【摘 要】
：
In this paper,the dynamic changes of photosynthesis gas exchange,photosynthetic pigments content,actual PSⅡ efficiency((p)PSⅡ),coefficient for the photochemical quenching of Chl a fluorescence(qP),coe
【机 构】
：
College of Horticulture Science and Engineering,Shandong Agricultural University,Tai'an,Shandong,Ch
【出 处】
：
Vegetable Production,Quality and Process Standardization in
论文部分内容阅读
In this paper,the dynamic changes of photosynthesis gas exchange,photosynthetic pigments content,actual PSⅡ efficiency((p)PSⅡ),coefficient for the photochemical quenching of Chl a fluorescence(qP),coefficient for the nonphotochemical quenching of Chl a fluorescence(qN),and Hill reaction activity,were studied by hydroponic culture to evaluate the photosynthtic capacity of cucumber(Cucummis sativus L.,variety Xintaimici) seedlings under 140 mmol(.)L-1 nitrate stress.The results showed that CO2 assimilation rate and Hill reaction activity of cucumber seedlings under nitrate stress obviously decreased with increasing of treatment time.Photosynthetic pigments content increased during two days after treatment,and decreased to the content level of CK after two days of tratetment; there were little significant differences in Chl a/b,Car/Chl,ΦPSⅡ and qP between seedlings under nitrate stress and CK during preperiod of treatment.
其他文献
Purslane (Portulaca oleracea L.) is an herbaceous annual plant with fleshy succulent leaves that belongs to portulacacea family.Although it is grow as a weed plant in field,but it is cultivated in wid
A field experiment was conducted to determine the effects of MSW (municipal solid waste) compost as an organic material source on the growth and the accumulation of heavy metals in potato plant (Solan
Garlic is one of the oldest known vegetables of the world.Although this crop has been cultivated for thousands of years across Iran.Tabriz is located in the north-west of Iran and the climate is semia
Take fennel seeds from Inner Mongolia as the materials.By using the method of nutrient solution culture,effect of different nitrogen forms (NO3--N/NH4+-N ratio was 50/50,30/70,70/30,100/0,0/100) on pl
Multivariate analysis was carried out for characterization of twenty nine spinach (Spinacea oleracea L.) cultivars and selection of the best cultivars for breeding programs and commercial production o
With the limiting use of chemicals for production of strong seedling,more and more application of supplemental lighting to it can be found in the winter-spring production of greenhouse muskmelon,in wh
Vegetables detection of imidacloprid residue was studied by the two methods of colloidal gold strip and liquid chromatography-mass spectrometry (LC-MS/MS).The test was carried out at Beijing Miyun veg
Mutation breeding is one of the most important breeding approaches.Seeds of the inbred lines 76-2 melon (Cucumis melo var.ameri),with yellow peel,red flesh and no sour tease,were radiated by 60Co-γ ra
Autotoxicity of aqueous extracts from root,stem and leaf of flowering Chinese cabbage (Brassica campestris L.ssp.chinensis var.utilis Tsen et Lee) were studied by hydroponic in different concentration
Lettuce,spinach and most recently tomatoes have been implicated in food borne disease outbreaks in North America.Food borne illnesses can be serious or even fatal,and result in loss of consumer trust