1915
DOI: 10.1086/331507
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The Origin of the Inflorescences of Xanthium

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Cited by 9 publications
(8 citation statements)
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“…EVALUATION OF RESPONSE: Although investigations of photoperiodic responses have generally been reported in terms of the presence or absence of flower primordia, proper evaluation of the results reported here demanded a graduated measure. It was obvious from previous reports (9,15) and from preliminary dissections that the development of the inflorescence of cocklebur was not an all or none affair and that the amount of floral development in a given time depended upon the level of the initial stimulus that initiated it. Thus, it was decided to divide the development of the inflorescence into several easily identifiable stages.…”
Section: Methods and Resultsmentioning
confidence: 98%
See 1 more Smart Citation
“…EVALUATION OF RESPONSE: Although investigations of photoperiodic responses have generally been reported in terms of the presence or absence of flower primordia, proper evaluation of the results reported here demanded a graduated measure. It was obvious from previous reports (9,15) and from preliminary dissections that the development of the inflorescence of cocklebur was not an all or none affair and that the amount of floral development in a given time depended upon the level of the initial stimulus that initiated it. Thus, it was decided to divide the development of the inflorescence into several easily identifiable stages.…”
Section: Methods and Resultsmentioning
confidence: 98%
“…The exudation and subsequent resorption of a drop of liquid pulls the grain through the micropyle to the surface of the nucellus where the grain develops a pollen tube directed into the nucellar tissue. Growth ceases over the winter but resumes again the following spring when the pollen tube completes its passage through the nucellus into the neck of an archegonium where it ruptures, releasing the stalk cell and the tube and sperm nuclei (1,3,4,9,13). During this year of life the pollen grain develops a relatively long tube and presumably respires actively except for the cold winter months.…”
Section: Literature Citedmentioning
confidence: 99%
“…consists of only two flowers and is borne in the axil of a bract, \vhich should be considered as the inflorescence bract. I t is surrounded by a \vIlorl of involucral bracts, as described by Farr (1915), which do not, however, persist but fall oif a t the fruiting stage.…”
Section: Observationsmentioning
confidence: 98%
“…However, most studies were devoted to the initiation and development of the terminal staminate inflorescence, and little is known about the formation of the lateral pistillate inflorescences. Their gross morphological and anatomical development has been described in a few studies (4,8,9,12), and fragmentary physiological aspects have been considered in some other reports (12,13,19,20).…”
Section: Introductionmentioning
confidence: 97%
“…However, most studies were devoted to the initiation and development of the terminal staminate inflorescence, and little is known about the formation of the lateral pistillate inflorescences. Their gross morphological and anatomical development has been described in a few studies (4,8,9,12), and fragmentary physiological aspects have been considered in some other reports (12,13,19,20).The available information on factors that affect sex expression in cocklebur is also very scarce. Effects of photoperiod (12) and nutrition (13) have been described, and it was reported that exogenous GA3 decreased the male to female ratio in a dayneutral strain (21).…”
mentioning
confidence: 99%