NOVELTY - Isolated nucleic acid molecule comprising a nucleic acid sequence that: (a) hybridizes to sequence of SEQ ID NOs: 1, 7, 9, 11, 13, 31, 33, 37, 39, 41, 43, 53, 55, 59, 61, 65, 75, 81, 83, 89, 99, 101, 107 or 109; (b) comprises sequence of SEQ ID NOs of (a); (c) exhibits at least 85% sequence identity to sequence of SEQ ID NOs of (a); (d) encodes a polypeptide at least 85% identical to polypeptide sequence of SEQ ID NOs: 2, 8, 10, 12, 14, 32, 34, 38, 40, 42, 44, 54, 56, 60, 62, 66, 76, 82, 84, 90, 100, 102, 108 or 110; or (e) comprises the full complement of (a)-(d), is new.    USE - The isolated nucleic acid molecule is useful in a DNA construct, which is useful in a transgenic plant (forage plant, biofuel crop (switchgrass (Panicum virgatum) (preferred), giant reed (Arundo donax), reed canarygrass Phalaris arundinacea), Miscanthus giganteus, Miscanthus sp., sericea lespedeza (Lespedeza cuneata), corn, sugarcane, sorghum, millet, ryegrass (Lolium multiflorum), timothy, Kochia (Kochia scoparia), soybean, alfalfa, clover, sunn hemp, kenaf, Bahiagrass, Bermuda grass, dallisgrass, pangola grass, big bluestem, Indian grass, fescue (Festuca sp.), Eremochloa ophiuroides (centipede grass), Dactylis sp., Brachypodium distachyon, smooth bromegrass, orchardgrass, Kentucky bluegrass, poplar, rice, cotton, Salvia miltiorrhiza (red sage), apple, Vitis vinifera (common grape), Ricinus communis (castor oil plant), Humulus lupulus (hops), Dahlia, Dendrobium (orchid), Brassica rapa (mustard), kudzu (Pueraria lobata) or wheat) or cereal crop), or transgenic plant cell, where the transgenic plant is useful for producing biomass or feedstock for biofuel production; and for modifying the lignin content in a plant (all claimed).    ADVANTAGE - The isolated nucleic acid molecule provides the transgenic plants having improved or enhance biofuel feedstock with reduced lignin content in their cell walls (i.e. reduced cell wall-bound coumaric acid to ferulic acid ratio), decreased height and increased tillers.    DETAILED DESCRIPTION - Isolated nucleic acid molecule comprising a nucleic acid sequence that e.g.: (a) hybridizes to sequence of SEQ ID NOs: 1, 7, 9, 11, 13, 31, 33, 37, 39, 41, 43, 53, 55, 59, 61, 65, 75, 81, 83, 89, 99, 101, 107 or 109 (comprising any one of fully defined sequences of 633-1210 nucleotides as given in the specification); (b) comprises sequence of SEQ ID NOs of (a); (c) exhibits at least 85% sequence identity to sequence of SEQ ID NOs of (a); (d) encodes a polypeptide at least 85% identical to polypeptide sequence of SEQ ID NOs: 2, 8, 10, 12, 14, 32, 34, 38, 40, 42, 44, 54, 56, 60, 62, 66, 76, 82, 84, 90, 100, 102, 108 or 110 (comprising any one of fully defined sequences of 210-292 amino acids as given in the specification); or (e) comprises the full complement of (a)-(d), is new. INDEPENDENT CLAIMS are also included for:    (1) a DNA construct comprising the nucleic acid sequence, where the nucleic acid sequence is operably linked to a heterologous promoter sequence, and expression of the nucleic acid sequence in a transgenic plant reduces the lignin content of the plant;    (2) a transgenic plant or plant part comprising the DNA construct;    (3) a transgenic plant cell comprising the DNA construct; and    (4) modifying the lignin content of a plant, comprising down-regulating or over-expressing a MYB4 transcription factor (that functions to suppress lignin biosynthesis) in the plant.