Several groups in the USA have been working to de-velop a low chill apricot that would ripen its fruits veryearly in the season. Unfortunately, the cultivatcd apricothas been developed mainly from the high chilling Eu...Several groups in the USA have been working to de-velop a low chill apricot that would ripen its fruits veryearly in the season. Unfortunately, the cultivatcd apricothas been developed mainly from the high chilling Euro-pean group within the species Prunus armeniaca. Amongthe five groups within the apricot species, this is the mostrecently evolved and least variable (Bailey and展开更多
By measuring chlorophyll fluorescence parameters, composition of fatty acids, active oxygen species and activities ofsome antioxidant enzymes, effects of chilling stress (4C) in the low light (100 mmol m-2 s-1) on chi...By measuring chlorophyll fluorescence parameters, composition of fatty acids, active oxygen species and activities ofsome antioxidant enzymes, effects of chilling stress (4C) in the low light (100 mmol m-2 s-1) on chilling-sensitive plants werestudied. After 6 h chilling stress (4C) in the low light, the maximal photochemical efficiency of PSII (Fv/Fm) of sweetpepper leaves decreased by 35.6%, and the oxidizable P700 decreased by 60%. However, chilling stress in the dark had noeffect on both of them. Unsaturation of fatty acids in thylakoid membrane was accelerated, which might be helpful tostabilize photosynthetic apparatus. Distortion and swelling of grana caused by chilling in the dark probably decreasedactivities of antioxidant enzymes, which resulted in the accumulation of active oxygen species. On the contrary,photooxidation might be related to the disintegration and unstacking of grana. Chilling stress induced photoinhibition ofPSII and PSI, and active oxygen species might be one of the factors causing the decrease of the oxidizable P700. PSIseemed to be more sensitive to chilling stress in the low light than PSII.展开更多
Focused on the major agro-meteorological disaster in northeast China area-low temperature chilling injury,the research progresses of low temperature chilling injury in northeast China were reviewed systematically.The ...Focused on the major agro-meteorological disaster in northeast China area-low temperature chilling injury,the research progresses of low temperature chilling injury in northeast China were reviewed systematically.The basic concepts which included the connotation and extension of chilling damage,the circulation characteristics and effect factors which formed summer low temperature in northeast China,the prediction,forecast and defense of low temperature chilling injury were summarized and done the outlook.展开更多
文摘Several groups in the USA have been working to de-velop a low chill apricot that would ripen its fruits veryearly in the season. Unfortunately, the cultivatcd apricothas been developed mainly from the high chilling Euro-pean group within the species Prunus armeniaca. Amongthe five groups within the apricot species, this is the mostrecently evolved and least variable (Bailey and
基金supported by the State Key Basic Research and Development Plan of China(G1998010100)the National Natural Science Foundation of China(30370854)the open project of Key Lab of Crop Biology of Shandong Province,P.R.China
文摘By measuring chlorophyll fluorescence parameters, composition of fatty acids, active oxygen species and activities ofsome antioxidant enzymes, effects of chilling stress (4C) in the low light (100 mmol m-2 s-1) on chilling-sensitive plants werestudied. After 6 h chilling stress (4C) in the low light, the maximal photochemical efficiency of PSII (Fv/Fm) of sweetpepper leaves decreased by 35.6%, and the oxidizable P700 decreased by 60%. However, chilling stress in the dark had noeffect on both of them. Unsaturation of fatty acids in thylakoid membrane was accelerated, which might be helpful tostabilize photosynthetic apparatus. Distortion and swelling of grana caused by chilling in the dark probably decreasedactivities of antioxidant enzymes, which resulted in the accumulation of active oxygen species. On the contrary,photooxidation might be related to the disintegration and unstacking of grana. Chilling stress induced photoinhibition ofPSII and PSI, and active oxygen species might be one of the factors causing the decrease of the oxidizable P700. PSIseemed to be more sensitive to chilling stress in the low light than PSII.
基金Supported by The National Science and Technology Support Plan(2007BAC29B03)~~
文摘Focused on the major agro-meteorological disaster in northeast China area-low temperature chilling injury,the research progresses of low temperature chilling injury in northeast China were reviewed systematically.The basic concepts which included the connotation and extension of chilling damage,the circulation characteristics and effect factors which formed summer low temperature in northeast China,the prediction,forecast and defense of low temperature chilling injury were summarized and done the outlook.
