Height and radial growth In growth respiration, glucose and other carbohydrates convert to growing cambial tissues (growing meristems) to form new tissues composed of carbohydrates, cellulose, lignin, proteins, and fats. In needles of Douglas fir (Pseudotsuga menziesii), for example, the carbohydrate content is 60 % and lignin content 15 %, and in stems 65 % and 30 %,
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