摘要:

SUMMARYData are given on the distribution and periodicity of fifteenVaucheriaspecies in three main types of habitat: a ditch, drainage ditches, and pond banks. At five stations a detailed analysis ofVaucheriagrowth was made. On the shores of the ponds from mean water level upwards, four groups of species can be discerned. The occurrence of mostVaucheriaspecies shows a seasonal periodicity.

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1973.tb00831.x

年代:1973

数据来源: WILEY

摘要:

SUMMARYA key is offered to the wood of 35 out of 38Ingaspecies known from Suriname and the other Guianas. The wood structure indicates that the sections Leptinga, Diadema, Bourgonia and Euinga sensu Bentham are taxonomically sound. Section Pseudinga is unnatural and should be subdivided. The author is in favour of keeping the sections Leptinga and Diadema apart.

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1973.tb00832.x

年代:1973

数据来源: WILEY

摘要:

SUMMARYA study was made of the chromosome number of a population ofCochlearia pyrenaicaDC. occurring near Moresnet in NE. Belgium. The diploid number appears to be 12; no accessory chromosomes were observed. The plants studied are characterized by very large heterochromatic regions which are responsible for the appearance of a conspicuous zonation pattern in the chromosomes during late anaphase. The possible significance of this phenomenon in the taxonomy of theCochleariais discussed.

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1973.tb00833.x

年代:1973

数据来源: WILEY

摘要:

SUMMARYTypification ofCordana pauciseptata, the lectotype species of the genusCordana, is briefly discussed. A new species, isolated from soil in Nepal, is described. Short notes are given on some otherCordanaspecies.Cordana bambusaeis discussed; a new combination inEndophragmiopsisis proposed.

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1973.tb00834.x

年代:1973

数据来源: WILEY

摘要:

SUMMARYA conventional late‐glacial and early postglacial percentage pollen diagram that only registers changes in the lake ecosystem in the late‐glacial and not necessarily vegetational events outside the lake basin is, by recalculation of the data and by14C dating, correlated with the Allerød and late‐Drya

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1973.tb00835.x

年代:1973

数据来源: WILEY

摘要:

SUMMARYThe physiological tip of a decapitatedAvenacoleoptile is equivalent to the tip of the intact coleoptile as far as the regulation of the growth and the geotropic reaction is concerned. The regeneration of the physiological tip is completely inhibited by indoleacetic acid, even in concentrations below 0.01 mg/l. The auxin analogues naphthylacetic acid and 2,4‐dichlorophenoxyacetic acid do not repress the auxin synthesi

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1973.tb00836.x

年代:1973

数据来源: WILEY

摘要:

SUMMARYA suspension of carbon black particles, 200–700 Å, was injected from a microcanula into relatively little damaged living sieve elements. The suspension was carried through the sieve plates by the translocation stream in a manner thought to be a type of mass fl

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1973.tb00837.x

年代:1973

数据来源: WILEY

摘要:

SUMMARYFor a number of14C‐sugars and other compounds, it has been shown, that their introduction through the xylem system into detached tops of the inflorescence causes a subsequent exudation of14C‐sucrose from the phloem. D‐glucose, D‐fructose, D‐galactose, maltose and lactose were converted exclusively to sucrose. The fed substance itself was absent in the exudate. Feeding D‐sorbitol and K‐glycerate led to exudation of these substances together with small amounts of sucrose, whereas L‐sorbose, glycerol, glycolic acid and glutamine were not at all converted to sucrose and exuded as such. The results are br

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1973.tb00838.x

年代:1973

数据来源: WILEY

摘要:

SUMMARYA short‐day (SD) photoperiod of 3 to 7 days was critical for delay in budding of defoliated seedlings. Both growth‐stimulating and growth‐inhibiting substances were present inLarixneedle extracts. SD treatment induced a decrease of stimulation and an increase in inhibiting activity. The concentration of one of the main flavonoids, a vitexin derivative, was significantly decreased in SD needle ext

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1973.tb00839.x

年代:1973

数据来源: WILEY

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1973.tb00840.x

年代:1973

数据来源: WILEY