会议专题

TALL FESCUE PERFORMANCE AND PROTEIN ALTERATION DURING DROUGHT STRESS

  Cool-season turfgrasses are commonly under drought stress during the summer in the U.S.transition zone.A controlled environment study was conducted to evaluate the performance and protein alteration of tall fescue during drought stress.Mature tall fescue plants of three diverse cultivars,‘Kentucky 31’ (standard),‘2nd Millennium’ (good drought resistance) and ‘Rebel Exeda’ (poor drought resistance) were subjected to two treatments: well-watered and drought.Volumetric soil water content,leaf relative water content,turf quality (TQ),electrolyte leakage (EL),total soluble protein,dehydrin protein expression,and root growth were measured during the study.Under drought stress,TQ decreased for all three cultivars as drought stress increased.After 11 d of drought stress,there were no differences in TQ among the three cultivars and the average TQ rating was 2.The EL results suggested that the three cultivars had similar membrane stability under drought stress throughout the study period.Drought stress induced expression of dehydrin proteins,but there were no differences in soluble proteins or dehydrin protein expression among the three cultivars.Although dehydrin polypeptides were observed in many studies and assumed to contribute to drought tolerance,the results of this study did not indicate a relationship between protein changes and drought tolerance in the tall fescue cultivars.Root length density,root dry weight,and root surface area were highest in ‘2nd Millennium’ in the 0-40 cm profile suggesting that ‘2nd Millennium’ improved field drought performance is mostly due to the ability to avoid drought under field conditions.

dehydrin protein, drought stress, electrolyte leakage leaf relative water content root characteristics turf quality volumetric soil water content

Xiaowei Pan Justin Q. Moss Yanqi Wu Niels O. Maness Kemin Su

Dept. of Horticulture and Landscape Architecture,Oklahoma State University,Stillwater,OK74078 USA

国际会议

The 12th International Turfgrass Research Conference(第十二届国际草坪学术大会)

北京

英文

465-473

2013-07-14(万方平台首次上网日期,不代表论文的发表时间)