TECHNOLOGY FOCUS - BIOTECHNOLOGY - Preferred Polynucleotide: The polynucleotide encoding a fusion protein including the modified oleosin fused to a protein of interest. The polynucleotide is operably linked to a photosynthetic cell preferred promoter polynucleotide. Preferred Cell: The host cell is genetically modified to express a polynucleotide, or an expression product of the polynucleotide. The host cell is genetically modified to express a triacylglycerol (TAG) synthesizing enzyme. The host cell is a plant cell. The host cell is processed into an oil fraction. The photosynthetic cell is also genetically modified to express a triacylglycerol (TAG) synthesising enzyme. The photosynthetic cell is a plant cell. The plant cell is portion of a plant. Preferred Plant: The plant is genetically modified to express TAG synthesising enzyme. The plant accumulates more total lipid or oil in its non-photosynthetic tissues/organs than does a control plant. The plant is also genetically modified to express a TAG synthesising enzyme. Preferred Component: The modified oleosin includes at least one cysteine in the N-terminal hydrophilic region, and at least one cysteine in the C-terminal hydrophilic region. The oil component additionally comprises a fusion protein that includes an oleosin fused to a protein of interest. The oleosin in the fusion protein includes an artificially introduced cysteine in its oleosin portion. Preferred Method: The method (M1) involves combining the above-cited components (i), (ii) and (iii) within a host cell. The modified oleosins are expressed in the host cell. The host cell forms portion of an organism. The organism is a plant. The method (M1) involves purifying the oil bodies from the host cell or organism. The components of (i), (ii) and (iii) are combined in vitro. The expression of the modified oleosin causes the increased rate of carbon dioxide assimilation. The expression of the modified oleosin reduces or prevents lipid recycling in the photosynthetic cell. The reduced or prevented lipid recycling causes the increased carbon dioxide assimilation. The cysteines are distributed substantially evenly between the N-terminal and C-terminal hydrophilic regions of the oleosin. The increased rate of carbon dioxide assimilation produces a photosynthetic cell with at least one of (a) an increased rate of photosynthesis, (b) increased water use efficiency, (c) an increased growth rate (d) increased chloroplast carbon dioxide concentration, (e) a decreased rate of photorespiration, (f) increased high temperature tolerance, (g) increased high oxygen concentration tolerance, (h) increased nitrogen use efficiency, and (i) decreased loss of fixed carbon. The increased rate of carbon dioxide assimilation the plant has at least one of (a) an increased rate of photosynthesis, (b) increased water use efficiency, (c) an increased growth rate, (d) increased biomass, (e) delayed flowering, (f) increased chloroplast carbon dioxide concentration, (g) a decreased rate of photorespiration, (h) increased seed, fruit or storage organ yield, (i) increased drought tolerance, (j) increased high temperature tolerance, (k) increased high oxygen concentration tolerance, (l) increased nitrogen use efficiency, and (m) decreased loss of fixed carbon. The method (M4) involves processing the non-photosynthetic tissue/organ of the plant into an animal feedstock, processing the non-photosynthetic tissue/organ of the plant into a biofuel feedstock and extracting oil from the non-photosynthetic tissue/organ of the plant. EXAMPLE - No suitable example given.