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. 2018 Jan 17;69(5):997–1009. doi: 10.1093/jxb/erx459

Fig. 6.

Fig. 6.

Working model for the role of MYB25-like homoeologs in lint and fuzz development. Initiation and development of lint are determined by the total expression level of both homoeologs of MYB25-like at ~0 dpa, while initiation and development of fuzz are mainly governed by the expression level of MYB25-like_Dt at ~3 dpa, although MYB25-like_At may have the ability to compensate for lack of MYB25-like_Dt at ~3 dpa. If the expression level of MYB25-like is below the threshold level 2 at ~0 dpa, no lint fibre will initiate; otherwise lint fibres develop and their amount is positively correlated with the total expression level of MYB25-like. If the expression level of MYB25-like_Dt is lower than the threshold level 1 at ~3 dpa, cotton seeds will be fuzzless; otherwise fuzz fibres develop and their amount is positively correlated with the expression level of MYB25-like_Dt. When the total expression levels of MYB25-like at ~0 dpa and of MYB25-like_Dt at ~3 dpa are lower than the threshold level 2 and 1, respectively, cotton seeds will be fibreless (e.g. Xu142fl). When the total expression level of MYB25-like at ~0 dpa is higher than the threshold level 2 but the expression level of MYB25-like_Dt at ~3 dpa is below the threshold level 1, cotton seeds will be fuzzless (e.g. T586). No mutant with lintless and fuzzy seed has ever been reported; that is probably because cottons with an expression level of MYB25-like_Dt at ~3 dpa high enough for fuzz development usually have a high enough total expression level of MYB25-like_Dt and MYB25-like_At at ~0 dpa for lint development.