Cool temperature-induced changes in metabolism related to cellulose synthesis in cotton fibers

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Title: Cool temperature-induced changes in metabolism related to cellulose synthesis in cotton fibers
Author: Martin, Laual Kirt
Abstract: Fiber secondary wall thickening associated with cellulose synthesis in cotton (Gossypium hirsutum L . ) is greatly hindered under the cool night temperatures that occur during the growing season on the Southem High Plains of West Texas . Fibers on cultured cotton ovules exposed to a 34 /15°C temperature cycle during secondary wall synthesis were used as an experimental system to investigate the biochemical causes of this hindrance . Pool sizes of the metabolites related to cellulose synthesis were measured at cool temperature (15°C ) and at the optimum temperature for fiber cellulose synthesis (34°C ) in the fibers of cultured ovules from seven cultivars . Glucose 6 -phosphate levels increased during the 15°C part of the temperature cycle , with 40 - 70 % increases observed in all cultivars compared to 34°C . Partially cooltolerant cultivars (such as Paymaster HS2 (X ) ) demonstrated the ability to increase glucose 6 -phosphate levels greatly at 15°C on the first day of exposure to cycling temperature ; however , more cool -sensitive cultivars (such as Acala SJ -1 ) did not demonstrate this ability until 6 days after the cycling temperature commenced . Fmctose 6 -phosphate levels at 15°C within the fiber gradually increased above that at 34°C during the 6 days of cycling . UDP -Glucose levels decreased or only slightly increased at 15°C during the 6 days of cycling , although glucose 6 -phosphate levels increased dramatically . Therefore , a possible enzymic restriction at cool temperatures may occur subsequent to glucose 6 -phosphate in the cellulose synthesis pathway . Pulse /chase studies supported the hypothesis of an enzymic restriction subsequent to glucose 6 -phosphate , with partially cool -tolerant Paymaster HS200 showing less restriction than more cool -sensitive Acala SJ -1 .
URI: http : / /hdl .handle .net /2346 /10848
Date: 1999-05

Citation

Martin, Laual Kirt Cool temperature-induced changes in metabolism related to cellulose synthesis in cotton fibers. Doctoral dissertation, Texas Tech University. Available electronically from http : / /hdl .handle .net /2346 /10848 .

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