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Research articles

ScienceAsia 41(2015): 180-186 |doi: 10.2306/scienceasia1513-1874.2015.41.180

Cellulose synthesis in coloured cotton

Sen-He Qiana,b, Liang Honga, Miao Xua, Yong-Ping Caia, Yi Lina,*, Jun-Shan Gaoa

ABSTRACT:     Using green, brown, and white cotton as materials, the contents of cellulose, carbohydrates, and flavonoid compounds as well as enzyme activities related to cellulose synthesis were investigated at various stages of fibre development to elucidate the characteristics of cellulose synthesis. The results showed that cellulose contents in all three cotton fibres showed `S-shaped curve' changing patterns. According to a logistic growth model, the lower maximum accumulative rate of cellulose in the coloured cotton indicated less cellulose accumulation during fibre development. No significant differences in the carbohydrate content and carbohydrate transformation rates were observed between coloured and white cotton fibre. However, the flavonoid content in coloured cotton fibres was significantly higher than white cotton, and the flavonoid biosynthesis in coloured cotton fibres consumed a large amount of carbohydrates which should normally be used for cellulose synthesis. Low indoleacetic acid oxidase and peroxidase activities lowered cellulose accumulation in coloured cotton fibres. High activities of sucrose synthetase and β-1,3-glucanase in coloured cotton fibres may promote efficient utilization of carbohydrates. However, carbohydrate metabolism in the coloured cotton fibre should not only be responsible for cellulose biosynthesis but also for flavonoid biosynthesis.

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a College of Life Science, Anhui Agricultural University, Hefei 230036 China
b Dept. of Biochemistry, Anhui Polytechnic University, Wuhu 241000 China

* Corresponding author, E-mail: linyi3000@163.com

Received 16 Apr 2014, Accepted 9 Jul 2015