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1992 (1)
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1Author    JosieL. Shute, PabloS. Jourdan, RichardL. MansellRequires cookie*
 Title    UDP-Glucose: Glucosyltransferase Activity Involved in the Biosynthesis of Flavonol Triglucosides in Pisum sativum L. Seedlings  
 Abstract    From young, light-grown seedlings o f Pisum sativum L. an enzyme activity catalyzing the glu-cosylation o f kaempferol and quercetin in the 3-position to form the 3-0-triglucoside derivative has been demonstrated. The reaction proceeds from the aglycone via the mono-and diglucoside intermediates. The triglucoside can be produced from any o f the less substituted derivatives with uridine diphosphate-Z)-glucose (U D P G) as the glucosyl donor. Young leaf tissues had much high­ er levels o f glucosyltransferase activity than the petioles and internodes. This is the first report o f the synthesis o f flavonol-3-0-triglucosides in vitro. 
  Reference    Z. Naturforsch. 34c, 738 (1979); received June 25 1979 
  Published    1979 
  Keywords    Pisum sativum, Peas, Flavonols, Triglucosides, Glucosyltransferase 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0738.pdf 
 Identifier    ZNC-1979-34c-0738 
 Volume    34 
2Author    K. N. Singh, J. Prakash, A. K. Agarwal, G. S. SinghalRequires cookie*
 Title    Interaction of Herbicides with Pea Chloroplasts  
 Abstract    We have studied the effect o f three herbicides viz., triazole, pyrazon and m etribuzin on total chlorophyll, carotenoids and cell protein in leaves, and PS II and PS I activity in the chloroplasts isolated from control and herbicide treated pea plants. Pyrazon and m etribuzin at 10 (iM concen­ tration affect these parameters resulting in the chlorosis o f the leaves. 
  Reference    Z. Naturforsch. 39c, 464—467 (1984); received January 20 1984 
  Published    1984 
  Keywords    Pea, Chloroplast, Herbicides, M etribuzin, Pyrazon, Triazole 
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 TEI-XML for    default:Reihe_C/39/ZNC-1984-39c-0464.pdf 
 Identifier    ZNC-1984-39c-0464 
 Volume    39 
3Author    Jack FarineauRequires cookie*
 Title    In Pea Thylakoids, a Special Thermoluminescence Band Was Observed at Low Temperature after Photoinhibitory Treatments Performed under Aerobic Conditions, either in vivo (in Leaf) or in vitro  
 Abstract    Characteristics o f thermoluminescence (TL) glow curves were studied in thylakoids isolated from pea leaves after an exposure to very high light in the TL device. The inhibition o f p h oto­ synthesis was detected both as decreases o f oxygen evolution rates and o f variable fluores­ cence. In another more classical experiment, leaves were exposed to high light at low tempera­ ture (5 °C) for 4 h and recovery o f normal PS II characteristics were followed during a 20 h time period under low light at 20 °C. TL study was performed on thylakoids isolated from these leaves. Charging o f bands was performed by an illumination at low temperature (-8 0 °C). Illumination at low temperature (-8 0 °C) induces 2 types o f TL bands called Z variable (Zv) band peaking at about —70 °C and a classical B band peaking at 35 °C. B band is ascribed to recombination in pairs S2/3QB", whereas the origin o f Zv bands remains unclear. M odified Zv bands, with flat shape and presenting a large part resistant to ethanol, were evidenced after som e minutes o f dark adaptation, both in light-exposed thylakoids and in thylakoids isolated from photoinhibited leaves. This ethanol resistant part in Zv band was only induced by p h oto­ inhibitory treatment performed under aerobic conditions (2 1 % 0 2 in media), both in vitro and in vivo; thus, the appearance o f the special Zv band would be related to an oxidative process accompanying photoinhibition. B bands presented reduced sizes and a shift o f peak maximum o f about 5 °C after some minutes o f dark adaptation. In vivo, the recovery o f a high PS II activ­ ity and o f B bands displaying normal characteristics occurs parallely to reappearance o f Zv bands with normal shape and with a vestigial ethanol resistant band. 
  Reference    Z. Naturforsch. 47c, 875—8 (1992); received July 27/A ugust 27 1992 
  Published    1992 
  Keywords    Pea, Photoinhibition, Photosystem II, Thermoluminescence, Thylakoid, Zv Band 
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 TEI-XML for    default:Reihe_C/47/ZNC-1992-47c-0875.pdf 
 Identifier    ZNC-1992-47c-0875 
 Volume    47