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On applying IAA-GB and IAA-NAA mixtures to the hypocotyls ofHelianthus annuus, the plants showed an increase and a decrease,respectively, in their phototropic response compared with thecontrol treated with IAA-H2O only. In the in vitro experimentsit was observed that the illumination (with 1,500 lux light,lasting for 24 hr) caused photoinactivation of IAA in the mixturesof IAA-H2O, IAA-GB and IAA-NAA by 50%, 24% and 0%, respectively.In the presence of 0.01% riboflavin as a photosensitizer inthe same mixtures, the degree of photodestruction of IAA causedby the same illumination was 92%, 97% and 86%, respectively. The stronger positive phototropism in the IAA-GB treated hypocotylwas accounted for by the situation that on the illuminated sidethe photo-inactivation of IAA was accelerated by GB, while onthe shaded side IAA and GB acted synergistically. On the otherhand, the weaker phototropism in the IAA-NAA treated hypocotylwas explained as due to a partial inhibition of photoinactivationof IAA by NAA. (Received October 6, 1962; ) 相似文献
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The effect of gravity compensation by the clinostat on the elongation, weight, and activity of two cell wall-loosening enzymes (cellulase and β-1,3-glucanase) in Helianthus annuus hypocotyls was examined. Gravity compensation increases elongation (28.1 %) and weight (18.3 %). The activity of cellulase extracted from the apical sections is raised, but there is no significant effect on β-1,3-glucanase. The relationship between gravity compensation, changes in auxin level, and function of these two enzymes in respect to elongation is discussed. 相似文献
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METIN AKTA 《Medical and veterinary entomology》1989,3(1):23-27
ABSTRACT. Ctenophthalmus harputus sp.n. is described from the mole rat Spalax ehrenbergi Nehring collected near Elaziǧ city in eastern Turkey. This new flea species is classified in the Ctenophthalmus (Palaeo-ctenophthalmus) fissurus Wagner group. A key is given to the six species of Spalax fleas (Siphonaptera: Hystrichopsyllidae, Ctenophthalmus spp.) recorded from Turkey. 相似文献
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