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Tomato expressing Arabidopsis glutaredoxin gene AtGRXS17 confers tolerance to chilling stress via modulating cold responsive components

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Horticulture Research 2015年第1期2卷 60-70页

作者： Ying Hu Qingyu Wu stuart a sprague Jungeun Park Myungmin Oh C B Rajashekar Hisashi Koiwa Paul A Nakata Ninghui Cheng Kendal D Hirschi Frank F White Sunghun Park Department of Horticulture Forestryand Recreation ResourcesKansas State UniversityManhattan66506KSUSA Department of Horticultural Science Texas A&M UniversityCollege Station77843TXUSA United States Department of Agriculture/Agricultural Research Service Department of PediatricsChildren’s Nutrition Research CenterBaylor College of MedicineHouston77030TXUSA Department of Plant Pathology Kansas State UniversityManhattan66506KSUSA Cold Spring Harbor Laboratory Cold Spring HarborNY 11724USA Present address:Department of Horticultural Science Chungbuk National UniversityCheongju 361-763South Korea Department of Plant Pathology University of FloridaGainesvilleFL 32611USA

Chilling stress is a production constraint of tomato,a tropical origin,chilling-sensitive horticultural *** development of chilling tolerant tomato thus has significant potential to impact tomato ***(GRXs)are ubiquitous oxidoreductases,which utilize the reducing power of glutathione to reduce disulfide bonds of substrate proteins and maintain cellular redox ***,we report that tomato expressing Arabidopsis GRX gene AtGRXS17 conferred tolerance to chilling stress without adverse effects on growth and ***17-expressing tomato plants displayed lower ion leakage,higher maximal photochemical efficiency of photosystem II(Fv/Fm)and increased accumulation of soluble sugar compared with wild-type plants after the chilling stress ***,chilling tolerance was correlated with increased antioxidant enzyme activities and reduced H2O2 *** the same time,temporal expression patterns of the endogenous C-repeat/DRE-binding factor 1(SlCBF1)and CBF mediated-cold regulated genes were not altered in AtGRXS17-expressing plants when compared with wild-type plants,and proline concentrations remained unchanged relative to wild-type plants under chilling *** fluorescent protein-AtGRXS17 fusion proteins,which were initially localized in the cytoplasm,migrated into the nucleus during chilling stress,reflecting a possible role of AtGRXS17 in nuclear signaling of chilling stress ***,our findings demonstrate that genetically engineered tomato plants expressing AtGRXS17 can enhance chilling tolerance and suggest a genetic engineering strategy to improve chilling tolerance without yield penalty across different crop species.

关键词： expressing stress S17

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