Fig. 6

Expression of GhGRF genes in different tissues analyzed by real-time quantitative reverse transcription polymerase chain reaction (qRT-PCR). Twelve tissues, including roots, stems, leaves, cotyledon, hypocotyl petal, stamen, pistil, sepals, torus, ovules (0dpa) and fiber (6dpa), were collected from the continuing growing cotton plants. Relative gene expression levels are normalized to histone-3 gene (GhHIS3) values. Error bars indicate SD (n = 3). Statistically significant differences (“a” is different from “b” or “c”, α = 0.01 level) of expression values are indicated with different letters with analysis of variance in R (https://www.r-project.org/)