Search

Start Over Creator Li, Z. Subject 581 Subject výměna plynu

1. Increased water supply promotes photosynthesis, C/N ratio, and plantamajoside accumulation in the medicinal plant Plantago depressa Willd

Creator:
Li, Z., Bai, W., Zhang, L., and Li, L.
Format:
print, bez média, and svazek
Type:
model:article and TEXT
Subject:
biomasa, chlorofyl, biomass, chlorophyll, změny klimatu, řízené prostředí, výměna plynu, fenolické sloučeniny, mezibuněčné koncentrace CO2, rychlost čisté fotosyntézy, stomatální vodivost, Plantago depressa, climate change, controlled environment, gas exchange, phenolic compounds, C/N ratio, intercellular CO2 concentration, net photosynthetic rate, plantamajoside, stomatal conductance, 2, and 581
Language:
Multiple languages
Description:
Anthropogenic activities are changing global precipitation regimes and result in many middle latitude arid and semiarid regions experiencing less precipitation and more extreme weather events. However, little is known about the response of active ingredient accumulation in the medicinal herb Plantago depressa Willd. Therefore, we carried out a greenhouse experiment in order to study effect of control (CK, normal water supply equal to 309 mm per four months), -30 (-WS) and +30% (+WS) of the control water supply on the photosynthesis (PN), C/N ratio, and plantamajoside accumulation in P. depressa. Our results showed that compared with the-WS and CK treatments, the +WS treatment significantly enhanced biomass, the C/N ratio, plantamajoside concentration, yield in shoots and roots, and PN, but declined the N concentration in shoots and roots. The plantamajoside concentration was positively correlated with PN, the soluble sugar content, and the C/N ratio, but negatively correlated with the N concentration. Our results suggested that, under experimental conditions, +WS increased the C/N ratio and promoted the plantamajoside accumulation of P. depressa., Z. Li, W. Bai, L. Zhang, L. Li., and Obsahuje bibliografii
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

2. The effect of CaCl2 on calcium content, photosynthesis, and chlorophyll fluorescence of tung tree seedlings under drought conditions

Creator:
Li, Z., Tan, X. F., Lu, K., Liu, Z. M., and Wu, L. L.
Format:
print, bez média, and svazek
Type:
model:article and TEXT
Subject:
chlorid vápenatý, výměna plynu, calcium chloride, gas exchange, Vernicia fordii, water stress, 2, and 581
Language:
Multiple languages
Description:
The study investigated the effects of different CaCl2 concentrations (2, 5, and 10 mM) on photosynthetic enzymatic activities, photosynthesis, and chlorophyll fluorescence of tung tree seedlings under drought conditions. Plants were sprayed with either CaCl2 or distilled water until run-off. Irrigation was then withheld to induce drought stress. The strength of drought stress was evaluated by relative leaf water content and soil water content, which was 27.3 and 9.5% on day 0 and day 12, respectively. Drought stress decreased activities of ribulose-1,5-bisphosphate carboxylase/oxygenase and phosphoenolpyruvate carboxylase, chlorophyll (a+b) content, net photosynthetic rate, stomatal conductance, transpiration rate, electron transport rate, the maximal quantum yield of PSII photochemistry, and effective quantum yield of PSII in tung tree seedlings. The CaCl2 pretreatments alleviated the negative effect of drought stress to some degree on all the parameters mentioned above., Z. Li, X. F. Tan, K. Lu, Z. M. Liu, L. L. Wu., and Obsahuje bibliografii
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public