NOVELTY - New Sorghum, Miscanthus, Panicum or sugarcane plant cell (C1) comprises: exogenous nucleic acid having regulatory region operably linked to nucleotide sequence encoding polypeptide, where Hidden Markov Model (HMM) bit score of amino acid sequence of polypeptide is greater than 65, and HMM based on amino acid sequences is depicted in one of Figures 1, 2, 4, 6, 7, 8, or 9 as given in the specification, where plant produced from cell has difference in biomass composition as compared to corresponding composition of control plant that does not comprise nucleic acid.    USE - For producing Sorghum, Miscanthus, Panicum, or sugarcane plant; for producing and processing biomass from Sorghum, Miscanthus, Panicum, or sugarcane plant such as to produce fuel; for altering biomass composition in a Sorghum, Miscanthus, Panicum, or sugarcane plant; for modulating biomass composition of Sorghum, Miscanthus, Panicum, or sugarcane plant; and for producing forage product (all claimed).    ADVANTAGE - The difference in biomass composition in plant obtained by using cell (C1), (C1a) (C1b) and (C1c) comprises increase in total sugar content, increase in sugar availability from cell wall, increase in total glucose released from retreatment, increase in total sugar content in juice, increased juice brix, increase in yield of juice, increase in sucrose purity in juice, and/or increase in sugar yield in juice from plant. The difference in biomass composition in plant obtained by using cell (C1), or (C1a) is ( greater than or equal to 1.5 fold, preferably greater than or equal to 2 fold, especially greater than or equal to 2.5 fold) increase in glucose from cell well as compared to that of control plant that does not comprise nucleic acid; and difference in biomass composition in plant is ( greater than or equal to 3 fold, preferably greater than or equal to 4 fold, especially greater than or equal to 6 fold) increase in sugar yield as compared to that of control plant that does not comprise nucleic acid. Further difference in biomass composition in plant obtained by using cell (C1), or (C1a) is increase in conversion efficiency as compared to that of control plant that does not comprise nucleic acid; and difference in biomass composition in plant obtained by using cell (C1), (C1a), (C1b) or (C1c) is selected from decrease in ash content and increase in total glucan content. The Sorghum plant containing exogenous biomass composition-modulating nucleic acid, shows increase in total sugar content in juice, increased juice brix, and/or increase in yield of sugar from juice from plant that is statistically significantly greater than that of corresponding control plant that lacks biomass composition-modulating nucleic acid; where Sorghum plant has sucrose content that is statistically significantly greater than sucrose content of corresponding control plant that lacks the biomass composition-modulating nucleic acid. The Sorghum, Panicum, Miscanthus, or sugarcane plant containing exogenous biomass composition-modulating nucleic acid, has biomass composition that is statistically significantly different from biomass composition of corresponding control plant that lacks biomass composition-modulating nucleic acid, in which biomass has increase in total sugar content, increase in sugar availability from cell wall, increase in total glucose released from pretreatment, increase in total sugar content in juice, increased juice brix, increase in yield of juice, increase in sucrose purity in juice, and/or increase in sugar yield in juice from the plant. By employing method (M3a) total amount of sugar extracted from the biomass is statistically significantly increased compared to biomass from corresponding control plants to which a gibberellin has not been applied. The biomass obtained in method (M3b) has increased yield of fuel compared to biomass from corresponding control plants to which gibberellin has not been applied. In methods (M3c) and (M3d) biomass produced has decreased ash content compared to biomass from corresponding control plants to which gibberellin has not been applied. The biomass produced by the method (M3f) has decreased ash content compared to biomass from corresponding control plants that lack exogenous nucleic acid.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) new plant cells (C1a), (C1b), (C1c), (C1d), (C1e), (C1f), (C1g), (C1h) and (C1i); (2) a transgenic Sorghum, Miscanthus, Panicum, or sugarcane plant (P1) comprising the plant cell (C1) or (C1a); (3) method (M1), (M1a) and (M1b) for producing a Sorghum, Miscanthus, Panicum, or sugarcane plant; (4) a transgenic plant (P2) comprising the plant cell (C1b), (C1c), (C1d), or (C1e); (5) method (M2) for producing biomass, involving: (a) growing several plants (P1) or (P2); and (b) harvesting biomass from the plants; (6) method (M2a) for producing biomass, involving: (a1) applying a gibberellin to a population of plants; and (b1) harvesting cellulosic biomass from the plants; (7) method (M3), (M3a), (M3b), (M3c), (M3d), (M3e), and (M3f) for processing biomass; (8) method (M4) for altering biomass composition in a Sorghum, Miscanthus, Panicum, or sugarcane plant; (9) methods (M5) and (M5a) for modulating biomass composition of a plant; and (10) method (M6) for producing a forage product involving: (a8) growing several of the plant (P1) or (P2); (b8) harvesting biomass from the plants; (c8) chopping or cutting the harvested biomass; and (d8) ensiling the biomass from step (c8) to produce the forage product.