Agriculture and Plant Science: fatty acid composition and cold hardiness of pecan cultivars.Low temperature is the most important factor limiting the distribution of plants. Only hardy plants can survive low temperature. During acclimation acclimation /ac·cli·ma·tion/ (ak?li-ma´shun) the process of becoming accustomed to a new environment. ac·cli·ma·tion n. 1. and deacclimation plants undergo a series of metabolic changes that lead to cold hardiness or loss of hardiness. One of these changes is the accumulation of certain lipids. This research was conducted to compare hardiness among three pecan cultivars: 'Desirable,' 'Jackson,' and 'Owens' growing under Mississippi condition and to determine the relationship between fatty acid levels and cold hardiness of pecan shoots. Differential thermal analysis Differential thermal analysis (or DTA) is a thermoanalytic technique, similar to differential scanning calorimetry. In this technique, the heat flow to the sample and reference remains constant, as opposed to temperature. (DTA DTA Drive Through Appraisal DTA Data (File Name Extension) DTA Differential Thermal Analysis DTA Department of Transitional Assistance (Massachusetts) DTA Development Trusts Association ), electrical conductivity, and tetrazolium tests were used to determine cold hardiness. Pecan stems were collected from September to March in 2002 and 2003 to determine cold acclimation and deacclimation. Fatty acid composition of pecan stems during this time period was determined by gas chromatography. DTA indicated that pecan stems acclimated in October and deacclimated in March. Total percentage of fatty acid significantly increased during cold acclimation and there was a shift in the fatty acid composition to more unsaturated fatty acids unsaturated fatty acids, n.pl the double- or triple-bonded fatty acids contained primarily in vegetable oils and fish, which remain liquid at room temperature; linked to a reduction in the risk of developing heart disease. . The percentage of linoleic and linolenic fatty acids increased, while the percentage of palmitic and stearic fatty acids decreased. The correlation between unsaturated fatty acids and cold hardiness suggests that unsaturated fatty acid unsaturated fatty acid n. A fatty acid, such as oleic acid, whose carbon chain possesses one or more double or triple bonds and hence can incorporate additional hydrogen atoms. may play a role in membrane fluidity. Sameera Bafeel* and F.B. Matta, Mississippi State University Mississippi State University, at Mississippi State, near Starkville; land-grant and state supported; coeducational; chartered 1878 as an agricultural and mechanical college, opened 1880. From 1932 to 1958 it was known as Mississippi State College. , Mississippi State, MS 39762 |
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