棉 花 学 报      Cotton Science      2009，21(4)：319-323

Dynamics of Sugar and Cellulose Synthesis in Bolls of Island Cotton ( Gossypium barbadense L.)
BIAN Ru-xin¹，LIU Ming^1*，FAN Jun-hua¹，CAO Juan¹，ZHANG Jian-hua^2*
(1.Institute of Plant Science and Technology，Tarim University，Alar, Xinjiang 843300，China；2.Dearpt ment of Biology, HongKong Baptist University，HongKong，China)

Abstract：Sugar contents and cellulose deposition were monitored in the bolls of two varieties Xinhai 21 and Xinhai 28(YX-193 and XH-28) of island cotton in South Xinjiang in 2006 and 2007. After anthesis, total sugars in boll shells, seeds and fiber kept increasing and reached their maximum level at 21- 28 days post anthesis (DPA). After that the sugar contents rapidly declined and reached the low level at the boll opening period. The cellulose was synthesized starting form 14 DPA and reached a peak at the boll opening stage. Soluble solids contents in fibers kept decreasing linearly during the boll development. Total soluble sugars, reducing sugars and their conversion rates showed an order as: fibers ＞ seeds ＞ boll shells, and were generally higher in YX-193 than in XH-28. The results indicate that sugar unloading and conversion capacities in bolls are related to fiber development and YX-193 has advantages over XH-28.
Key words：island cotton ( Gossypium barbadense L.)；boll development；sugar metabolism；reducing
sugars；cellulose synthesis        [Full Text, 2043KB]