摘要:

AbstractLeafy cuttings ofEranthemum tricolorwere treated with tannic acid, gallic acid, p‐hydroxybenzoic acid and salicylic acid at the concentrations of 1000, 100, 10 and 1 nig/1 for 24 hours, whereafter they were dipped quickly in a 1000 mg/l solution of IAA, IBA and NAA for ten seconds.None of the phenolics showed any root promoting effect when used singly. In combination with NAA and IBA tannic acid promoted rooting, however, with IAA there was no effect to be seen. Gallic acid also markedly increased the number of roots of cuttings treated with NAA and IBA. Even in this case there was no effect with IAA.Synergism was also recorded between p‐hydroxybenzoic acid and IAA or NAA but not with IBA.Salicylic acid greatly promoted rooting in combination with both IAA, IBA and

ISSN:0031-9317    

DOI:10.1111/j.1399-3054.1969.tb07419.x

出版商:Blackwell Publishing Ltd    

年代:1969

数据来源: WILEY

摘要:

AbstractThe rate of uptake, the effects of carrier ions, temperature, light intensity and dinitrophenol (DNP) upon the uptake of zinc (using zinc‐65 as tracer) byFontinalis antipyreticawere investigated. The absorption medium contained 0.5 mW CaSO4and the pH was kept constant using boric acid and sodium hydroxide as buffer.About 50 per cent of the zinc absorbed at equilibrium was taken up in the first half hour, Analysis by semi‐log plot procedures showed that, at least, three sections may be distinguished in the uptake curve, suggesting that three successive processes (stages) were involved. The first stage was very short, and not influenced by temperature, light intensity and DNP. The second stage, lasting no more than 90 minutes, mi very slightly affected by the same three factors. In this stage freshly killed plants absorb more zinc than living material. The third stage, lasting several days, was very slow and was light, temperature and DNP dependent.Based on these findings, a mechanism for zinc uptake is propo

ISSN:0031-9317    

DOI:10.1111/j.1399-3054.1969.tb07420.x

出版商:Blackwell Publishing Ltd    

年代:1969

数据来源: WILEY

摘要:

AbstractNonanal, added in ethannlic solution, in concentrations lower than 40 to 80 μM did not affect the growth ofDipodascus aggregatus, provided the inoculum had been harvested from the exponential phase of growth. Growth could even be inhibited by 80 μM.If the inoculum had been grown to the exponential phase and then for another period, to the acceleration phase, in fresh liquid medium, growth was strongly promoted by 80 μM nonanal. If cells from the exponential phase were grown for another period in the supernatant fluid of centrifuged cultures from the exponential phase, 80 μM affected growth in the following way: in five different experiments growth was not stimulated, in one experiment undoubtedly promoted, and weakly stimulated in another one.The growth of cultures inoculated with cells grown only on malt agar was not affected by 80 μM nonanal.Pretreatment of cells, harvested from the acceleration phase, with nonanal (80 μM) in the presence of ethanol did not diminish the growth‐promoting action of nonanal on the cultures inoculated with these cells.Nonanal, in the absence of ethanol, in a concentration of 10 μM did not affect the growth of cells, harvested from the acceleration phase, whereas 100 μM nonanal strongly inhibited growth.An attempt is made to explain the results starting from the endogenous m

ISSN:0031-9317    

DOI:10.1111/j.1399-3054.1969.tb07421.x

出版商:Blackwell Publishing Ltd    

年代:1969

数据来源: WILEY

摘要:

AbstractWith applied to the petioles of detachedBegonia x cheimanthaleaves before planting, Gibberellic acid (GA3) inhibited the formation of adventitious buds and roots ill an apparently irreversible manner. Bud formation was entirely suppressed by 10−6Mand higher concentrations and a significant inhibition was still present at 10−9Mthe lowest concentration tested. Root formation was not affected by GA3below 10−7Mand was possible even at 10−4M GA3. Petiole elongation was stimulated by GA3with an optimum at 10−5M.GA3also blocked the action of 6‐benzyiamino‐purine (BAP) and 1‐naphthaleneacetic acid (NAA), compounds which are potent stimulators of bud and root formation, respectively. When applied simultaneously with GA3they were, at their optimal concentrations, devoid of any effect in counteracting or reversing the gibberellin‐induced inhibitions. Abscisic acid and the growth retardants CCC and Phosfon also were unable to restore bud and root formation.In leaves initially treated with water or 10−5MBAP, endogenous bud and root formation as well as BAP‐induced bud formation were entirety suppressed when 10−5MGA3was applied 8 days after the initial treatments. Even when delayed for 14 days GA3treatment inhibited BAP‐induced bud formation, while treatment after 21 days bad little effect on bud and root formation. Development of pre‐existing, visible bud primordia was not inhibited by GA3.BAP and NAA competitively inhibited the action of GA3in petiole extension growth.The results are discussed in relation to results obtained in other plant systems. It is suggested that GA3acts by blocking of the organized cell divisions initiating the formatio

ISSN:0031-9317    

DOI:10.1111/j.1399-3054.1969.tb07422.x

出版商:Blackwell Publishing Ltd    

年代:1969

数据来源: WILEY

摘要:

AbstractThree marine brown algae have been cultivated with different additions of iodine and bromine in bacteria‐free cultures.Ectocarpus jasciculatusappeared to have an absolute demand for iodine and was inhibited by a concentration of 64 μmol of KJ per 1.Lithosiphon pusillushad the best growth in the highest concentration tested (64 μmol/1) but there was always some growth in the series without iodine. Additions could be made either as inorganic iodine or as organically bound iodine. Additions of KJ to a culture medium consisting of vitamin‐free Asp 6 F with B12(1 μg/1) and kinetin (20 μmol/1) remarkably increased the growth of the zoospores ofPylaiella litoralis.Lithosiphon pusiliusproved to be indifferent to bromide additions in media containing KJ. In media lacking KJ addition of 1 μmol of KBr per 1 is stimulating but higher concentrations of KBr are inhibiting. The inhibiting effect is overcome by iodide

ISSN:0031-9317    

DOI:10.1111/j.1399-3054.1969.tb07423.x

出版商:Blackwell Publishing Ltd    

年代:1969

数据来源: WILEY

摘要:

AbstractPhytol can be gas chromatographed without decomposition on an all‐glass column with 2% Hyprose SP‐80 on Chromosorb W; is stationary phase. Utilizing this a technique has been developed by which phytol of plant origin can be quantitatively determined. The practical limit of sensitivity is about 0.02 μg of ph

ISSN:0031-9317    

DOI:10.1111/j.1399-3054.1969.tb07424.x

出版商:Blackwell Publishing Ltd    

年代:1969

数据来源: WILEY

摘要:

AbstractApplication of gibberellic acid (GA3) before and sucrose after the inductive dark period promotes flowering inXanthium.The promotive effects of these two compounds are independent but additive. Sucrose application either before or utter the dark period has promotive effect on the flowering response. These effects are additive. The roles of pre‐ and post‐induction high‐intensity light period and of GA3in the promotion of flowering have been discussed. It has been suggested that sucrose application promotes flowering by increasing translocation of the flowering stimulus and by promoting the rate of development of the terminal male inflorescence. It has also been suggested that GA3‐induced promotion of flowering is due to the increased synthesis as well as translocation of the flowering

ISSN:0031-9317    

DOI:10.1111/j.1399-3054.1969.tb07425.x

出版商:Blackwell Publishing Ltd    

年代:1969

数据来源: WILEY

摘要:

AbstractThe penetration of naphthaleneacetic acid (NAA) through enzymatically isolated pear leaf cuticle (Pyrus communisL. cv. Bartlett) is reported herein. Penetration of NAA increased with increasing lime and attained a steady state in approximately 20 minutes. The quantity of NAA penetrating was directly related to the concentration of the donor solution. NAA that penetrated the cuticle was shown to he unaltered. The Penetration of NAA from inside to outside is similar to that from outside to inside. Isolated stomatous lower cuticle permitted approximately 10‐foId greater penetration of NAA than the astomatous upper cuticle. The penetration of NAA through isolated pear leaf cuticle is highly temperature dependent, exhibiting a temperature coefficient (Q10) of about 5.6 between 15° and 25 C. The low quantities of chemicals penetrating through the isolated cuticle reported herein and elsewhere are considered to he a characteristic of the technique and not an absolute limitation of the cuticle. Cuticular penetration could account for physiological quantities of NAA entering the pla

ISSN:0031-9317    

DOI:10.1111/j.1399-3054.1969.tb07426.x

出版商:Blackwell Publishing Ltd    

年代:1969

数据来源: WILEY

摘要:

AbstractCyanophages multiplying on the nitrogen fixing blue‐green algaAnabaena variabilisKütz. were revealed by electron microscopy.Severe ultrastructural changes have been observed in the vegetative cells, whereas the heterocysts appeared resistant to the cyanophage. A lytic cycle was observed from adsorption to lys

ISSN:0031-9317    

DOI:10.1111/j.1399-3054.1969.tb07427.x

出版商:Blackwell Publishing Ltd    

年代:1969

数据来源: WILEY

摘要:

AbstractCell‐free extracts of mycelial mats ofPyrenochaeta terrestriscontained an enzyme which hydrolyzed mannitol‐l‐phosphate to mannitol and inorganic phosphate. Greatest mannitol‐1‐phosphatase activity occurred early in the growth period when the mannitol content of the mats was at a maximum. The enzyme was active over a broad pH range with optimum activity between pH 6.5–7.0 in 0.05MTris‐maleate buffer. Maiinitnl‐1‐phosphatase was inhibited by reagents known to inhibit enzymes containing ‐SH groups. A 10‐fold purification was attained by a combination of (NII4)2SO4fractionation and gel filtration on Sephadex G‐100. The partially purified enzyme required Mg−2for activity and did not hydrolyze a number of sugar phosphates. Km values for mannitol‐l‐phosphate and Mg−2with the partially purified extract were 3 ×

ISSN:0031-9317    

DOI:10.1111/j.1399-3054.1969.tb07428.x

出版商:Blackwell Publishing Ltd    

年代:1969

数据来源: WILEY