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- W2010548626 abstract "Accumulation of polyols in insects is well known as a cold-hardening response related to overwintering or to protection against cold shock. The silverleaf whitefly (Bemisia argentifolii, Bellows and Perring) is a major insect pest in tropical and subtropical regions where heat stress and desiccation pose formidable threats to survival. We found that sorbitol levels increased ten-fold when whiteflies were exposed to elevated temperatures. Sorbitol levels rose from 0.16nmolwhitefly(-1) at 25 degrees C to 1.59nmolwhitefly(-1) at 42 degrees C. Sorbitol levels fluctuated diurnally under glasshouse and field conditions increasing ten-fold from morning to early afternoon. Feeding experiments on artificial diets showed that both temperature and dietary sucrose concentration were key factors influencing sorbitol accumulation. Cell free extracts prepared from adult whiteflies catalyzed NADPH-dependent fructose reduction, but were unable to reduce glucose with either NADPH or NADH. Radiotracer experiments with labeled glucose and fructose showed that fructose was the immediate precursor of sorbitol. Thus, sorbitol synthesis in the whitefly is apparently unconventional, involving conversion of fructose by a novel NADPH-dependent ketose reductase. We propose that sorbitol accumulation is a mechanism for thermoprotection and osmoregulation in the silverleaf whitefly, allowing the insect to thrive in environments conducive to thermal and osmotic stress." @default.
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- W2010548626 date "1998-07-01" @default.
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- W2010548626 title "A thermoprotective role for sorbitol in the silverleaf whitefly, Bemisia argentifolii" @default.
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- W2010548626 doi "https://doi.org/10.1016/s0022-1910(98)00035-3" @default.
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