Polynucleotides and polypeptides involved in plant fiber development and methods of using same

Isolated polynucleotides are provided. Each of the isolated polynucleotides comprise a nucleic acid sequence encoding a polypeptide having an amino acid sequence at least 80% homologous to SEQ ID NOs:130-258 and 536-791， wherein the polypeptide is capable of regulating cotton fiber development. Also provided are methods of using such polynucleotides for improving fiber quality and/or yield of a fiber producing plant， as well as methods of using such polynucleotides for producing plants having increased biomass/vigor/yield.