SSR Unigene Annotation Possible correlation Reference Associated with cell-wall (Cernadas et elongation al. 2008) ID ES7 isotig003 Pectinesterase 64 ES16 isotig006 Probable LRR Cellulose overproduction and (Ghosh et al. 26 receptor-like superior quality fiber 2013) serine/threonine-protein formation kinase ES62 isotig015 Heparanase-2, putative 51 ES90 ES95 isotig020 DUF26 domain-containing 28 protein 1 precursor isotig021 40S ribosomal protein S5 Xylan synthesis (Jensen et al. 2011) 20 ES106 isotig023 PGIP 06 Cell wall remodeling and (Nguema-Ona reorganization of the et al. 2013) cellulose-xyloglucan network ES149 isotig028 Glucomannan Hemicelluloses (xylan and (Zhong and 98 4-beta-mannosyltransferas glucomannan) Ye 2015) Putative expansin-B2 Fiber development (Li et al. 2015) GASA-like protein May promote fiber elongation (Chen et al. through modulating 2012) e9 ES171 isotig031 28 ES181 isotig031 77 H2O2 levels ES233 isotig036 Glycosyltransferase (Li et al. 2011; 90 Qin et al. 2013) ES261 isotig038 Importin alpha 84 ES347 ES576 ES605 isotig053 Adenine 32 phosphoribosyltransferase isotig079 Glycosyl hydrolase family 10 9 isotig081 Pectinesterase-2 precursor 37 ES611 isotig081 94 Polygalacturonase Formerly known as cellulase, break down the cellulose molecule into monosaccharides ("simple sugars") such as beta-glucose, or shorter polysaccharides and oligosaccharides. (Varnai et al. Associated with cell-wall (Cernadas et elongation al. 2008) A significant carbohydrate (Jones et al. component of the pectin 1972) 2014) network ES661 isotig085 Glucan 60 endo-1,3-beta-glucosidase Cell wall thickness (Schlosser et al. 2008) 13 ES687 ES760 isotig087 Serine 98 hydroxymethyltransferase isotig095 Probable pectate lyase 22 41 ES766 isotig096 Callose synthase Involved in plant cell wall (Tamaru and degradation Doi 2001) Cell wall components (Pirselova and 13 Matusikova 2013) ES772 ES837 ES906 isotig096 Thaumatin-like Cell wall development (Munis et al. 46 protein-like isotig103 DUF26 domain-containing 14 protein 2 precursor isotig108 Lignin-forming anionic Catalyze the formation of the (Lagrimini et 84 peroxidase-like lignin polymer and form rigid al. 1987) 2010) Xylan synthesis (Jensen et al. 2011) cross-links between lignin, cellulose, and extensin in the secondary plant cell wall ES1047 isotig128 Hypothetical protein 45 ES1215 isotig148 Hypothetical protein 88 ES1305 isotig164 Hypothetical protein 36 ES1308 isotig164 Hypothetical protein 84 ES1328 isotig167 Hypothetical protein 58 ES1431 isotig068 14-3-3f protein 46 ES1509 isotig104 Beta-expansin 3 precursor Fiber development (Li et al. 2015) 35 ES1519 isotig119 Hypothetical protein 55 ES1628 HRMYN Probable pectinesterase Associated with cell-wall (Cernadas et UX02II8 68-like elongation al. 2008) GDSL esterase/lipase Cell wall-associated (Chepyshko et HX ES1805 HRX1M BH01ED al. 2012) SQX ES1851 HRX1M Cysteine-rich repeat Related to the DUF domain (Jensen et al. BH02FP secretory protein 3 protein 2011) 58M ES2055 HRX1M Serine carboxypeptidase BH02I8 family protein XNE ES2200 HS0W81 Gibberellin-regulated Important plant hormone in (Withanage et S01AST protein 3 precursor regulating fiber development al. 2015) Polygalacturonase A significant carbohydrate (Jones et al. S01BP7 component of the pectin 1972) G7 network F4 ES2283 HS0W81 Cernadas RA, Camillo LR, Benedetti CE, (2008) Transcriptional analysis of the sweet orange interaction with the citrus canker pathogens Xanthomonas axonopodis pv. citri and Xanthomonas axonopodis pv. aurantifolii. Mol Plant Pathol 9:609-631 Chen XD, Guo WZ, Liu BL, Zhang YM, Song XL, Cheng Y, Zhang LL, Zhang TZ (2012) Molecular mechanisms of fiber differential development between G. barbadense and G. hirsutum revealed by genetical genomics. 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Plant J 66:387-400 Jones TM, Anderson AJ, Albersheim P (1972) Hostpathogen interactions IV, studies on the polysaccharide-degrading enzymes secreted by Fusarium oxysporum f. sp. lycopersici, Physiol Plant Pathol 2:153-166 Lagrimini LM, Burkhart W, Moyer M, Rothstwin S (1987) Molecular cloning of complementary DNA encoding the lignin-forming peroxidase from tobacco: Molecular analysis and tissue-specific expression. P Natl Acad Sci USA 84:7542-7546 Li QZ, Min DY, Wang JPY, Peszlen I, Horvath L, Horvath B, Nishimura Y, Jameel H, Chang HM, Chiang VL (2011) Down-regulation of glycosyltransferase 8D genes in Populus trichocarpa caused reduced mechanical strength and xylan content in wood. Tree Physiol 31:226-236 Li Y, Tu LL, Ye ZX, Wang MJ, Gao WH, Zhang, XL (2015) A cotton fiber-preferential promoter, PGbEXPA2, is regulated by GA and ABA in Arabidopsis. Plant Cell Rep 34:1539-1549 Munis MFH, Tu LL, Deng FL, Tan JF, Xu L, Xu SC, Long L, Zhang, XL (2010) A thaumatin-like protein gene involved in cotton fiber secondary cell wall development enhances resistance against Verticillium dahliae and other stresses in transgenic tobacco. Biochem Bioph Res Co 393:38-44 Nguema-Ona E, Moore JP, Fagerstrom AD, Fangel JU, Willats WGT, Hugo A, Vivier MA (2013) Overexpression of the grapevine PGIP1 in tobacco results in compositional changes in the leaf arabinoxyloglucan network in the absence of fungal infection. BMC Plant Biol 13:46 Pirselova B and Matusikova I (2013) Callose: the plant cell wall polysaccharide with multiple biological functions. Acta Physiol Plant 35:635-644 Qin LX, Rao Y, Li L, Huang JF, Xu WL, Li XB (2013) Cotton GalT1 encoding a putative glycosyltransferase is involved in regulation of cell wall pectin biosynthesis during plant development. PloS one 8: e59115 Schlosser J, Olsson N, Weis M, Reid K, Peng F, Lund S, Bowen P (2008) Cellular expansion and gene expression in the developing grape (Vitis vinifera L.). Protoplasma 232:255-265 Tamaru Y and Doi RH (2001) Pectate lyase A, an enzymatic subunit of the Clostridium cellulovorans cellulosome. P Natl Acad Sci USA 98:4125-4129 Varnai A, Makela MR, Djajadi DT, Rahikainen J, Hatakka A, Viikari L (2014) Carbohydrate-binding modules of fungal cellulases: occurrence in nature, function, and relevance in industrial biomass conversion. Adv Appl Microbiol 88:103-165 Withanage SP, Hossain MA, Kumar MS, Roslan HAB, Abdullah MP, Napis SB, Ab Shukor NA (2015) Overexpression of Arabidopsis thaliana gibberellic acid 20 oxidase (AtGA20ox) gene enhance the vegetative growth and fiber quality in kenaf (Hibiscus cannabinus L.) plants. Breeding Sci 65:177-191 Zhong R and Ye ZH (2015) Secondary cell walls: biosynthesis, patterned deposition and transcriptional regulation. 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