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United States Department of Agriculture

Agricultural Research Service

Title: The Pattern and Magnitude of Thermal Stress on Metabolism in Emerging Cotton Seedlings

Authors
item Mahan, James
item Mahan, James
item Anderson, Ronald - TEXAS TECH UNIVERSITY
item Burke, John
item Upchurch, Dan
item Martin, Clyde - TEXAS TECH UNIVERSITY

Submitted to: Fifth International Conference of Desert Development
Publication Type: Proceedings
Publication Acceptance Date: August 12, 1996
Publication Date: N/A

Interpretive Summary: Soil temperature at the time of planting affects the rate of seedling emergence. On the Southern High Plains, cotton is often planted into soils that are too cool for optimal plant performance. In this experiment the effect of temperature on the seedling enzyme malate synthase was used to define the temperatures for optimal seedling metabolism and growth. The effect of various management treatments on the soil temperatures as they compare to the optimal temperatures for the plant were determined. It was found that specific combinations of row spacing and irrigation provided optimal temperatures at different planting dates. This information will be useful to researchers and producers in determining the optimal conditions for cotton planting.

Technical Abstract: The thermal environment of seedlings changes significantly over diurnal and seasonal time scales. Early-season thermal stress delays emergence in cotton and has subsequent effects on yield and fiber quality. In this study, a biochemical analysis of the thermal dependence of metabolism in preemergent seedlings identified sources of thermal limitations that were used as the basis for computer modeling of the thermal dependence of metabolism. The optimal thermal range for seedling metabolism was used in the analysis of the patterns and magnitude of thermal stresses. Data visualization techniques were used to qualitatively analyze the thermal environment and the predicted thermal stresses on the plant. Alterations in the thermal dependence of a seedling enzyme were modeled and demonstrate the utility of such an approach to the alleviation of thermal stress. Several management scenarios involving irrigation frequency and row spacing were shown to alter the pattern of thermal stresses.

Last Modified: 10/22/2014
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