摘要:

SUMMARYA method is described for the isolation, purification and extraction of the triterpene particles ofHoya australisR. Br. ex Traill. (Asclepiadaceae) andEuphorbia miliiDesm. (Euphor‐biaceae).Chemical data and morphological properties of the triterpene particles ofH. australisare presented and discusse

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1976.tb01048.x

年代:1976

数据来源: WILEY

摘要:

SUMMARYThe morphology ofAcrochaetium dasyaeCollins is described in detail from material collected along the Dutch coast. This material consists of predominantly unisexual gametophytes with a prominent persistent basal spore and a multicellular filamentous prostrate system, which may be more or less endophytic inDasya pedicellata(C. Ag.) C. Ag.. Some additional remarks are made on field‐collected specimens ofA. dasyaefrom Swedish and Eastern‐Canadian coasts. The life‐history was completed in culture and turned out to be a diplobiontic cycle consisting of slightly heteromorphic generations. Gametophyte and tetrasporophyte differ in persistence or non‐persistence of the basal spore, and to a lesser degree in morphology of the basal system and arrangement of the monosporangia.Material presumably representing the tetrasporophyte was found in two Dutch and several Canadian samples and provisionally identified asAudouinella saviana(Menegh.) Woelkerling; it occurs as an epiphyte on several macroalgae and onZosterasp..No decision could yet be made concerning the possible conspecificity ofA. dasyaewith several other species, described either as gametophytes or tetraspor

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1976.tb01049.x

年代:1976

数据来源: WILEY

摘要:

SUMMARYThe genetics of flower colour was studied in two subspecies ofViola calaminaria. One major gene could account for the “yellow‐blue” phenotype, if we assume that inheritance is tetrasomic.The implications for the origin of the two subspecies are disc

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1976.tb01050.x

年代:1976

数据来源: WILEY

摘要:

SUMMARYThe possible protection against photo‐oxidative degradation of chlorophyll and carotene inCucumisleaf discs at 1°C by a wide variety of compounds was investigated. Dimethyl sulphoxide and glycerol as well as ferricyanide, ascorbate, KCN and hydroxylamine were ineffective. Photo‐oxidation was, however, at least partly, prevented by benzoquinone, hydroquinone, naphtoquinone, guajacol, benzidine, diaminobenzidine, alizarinesulphonicacid, triphenyltetrazoliumchloride and 3‐(3,4‐dichlorophenyl), 1,1‐dimethylureea. Photo‐oxidative damage was promoted by salicylaldoxine, disalicylidenediaminopropane, azide, ethylenediamine tetraacetic acid, trishydroxymethylaminomethane, diquat and benzylviologen. It was also increased at high pH values. It is suggested that the mechanism of protection ofCucumisleaf chloroplasts against low temperature photo‐oxidative damage is a protection of the electron transport pathway from the reducing to the oxidizing side of th

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1976.tb01051.x

年代:1976

数据来源: WILEY

摘要:

SUMMARYIrradiation with red light enhances growth and geotropic curving of decapitatedAvenacoleoptiles. The regeneration of a physiological tip appears to be retarded which indicates an increase of available auxin in the subapical parts of the coleoptile.

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1976.tb01052.x

年代:1976

数据来源: WILEY

摘要:

SUMMARYCycloheximide (CHM) inhibits translocation of14C‐α‐amino‐iso‐butyric acid in excised leaves ofSagittaria graminea, but does not affect its uptake. Protein synthesis was also inhibited by CHM.A possible connection between various processes in which CHM is involved is d

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1976.tb01053.x

年代:1976

数据来源: WILEY

摘要:

SUMMARYThe relative amounts of chlorophyllb(Cb) and various chlorophylla(Ca) forms in nine plant species were determined by computer analysis of low‐temperature absorption spectra.The results show that (a) the amount of Cbis inversely related to the sum of the amounts of the bulk Cafrom both photosystems, (b) a direct correlation is likely to occur between the amounts of Cband the Cabands peaking around 685 nm and 640 nm, and (c) no correlation exists between the amounts of Cband the Ca662 and Ca695 forms.These data are interpreted to suggest that Cbis capable of taking over the antenna function of the bulk Ca, whereas it may occur in a complex carrying the Ca685 form as wel

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1976.tb01054.x

年代:1976

数据来源: WILEY

摘要:

SUMMARYCharred rye grains recovered from two settlement sites indicate that in the Netherlands,Secale cerealewas grown by native farmers in the first centuries A.D. and probably already in the last centuries B.C.

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1976.tb01055.x

年代:1976

数据来源: WILEY

摘要:

SUMMARYFourteen new species belonging toTaraxacumsect.VulgariaDahlst. are described and their area of distribution is given:T. angulare, T. arenarium, T. armatifrons, T. ekmaniiforme, T. flandricum, T. lancidens, T. nitidum, T. pachymeroides, T. planoides, T. recessum, T. retusum, T. texelense, T. tortuosumandT. unguifrons.

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1976.tb01056.x

年代:1976

数据来源: WILEY

摘要:

SUMMARYThe pollination‐induced wave of peroxidase isoenzyme 10 activity in matureNicotiana alatastyles does not occur in immature styles unless pollinated within one day before anthesis. The capacity of a style to increase peroxidase 10 activity arises at the same time as the shift from compatibility to incompatibility. In styles selfed at 4 days after anthesis the peroxidase 10 wave is transmitted with a higher speed as compared to styles selfed at anthesis.The present results are discussed in relation to the hypothesis that peroxidase 10 is involved in the rejection of incompatible pollen tubes. It is not clear yet whether the presence of this isoenzyme is necessary to stop incompatible pollen tube growth. However, there exists a positive correlation between peroxidase 10 activity and the strength of the rejection reactio

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1976.tb01057.x

年代:1976

数据来源: WILEY