Du, H.

Huang, B.

Wang, Z.

English

University of Kentucky

University of Kentucky UKnowledge International Grassland Congress Proceedings XXI International Grassland Congress / VIII International Rangeland Congress Differential Responses of Antioxidant Metabpolism to Heat Stress for Warm‐Season and Cool‐Season Turfgrass Species H. Du Shanghai Jiaotong University, China Z. Wang Shanghai Jiaotong University, China B. Huang Rutgers University Follow this and additional works at: https://uknowledge.uky.edu/igc  Part of the Plant Sciences Commons, and the Soil Science Commons This document is available at https://uknowledge.uky.edu/igc/21/11-1/27 The XXI International Grassland Congress / VIII International Rangeland Congress took place in Hohhot, China from June 29 through July 5, 2008. Proceedings edited by Organizing Committee of 2008 IGC/IRC Conference Published by Guangdong People's Publishing House This Event is brought to you for free and open access by the Plant and Soil Sciences at UKnowledge. It has been accepted for inclusion in International Grassland Congress Proceedings by an authorized administrator of UKnowledge. For more information, please contact UKnowledge@lsv.uky.edu. 　 Multifunctional Grasslands in a Changing World 　 Volume Ⅱ 　 瞯 ]317　 瞯Grasslands/Rangelands Production Systems——— Amenity and Conservation Turf and Turf‐grassDifferential responses of antioxidant metabpolism to heat stress for warm‐season and cool‐seasonturfgrass speciesH . Du , Z . W ang , B . H uangDepartment o f Plant Science , Shanghai Jiao Tong University , Shanghai , China , and Rutgers University , New Brunsw ick ,N J 08901 , USAE‐mail : huang＠ aesop .rutgers .eduKey words : high temperature , turfgrass , oxidative stressIntroduction High temperature is a primary stress limiting grow th of cool‐season grass species , but less detrimental to warm‐season species . Heat stress causes various physiological changes , including antioxidant metabolism . Whether interspecificvariation in turfgrass tolerance to heat stress is related to differential responses of antioxidant enzyme activities is not welldocumented . The objective of this study was to investigate whether superior heat tolerance of warm‐season zoysiagrass ( Zoygiamatrella) and was related to active antioxidant defense systems in comparison to cool‐season tall fescue ( Festuca arundinacea) .Materials and methods �Manila�zoysiagrass and�Barlexnus�tall fescue were planted in plastic pots filled with soil . Zoyziagrassplants were exposed to the optimal temperature of ３４o C or heat stress at ４４o C . Tall fescue plants were exposed to the optimaltemperature of ２４o C or heat stress at ３４o C . The experiment was conducted in a randomized block design with each temperaturetreatment replicated in three grow th chambers . At the beginning of heat stress ( ０ d) and following ６ , １２ , and １８ d of heatstress , turf quality was rated based on the scale of ０ to ９ with ９ being the best ( green , dense canopy ) and ０ being the worst( dead turf ) , and leaf tissues were sampled for the analysis of antioxidant enzyme activity . Superoxide dismutase ( SOD) andascorbic peroxidase ( POD ) activity were measured according to the procedures described in Jiang and Huang ( ２００１ ) w ithmodifications .Results 　 Elevated temperature by １０o C from the optimal level caused decline in turfgrass grow th ( Fig . １) and reduction in PODactivity ( Fig . ２ ) and SOD activity ( Fig . ３ ) and for both turfgrass species , and the decline in all three parameters was lesspronounced in zoysiagrass than tall fescue . In addition , zoysiagrass plants maintained significantly higher turf quality andantioxidant enzyme activities than tall fescue following prolonged period of heat stress ( af ter １２ d) .Figure １ Figure ２ Figure３　 　 　 　 　 　 　 　Figures 1‐3 Changes in tur f quality ( Figure 1) , POD activ ity ( Figure 2) , and SOD activ ity ( Figure 3) during 18 d o f heatstress f or zoysiagrass and tall f escue . Vertical bars are standard er rors at each stress duration f or each species . Columnsmarked w ith lowercase letter are f or comparison between zoysiagrass and tall f escue at a give day o f treatment . Di f f erentletters indicate signi f icant di f f erence between the two species .Conclusions Heat stress induced oxidative damages in both warm‐season and cool‐season turfgrass species . Warm‐seasonzoysiagrass was able to maintain more active antioxidant enzymes during heat stress , which could contribute at least partially toits superior turf performance under heat stress , in comparison to cool‐season tall fescue .ReferencesJiang , Y . and Huang , B . (２００１) Effects of calcium on antioxidant activities and water relations associated with heat tolerancein two cool‐season grasses . Journal o f Ex perimental Botany ５２ , ３４１‐３４９ .

Differential Responses of Antioxidant Metabpolism to Heat Stress for Warm‐Season and Cool‐Season Turfgrass Species

https://uknowledge.uky.edu/cgi/viewcontent.cgi?article=3215&context=igc

Differential Responses of Antioxidant Metabpolism to Heat Stress for Warm‐Season and Cool‐Season Turfgrass Species

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