2 edition of Structural studies of trimorphic incompatibility in Pontederia sagittata Presl. (Pontederiaceae). found in the catalog.
Structural studies of trimorphic incompatibility in Pontederia sagittata Presl. (Pontederiaceae).
Robin Wendell Scribailo
Written in English
|The Physical Object|
|Number of Pages||147|
HERBERT G. BAKER. An Outline of the History of Anthecology, or Pollination Biology**Based on, but expanded and updated from, a paper published in the N.Z. J. Bot. (Baker, Scribailo RW, Barrett SCH. Pollen-pistil interactions in tristylous Pontederia sagittata Presl. (Pontederiaceae) 1. Floral heteromorphism and structural features of the pollen tube pathway. – Amer. J. Bot. Sharma AK, Sharma A.
Tristyly involves three different forms of flowers that differ reciprocally in the heights of stigmas and anthers within flowers. Apart from the style and stamen lengths, heterostylous species also d. self-incompatibility due to structural differences among the heteromorphic flowers. One factor thought to contribute to self-incompatibility in pickerelweed is differential pollen tube growth among the three types of pollen produced by this species. A study of in vitro.
Finally, the obturator is also implicated in recognition of legitimate and illegitimate pollen tubes in the self‐incompatible species Pontederia sagittata C. Presl.; when illegitimate pollen tubes fail to contact the obturator, pollen tubes cannot respond to directional signals from the ovule (Scribailo and Barrett, ). Genetic incompatibility in plants is generally viewed as a mechanism to prevent inbreeding depression by en- forcing outcrossing. Conflicts between the traditional view that selfing is disadvantageous (Darwin, , ) and the more recent realization that there is a cost to out- crossing (Fisher, 1 ;Williams, ; Maynard Smith, ; Nagylaki, ) have renewed interest in under.
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Populations of Pontederia sagittata from the northern coastal plain of Mexico possess a tristylous breeding system. Styles and stamens are reciprocally arranged in the three floral morphs. Differences in anther size, pollen size and pollen production are associated with the three anther by: PDF | Heteromorphic characters and structural features of the pollen tube pathway are described in tristylous Pontederia sagittata to assess their | Find, read and cite all the research you.
PDF | On Dec 1,Robin W. Scribailo and others published Pollen-Pistil Interactions in Tristylous Pontederia sagittata (Pontederiaceae). Floral Heteromorphism and Structural Features of. PDF | Pollen tube behavior was compared after legitimate and illegitimate pollinations of tristylous Pontederia sagittata.
All pollinations resulted in | Find, read and cite all the research. Request PDF | Studies on hitherto unknown fruits and seeds of some Rafflesiaceae, and a method to manually pollinate their flowers for research and conservation | The fruits and seeds of Sapria.
Pontederia cordata L. (Pontederiaceae), a perennial diploid, possesses the rare genetic polymorphism tristyly. A controlled pollination programme was conducted over a three year period, under glasshouse conditions, on 36 clones of P.
cordata var. cordata to examine the nature of the self-incompatibility system. The three major findings of the pollination study were: (1) the three floral morphs. Populations of Pontederia rotundifolia in the Lower Amazon and Costa Rica are tristylous.
A strong pollen trimorphism is associated with differences in stamen and style length in the three floral forms. The results of a controlled pollination programme with thirty individual plants of P. rotundifolia demonstrate that floral trimorphism is accompanied by a physiological self‐incompatibility.
Scribailo RW () Structural studies of trimorphic incompatibility in Pontederia sagittata Presl. (Pontederiaceae). (Pontederiaceae). PhD Thesis, Univ Toronto, Toronto, Canada Google Scholar.
Glover, DE and Barrett, SCH () Trimorphic incompatibility in Mexican populations of Pontederia sagittata Presl. (Pontederiaceae). (Pontederiaceae). New Phytologist – The potential inhibitory effects of incompatible pollen on outcrossed seed set were investigated in mass-flowering, self-incompatible, tristylous Pontederia sagittata.
Prior application of self pollen, followed after 2, 4, or 6 h by compatible pollen, was conducted on five genotypes of each of the three style morphs under uniform glasshouse conditions.
TRIMORPHIC INCOMPATIBILITY IN PONTEDERIA SUBOVATA (PONTEDERIACEAE): AN AQUATIC MACROPHYTE FROM LOWLAND SOUTH AMERICA Adriana Puentes,1,* William W. Cole,* and Spencer C.
Glover DE, Barrett SCH () Trimorphic incompatibility in Mexican populations of Pontederia sagittata Presl. (Pontederiaceae). (Pontederiaceae). New Phytol – Google Scholar. integumentary obturator. The similarity in structural features of the pollen tube pathway of P.
sagittata to those found in monocotyledonous taxa with gametophytic self-incompatibility suggests that phylogenetic constraints may have influenced the evolution of trimorphic incom-patibility in the Pontederiaceae.
Several hypotheses have been. Pollen-pistil interactions in tristylous Pontederia sagittata Presl. (Pontederiaceae). Floral heteromorphism and structural features of the pollen tube pathway. American Journal of Botany – Scribailo, R.W. & Barrett, S.C.H. Pollen-pistil interactions in tristylous Pontederia sagittata Presl.
(Pontederiaceae). Variation in expression of trimorphic incompatibility in Pontederia cordata L. (Pontederiaceae). Theoretical and Applied Genetics, 70, (pdf). Pontederia sagittata and other monocots possessing gametophytic self-incompatibility share the occurrence of ovarian inhibition of incompatible pollen tubes (Scribailo & Barrett, a).
If trimorphic self-incompatibility in Pontederiaceae evolved from an immediate ancestor with self-compatibility, the details of self-incompatibility. Indeed, several studies have examined pollen loads in natural populations of P. cordata L. (Price and Barrett, ; Barrett and Glover, ; Glover and Barrett, ) and P.
sagittata C. Presl (Glover and Barrett, ), the former providing strong evidence for Darwin's cross‐promotion hypothesis (reviewed in Lloyd and Webb, b). 1. Introduction. The family Pontederiaceae consists of six genera and approximately 35 species of aquatic plants (Cook,Barrett, ).The genera Eichhornia Kunth (∼8 spp.), Heteranthera Ruiz et Pav.
(∼13 spp.) and Pontederia L. (∼6 spp.) have pantropical distributions; Monochoria Presl. (∼7 spp.) occurs in Africa, Asia and Australia; Scholleropsis H. Pers. (1 sp.) occurs. deed, several studies have examined pollen loads in natural popu-lations of P. cordata L. (Price and Barrett, ; Barrett and Glover, ; Glover and Barrett, ) and P.
sagittata C. Presl (Glover and Barrett, ), the former providing strong evidence for Darwin’s cross-promotion hypothesis (reviewed in Lloyd and Webb, b). IN and the Portuguese botanist Henriques described trimorphic heterostyly in two forms of Narcissus which he called N.
triandrus L. and N. reflexus Brot., both belonging to N.Eichhornia azurea is a mat-forming, clonal aquatic that inhabits lakes, marshes and river systems in many parts of the Neotropics. The species is tristylous with long- mid- and short-styled morphs commonly represented in natural populations.
To investigate whether E. azurea possesses a trimorphic incompatibility system typical of tristylous species, a controlled pollination experiment was.Variation in expression of trimorphic incompatibility in Pontederia cordata L. (Pontederiaceae). Barrett SC(1), Anderson JM. Author information: (1)Department of Botany, University of Toronto, M5S 1A1, Toronto, Ontario, Canada.
Pontederia cordata L. (Pontederiaceae), a perennial diploid, possesses the rare genetic polymorphism tristyly.