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EN
Efficacy of a growth promoter ascorbic acid (Vitamin C) on senescence deferral action was analysed using leaf discs of six wild ericoid plant taxa. Changes of some biochemical parameters like chlorophyll, protein, soluble and insoluble carbohydrates, RNA and DNA as well as activity of catalase enzyme were analysed as reliable senescence indices during detached leaf senescence of these six species under dark condition. With the progress of ageing duration from zero to 144 hours the levels of chlorophyll and proteins in leaf discs gradually declined in both control and ascorbic acid treated samples. However, in the chemical / Vitamin-C treated samples the rate of decline was found to be much slower. Concomitantly the levels of insoluble carbohydrate, RNA and DNA started declining right from 48, 96 and 144 hours of observation period both in treated and untreated samples. And here also ascorbic acid arrested the rapid rate of reduction of the levels of the biochemical parameters. On the other hand, soluble carbohydrate level started increasing irrespective of the treatments during the whole observation periods. However, the magnitude of increase was found to be low in case of the leaf samples which experienced treatment with ascorbic acid. The activity of the enzyme catalase was found to decrease progressively during the four observation periods (0, 48, 96 and 144 hours) regardless of the treatments. Ascorbic acid partially averted the rapid fall of the enzyme activity during the ageing periods. Ascorbic acid, a nonconventional senescence deferred thus seems to be a potent senescence deferral phytohormone /chemical / vitamin at least in case of six ericoid wild plant taxa.
4
Content available remote Search for polyprenols in leaves of evergreen and deciduous Ericaceae plants.
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EN
Various species and cultivars of Ericaceae family were checked for the presence of long-chain polyprenols in their leaves. In the genus Rhododendron no polyprenols were found in the ever-green species, while they were present in the deciduous type. The polyprenols were of chain-length of 14-20 isoprene residues and they occurred in the form of acetic acid esters. The polyprenol accumulation is discussed with respect to senescence of leaves.
EN
The paper reports results of a study on the variability of six morphological features of leaves of Chamaedaphne calyculata (L.) Moench, collected at nine sites in Poland and two abroad. The size of the leaves was found to be strongly dependent on the habitat conditions and was the parameter determining the division into ecophenotypic groups. A linear relation was observed between the length and the width of the leaves.
PL
Na obszarze Polski przebiega południowo-zachodnia granica zasięgu chamedafne północnej. Odosobnione, izolowane dziewięć stanowisk leży daleko od współczesnego centrum rozmieszczenia na północy, dlatego można je traktować jako stanowiska reliktowe. Chamaedaphne calyculata (L.) Moench ma wyraźnie zaznaczona amplitudę ekologiczna. Na obszarze Polski i w Rosji występuje w określonych warunkach na torfowiskach wysokich. Chamedafne północna charakteryzuje się zmiennością lokalna. Zmienność ta, zaznaczająca się zmiana wielkości i kształtu liści, jest uwarunkowana przede wszystkim różnymi warunkami siedliskowymi na poszczególnych stanowiskach.
EN
Pretreatment of seeds of seven wild plant taxa (viz., Gaultheria hookeri C. B. Clarke, G. stapfiana Airy Shaw, G. semi-infera (C. B. Clarke) Airy Shaw, G. trichophylla Royle var. ovata Panda & Sanjappa, Lyonia ovalifolia (Wall.) Drude var. ovalifolia, Pieris formosa (Wall.) D. Don and Vaccinium glauco-album C. B. Clarke) in the family Ericaceae using Na-dikegulac (Na-DK) for 8 hours (4 + 4 h in two installments) before keeping in ambient storage condition (32±2 ºC) for different durations (0 and 20 days) slowed down the rapid loss of germination and reduced the time (h) required for 50% seed germination (T50). Concomitantly, the reduction of protein level as well as the activity of catalase of seed kernels during storage period was ameliorated to a significant extent in the chemical pretreated seed lots.
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