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Zhou Li, Yan Peng, and Bingru Huang

for activation of defense mechanisms in plants during early phases of stress responses ( Ray et al., 2012 ; Suzuki et al., 2012 ; Yu, 1994 ). Previous studies demonstrated that exogenous H 2 O 2 enhanced heat tolerance through improving cell

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Joohee Lee and Yeh-Jin Ahn

confer tolerances to not only heat, but also multiple abiotic stresses. In this study, we examined the expression and function of DcHsp17.7 under heavy metal (lead ion) and metalloid (arsenate) stresses. Heavy metal and metalloid contamination poses a

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Meghyn Meeks, Ambika Chandra, and Ben G. Wherley

greater tolerances to heat, drought, and shade, but are generally not well adapted to southern environments ( Brilman, 2009 ; Hall, 1996 ; Morris, 2010 ). Genes conferring heat and drought tolerances have been introgressed from texas bluegrass ( Poa

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Peter Nveawiah-Yoho, Jing Zhou, Marsha Palmer, Roger Sauve, Suping Zhou, Kevin J. Howe, Tara Fish, and Theodore W. Thannhauser

synthesis elongation factor EF-Tu in heat tolerance in plants J. Bot. 835– 836 Goldgur, Y. Rom, S. Ghirlando, R. Shkolnik, D. Shadrin, N. Konrad, Z. Bar-Zvi, D. 2006 Desiccation and zinc binding induce transition of tomato abscisic acid stress ripening 1, a

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Travis C. Teuton, John C. Sorochan, Christopher L. Main, and Thomas C. Mueller

bluegrasses ( P. arachnifera Torr. × P. pratensis L.) are interspecific hybrids of texas bluegrass ( P. arachnifera Torr.) and traditional kentucky bluegrass. These hybrid bluegrass cultivars were bred for having the heat and drought tolerance of texas

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K.M. Rainey and P.D. Griffiths

Yield components of 24 common bean (Phaseolus vulgaris L.) genotypes were evaluated following exposure during reproductive development to four greenhouse day/night temperature treatments (24 °C/21 °C, 27 °C/24 °C, 30 °C/27 °C and 33 °C/30 °C). Genotypes included 12 snap beans, two wax beans, six dry beans, and four common bean accessions; 18 genotypes were previously described as heat-tolerant and three were heat-sensitive controls. The highest temperature treatment reduced seed number, pod number, mean seed weight and seeds/pod an average of 83%, 63%, 47%, and 73%, respectively. A heat susceptibility index (S) measuring yield stability under high temperatures indicated that `Brio', `Carson', `G122', `HB 1880', `HT 20', `HT 38', `Opus', and `Venture' were heat tolerant. Heat-tolerant genotypes displayed differential responses to high temperature, suggesting different genetic control of heat tolerance mechanisms. Genotypes with moderate heat tolerance, including `Barrier' and `Hystyle', showed stable yields in the 30 °C/27 °C treatment only, indicating this regime is optimal for screening common bean materials of unknown heat tolerance. `Haibushi', `Indeterminate Jamaica Red', and `Tío Canela-75' were previously described as heat tolerant but exhibited a heat-sensitive reaction in this study. Heat-sensitive genotypes `Haibushi' and `Labrador' maintained mean seed weight under high temperature. This data will help utilize nonallelic heat tolerance genes in development of bean varieties grown in high temperature environments.

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Antonio Pompeiano, Nicola Grossi, and Marco Volterrani

Boyd, 2001 ). Excellent heat, drought, salinity, and pest tolerance compared with cool-season turfgrasses has been observed ( Beard, 1973 ; Du et al., 2008 ; Marcum and Murdoch, 1990 ; Marcum et al., 1995 ), resulting in fewer inputs and lower

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Emily B. Merewitz, Thomas Gianfagna, and Bingru Huang

studies in annual crops have implicated CK in the coordination of plant responses to environmental stresses, including drought stress ( Chaves et al., 2003 ). How CK may regulate drought tolerance, particularly in perennial grasses, is not well understood

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Yiwei Jiang, Yu Cui, Zhongyong Pei, Huifen Liu, and Shoujun Sun

deeper root systems and higher carbohydrate levels may promote plant drought tolerance or recovery from stress. However, DI can also cause declines in physiological activities in some grass species if the water deficit level was more severe. Turner et al

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Mageed Abass and C.B. Rajashekar

Heat tolerance and endogenous ABA levels in leaves and cultured grape cells (Vitis spp., cultivars Venus and Veeblanc) were evaluated during beat acclimation. Plants and cultured cells were acclimated at 38 and 36C, respectively. Heat tolerance increased rapidly after exposing plants or cells to acclimation temperatures, reaching a maximum after 10 to 16 hours and 10 to 12 hours for leaves and cultured cells, respectively. Free and bound ABA levels increased sharply during the first hour of heat acclimation, before leaves and cultured cells reached their maximum beat tolerance. The increase in ABA during heat acclimation was 2- to 3-fold that of the nonacclimated control, and the time of the ABA accumulation peak in tissue roughly corresponded to the maximum heat tolerance in leaves and cultured cells. Heat tolerance was induced in cultured cells by exogenous ABA application. Heat tolerance increased significantly after 24 hours of ABA application at 7.6 or 9.5 μm. The results suggest that ABA may be a factor in high-temperature acclimation and beat-tolerance induction in grapes. Chemical name used: abscisic acid (ABA).