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1. Blue light dosage affects photosynthesis, chlorophyll, and antioxidant properties of Mesembryanthemum crystallinum

Creator:
Zhang, H., Tu, Y., Kang, J., Song, W., and Zheng, L.
Format:
počítač and online zdroj
Type:
model:article and TEXT
Subject:
common ice plant, controlled environment, gas exchange, and light quality
Language:
Multiple languages
Description:
Mesembryanthemum crystallinum is an annual succulent plant that is being used as an emerging healthy leafy vegetable. To investigate the growth and physiological response of M. crystallinum to artificial lighting, five different light treatments were applied at 150 µmol(photon) m-2 s-1, which were white (W), different rations of red/blue (B) (15, 40, and 70%B), and blue (100%B), respectively. Our results showed that plants could gain as much as edible leaf area and dry mass with a certain ratio of blue (40%) in comparison with W. Plants grown under 100%B resulted in reduced photosynthetic rate, leaf area, and fresh mass compared with W. Adding blue fraction in the light regime enhanced the photosynthetic performance by influencing the amount of chlorophyll (Chl), Chl a/b, and specific leaf area. Under red/blue treatments, the electron transport rate and effective quantum yield of both PSII and PSI increased, while the nitrate content was reduced and flavonoids and total antioxidant capacity were unaffected.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

2. 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