Carbohydrate Accumulation in Relation to Heat Stress Tolerance in Two Creeping Bentgrass Cultivars
By Xiaozhong Liu, Bingru Huang. 2000
90 citations recorded by the source corpus.
Understanding physiological factors that may confer heat tolerance would facilitate breeding for improvement of summer turf quality. The objective of this study was to investigate whether carbohydrate availability contributes to changes in turf quality and root mortality during heat stress in two creeping bentgrass ( Agrostis stolonifera L. var. palustris (Huds.) Farw. (syn. A. palustris Huds.)) cultivars, 'L-93' and 'Penncross', that contrast in heat tolerance. Grasses were grown at 14-hour days and 11-hour nights of 22/16 °C (control) and 35/25 °C (heat stress) for 56 days in growth chambers. Turf quality decreased while root mortality increased under heat-stress conditions for both cultivars, but to a greater extent for 'Penncross' than 'L-93'. The concentrations of total nonstructural carbohydrate (TNC), fructans, starch, glucose, and sucrose in shoots (leaves and stems) and roots decreased at 35/25 °C. The reduction in carbohydrate concentrations of shoots was more pronounced than that of roots. Shoot glucose and sucrose concentrations were more sensitive to heat stress than other carbohydrates. 'L-93' maintained significantly higher carbohydrate concentrations, especially glucose and sucrose, than 'Penncross' at 35/25 °C. Results suggest that high carbohydrate availability, particularly glucose and sucrose, during heat stress was an important physiological trait associated with heat-stress tolerance in creeping bentgrass. (1968, 1976) reported a negative relationship between tempera- ture and total nonstructural carbohydrates (TNC) in shoots of several turfgrass species. Watschke et at. (1970) also reported that high temperature injury was related to reduction in sugar concen- tration in shoots of Kentucky bluegrass. In contrast, Duff and Beard (1974) reported that in creeping bentgrass, carbohydrate content increased with increasing temperatures. The effects of heat stress on carbohydrate status in cool-season grasses remains unclear. Furthermore, extremely limited information is available on the status of different fractions of carbohydrates in shoots and roots associated with heat tolerance of creeping bentgrass. Under- standing the influence of heat stress on carbohydrate metabolism in cool-season grasses and the differences among cultivars will provide better insight into mechanisms affecting plant tolerance to heat. Therefore, the following research was conducted to investigate the status of different carbohydrate fractions in shoots and roots in relation to heat tolerance in two creeping bentgrass cultivars, 'L-93' and 'Penncross', that contrast in heat tolerance (Huang et al., 1998a, 1998b).
Subfields: Ecology, Environmental Chemistry, Nature and Landscape Conservation
View Paper: https://www.semanticscholar.org/paper/178a7274a0fdb5d2e830207375c2bbd33f30dc7a
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Citations in the corpus
- Temperature stress and redox homeostasis in agricultural crops (2015, background): “According to studies, higher availability of carbohydrates such as glucose and sucrose during heat stress represents an important physiological trait associated with stress tolerance and acclimation (Liu and Huang, 2000).”
- Food crops face rising temperatures: An overview of responses, adaptive mechanisms, and approaches to improve heat tolerance (2016, background): “Electrolyte leakage is thus a measure of reduced cell membrane thermo-stability and reflects stress-induced changes (Liu & Huang, 2000; Xu, Li, Zhang, Wei, & Cui, 2006).”
- Research Advances in Mechanisms of Turfgrass Tolerance to Abiotic Stresses: From Physiology to Molecular Biology (2014, background): “Heat-tolerant cultivars of creeping bentgrass (‘L-93’, ‘Penn A-4’) were also found to exhibit higher activities of SOD and CAT compared to heat-sensitive cultivars (‘Penncross’ and ‘Putter’) (Liu and Huang, 2000a; Huang et al., 2001; Wang et al., 2003b).”
- Plant tolerance to high temperature in a changing environment: scientific fundamentals and production of heat stress-tolerant crops (2013, background): “Nevertheless, HSPs are of particular importance in thermotolerance reactions and act as molecular chaperones to prevent denaturation or aggregation of target proteins as well as facilitating protein refolding (Lohar and Peat, 1998; Ahuja et al., 2010; Scharf et al., 2011).”