohalophilus mahii-DSM 5219 (Accession number YP003542799). The plant or plant cell transformed to produce the transgenic plant or transgenic plant cell is switchgrass (preferred), Miscanthus, Sorghum, sugarcane, energy cane, giant reed, millets, Napier grass, other forage grasses or turf grasses. The cultivar of switchgrass is alamo, blackwell, kanlow, nebraska 28, pathfinder, cave-in-rock, shelter or trailblazer. The plant transformed to produce the transgenic plant is a 4C plant. The transgenic plant produces at least 4-8% dry weight of polyhydroxyalkanoate. The feedstock is obtained from the transgenic plant. The embryogenic callus culture is derived from the plant. The plant is the Alamo cultivar of switchgrass. The embryogenic callus culture is derived from a transgenic 4C plant. EXAMPLE - No suitable example given.