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- 저자 : Shu-ichi Sugiyama (검색결과 1 건)
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Wagdi Saber Soliman,Shu-ichi Sugiyama,Ahmed M. Abbas 한국원예학회 2018 Horticulture, Environment, and Biotechnology Vol.59 No.1
Salinity is a potential environmental stress factor for plants. Improving plant growth under salinity stress requires an understandingof resistance mechanisms. Salinity stress resistance is related to both salinity avoidance and tolerance. In this study,interspecific differences in salinity stress resistance, avoidance, and tolerance were examined in eight C3turfgrass species,namely Agrostis alba, Agrostis tenius, Dactylis glomerata, Festuca ovina, Festuca rubra, Lolium perenne, Phleum pratense,and Poa pratensis. In a greenhouse experiment, plants were exposed to 50, 100, or 200 mM NaCl for 2 weeks supplied via ahydroponics system. We found that interspecific differences in salinity stress resistance were associated mainly with salinitytolerance. Salinity avoidance mechanisms also contributed significantly to stress resistance. The contribution of genotypetowards interspecific variation in salinity resistance and tolerance was higher than that of Na+concentration. Salinity stresshad negative effects on shoot dry mass, water status, and membrane stability. Relative water content was significantly correlatedwith salinity resistance, avoidance, and tolerance, whereas no significant correlation was observed for ion leakage. Mineral contents showed no clear contribution to salinity tolerance. Species varied in their proline content even in controlconditions, and there was a positive association between proline content and salinity resistance and tolerance, but a negativeassociation between proline content and salinity avoidance. F. ovina and P. pratense displayed the highest and lowest salinitystress resistance, respectively. The results of this study suggest that both salinity tolerance and avoidance mechanismscontribute towards salinity resistance, and that variation in salinity stress resistance among species is attributed to differencesin proline content.
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