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Annexins are assumed to be involved in regulating cotton fiber elongation, but direct evidence remains to be presented. Here we cloned six Annexin genes ( AnxGb ) abundantly expressed in fiber from sea-island cotton ( G. barbadense ). qRT-PCR results indicated that all six  G. barbadense  annexin genes were expressed in elongating cotton fibers, while only the expression of  AnxGb6  was cotton fiber-specific. Yeast two hybridization and BiFC analysis revealed that AnxGb6 homodimer interacted with a cotton fiber specific actin GbAct1. Ectopic-expressed  AnxGb6  in  Arabidopsis  enhanced its root elongation without increasing the root cell number. Ectopic  AnxGb6  expression resulted in more F-actin accumulation in the basal part of the root cell elongation zone. Analysis of  AnxGb6  expression in three cotton genotypes with different fiber length confirmed that  AnxGb6  expression was correlated to cotton fiber length, especially fiber elongation rate. Our results demonstrated that AnxGb6 was important for fiber elongation by potentially providing a domain for F-actin organization.

A Cotton Annexin Protein AnxGb6 Regulates Fiber Elongation through Its Interaction with Actin 1