Naked oat(Avena nuda L.) was originated from China,where soil nitrogen(N) is low availability.The responses of chlorophyll(Chl.) fluorescence parameters and leaf gas exchange to N application were analysed in th...Naked oat(Avena nuda L.) was originated from China,where soil nitrogen(N) is low availability.The responses of chlorophyll(Chl.) fluorescence parameters and leaf gas exchange to N application were analysed in this study.After the N application rate ranged from 60 to 120 kg ha-1,variable fluorescence(F v),the maximal fluorescence(F m),the maximal photochemical efficiency(F v /F m),quantum yield(Φ PS II) of the photosynthetic system II(PS II),electron transport rate(ETR),and photochemical quenching coefficient(qP) increased with N application level,however,non-photochemical quenching coefficient(qN) decreased.Moreover,there was no difference in initial fluorescence(F o) with further more N enhancement.The maximum net photosynthetic rate(P max),apparent dark respiration rate(R d) and light saturation point(LSP) were improved with 40-56 kg N ha-1as basal fertilizer and 24-40 kg N ha-1as top dressing fertilizer applied at jointing stage.Initial quantum yield(α) was decreased with 24 kg N ha-1as basal fertilizer and 56 kg N ha-1as top dressing fertilizer.Flag-leaf net photosynthetic rate(P n) was significantly enhanced at the jointing and heading stages with 40-56 kg N ha-1as basal fertilizer; in addition,increased at grain filling stage of naked oat with 40-56 kg N ha-1as top dressing fertilizer.90 kg N ha-1(50-70% as basal fertilizer and 30-50% as top dressing fertilizer) application is recommended to alleviate photodamage of photosystem and improve the photosynthetic rate in naked oat.展开更多
基金the study grants from the Special Fund for Agro-Scientific Research in the Public Interest,China(nyhyzx07-009-2)the Earmarked Fund for China Agriculture Research System(CARS-08-B-1)
文摘Naked oat(Avena nuda L.) was originated from China,where soil nitrogen(N) is low availability.The responses of chlorophyll(Chl.) fluorescence parameters and leaf gas exchange to N application were analysed in this study.After the N application rate ranged from 60 to 120 kg ha-1,variable fluorescence(F v),the maximal fluorescence(F m),the maximal photochemical efficiency(F v /F m),quantum yield(Φ PS II) of the photosynthetic system II(PS II),electron transport rate(ETR),and photochemical quenching coefficient(qP) increased with N application level,however,non-photochemical quenching coefficient(qN) decreased.Moreover,there was no difference in initial fluorescence(F o) with further more N enhancement.The maximum net photosynthetic rate(P max),apparent dark respiration rate(R d) and light saturation point(LSP) were improved with 40-56 kg N ha-1as basal fertilizer and 24-40 kg N ha-1as top dressing fertilizer applied at jointing stage.Initial quantum yield(α) was decreased with 24 kg N ha-1as basal fertilizer and 56 kg N ha-1as top dressing fertilizer.Flag-leaf net photosynthetic rate(P n) was significantly enhanced at the jointing and heading stages with 40-56 kg N ha-1as basal fertilizer; in addition,increased at grain filling stage of naked oat with 40-56 kg N ha-1as top dressing fertilizer.90 kg N ha-1(50-70% as basal fertilizer and 30-50% as top dressing fertilizer) application is recommended to alleviate photodamage of photosystem and improve the photosynthetic rate in naked oat.