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Interdependence of plant phloem and phelloderm Plant physiology. Agrochemistry. Soil Science



Interdependence of plant phloem and phelloderm Plant physiology. Agrochemistry. Soil Science



Interdependence of plant phloem and phelloderm Plant physiology Agrochemistry Soil Science Funktsional'naya vzaimoobuslovlennost' floemy i fellodermy u rastenii In: Fiziologiya rastenii Agrokhimiya Pochvovedenie Plant physiology Agrochemistry Soil Science 92-97



When green cuttings of dahlia and of holly-rose were kept 8-16 hours in the light, the O2 content of the intra-tissue gases increased through the loss of CO2. Assimilation by the phelloderm of green stalks of 2-year old shoots of willow, ash and American maple increased 44-fold after removal of the phloem and only 5-fold after removal of the epidermis. The lower ends of longitudinally-cut walnut cuttings were immersed 15 and 20 minutes in a solution of glycine. The phelloderm, illuminated for 24 hours, assimilated the C14O2 formed in respiration; C14O2 was formed in the dark. The intensified respiration of the phloem in maple and Ailanthus shoots, resulting from 40 minutes' immersion in glucose solutions facilitated a decrease in phelloderm assimilation of C14O2 from the atmosphere. In the author's opinion, the chlorophyll of the internal tissues assimilates the CO2 formed by living stalk tissues in respiration. The liberated O2 is absorbed by the phloem cells. Under continuous illumination glycine moved along Boussingaultia cuttings at the rate of 42 cm/hour; in the dark, at 10.4 cm/hour. The difference was caused by the atmospheric O2 supplied through the lenticels.

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