Changes in glucose and fructose level inNicotiana alata styles and ovaries accompanying compatible and incompatible pollen tube growth

1961 ◽  
Vol 3 (1) ◽  
pp. 1-14 ◽  
Author(s):  
Jaroslav Tupý
Keyword(s):  
Pollen Tube ◽  
Pollen Tube Growth ◽  
Tube Growth ◽  
Incompatible Pollen ◽  
Incompatible Pollen Tube

Pollen tube growth in tristylous Pontederia cordata (Pontederiaceae)

1986 ◽  
Vol 64 (11) ◽  
pp. 2602-2607 ◽  
Author(s):  
J. M. Anderson ◽  
S. C. H. Barrett
Keyword(s):  
Pollen Tube ◽  
Pollen Tube Growth ◽  
Pollen Tubes ◽  
Tube Growth ◽  
Pollen Size ◽  
Tube Length ◽  
Pontederia Cordata ◽  
Incompatible Pollen ◽  
Hand Pollination ◽  
Pollen Tube Length

Pollen tube growth rates in legitimate cross- and self-pollinations were compared by controlled hand pollination in two varieties of Pontederia cordata L. (Pontederiaceae). In each pollen–stigma combination pollen germinated readily on stigmas and pollen tubes penetrated stigmatic tissue. Pollen tube length in styles was positively correlated with pollen size. In most pollinations legitimate pollen tubes grew more rapidly in styles than self pollen tubes. This difference was statistically significant in most comparisons. Inhibition of incompatible pollen tubes was either in the style or ovary. It is suggested that the mechanisms of incompatibility may differ among the floral morphs and depend on the particular pollen size involved in pollinations. The observed differences in pollen tube growth of legitimate cross- and self-pollinations in P. cordata suggest that the species is primarily outbreeding.

Post-Zygotic Seed Abortion in Sexual Diploid × Apomictic Tetraploid Intraspecific Paspalum Crosses

1994 ◽  
Vol 42 (4) ◽  
pp. 449 ◽  
Author(s):  
GA Norrmann ◽  
OA Bovo ◽  
CL Quarin
Keyword(s):  
Pollen Tube ◽  
Success Rate ◽  
Pollen Tube Growth ◽  
Endosperm Development ◽  
Tube Growth ◽  
Seed Abortion ◽  
Self Incompatibility ◽  
Incompatible Pollen ◽  
Incompatibility System

In many species of Paspalum, diploid (2x) cytotypes are usually outbreeders due to a self incompatibility system, while tetraploid (4x) conspecific counterparts are pseudogamous self-fertile apomicts. Intraspecific crossability between 2x female and 4x male cytotypes was investigated using classical methods of crossing in P. almum, P. brunneum, P. rufum, P. intermedium and P. quadrifarium. Expected triploid BII hybrids were obtained in P. intermedium (crossability: 0.004%) and in P. brunneum (crossability: 0.015%). In P. rufum, only tetraploid BIII hybrids were achieved with a crossability of 0.025% Looking for a better performance, in vitro ovary rescue was attempted 5 days after pollination in intraspecific 2x × 4x crosses of P. almum, P. quadrifarium, P. intermedium and P. rufum. The method was useful to recover some triploid BII hybrids in P. almum (success rate: 0.49%) and in P. rufum (0.59%), but failed in P. intermedium and P. quadrifarium. Pollen tube growth was usually inhibited at the stigma or style levels after self-pollination in 2x plants, confirming that diploids are self-incompatible. Pollen of 4x cytotypes germinated and penetrated the pistils of diploid conspecific cytotypes. This indicated that no incompatibility system exists in these species to keep the 2x cytotypes from hybridising with 4x conspecific cytotypes as pollen donors. However, after pollination of 2x cytotypes with pollen of 4x counterparts, most ovules showed embryo and endosperm development, but a few days later, endosperms collapsed and embryos stopped their development. As a result of these processes, sexual self-incompatible 2x cytotypes of Paspalum species produced very few triploid hybrids when pollinated with pollen of their apomictic 4x counterparts. Thus, the low diploid-tetraploid crossability was due to the existence of a post-zygotic abortive system and not caused by pre-fertilisation barriers.

Review Lecture Self-incompatibility: phenomenology and physiology

1983 ◽  
Vol 218 (1213) ◽  
pp. 371-395 ◽  
Keyword(s):  
Pollen Tube ◽  
Plant Breeding ◽  
Pollen Tube Growth ◽  
Tube Growth ◽  
Cellular Interaction ◽  
Self Incompatibility ◽  
Intrinsic Interest ◽  
Incompatible Pollen ◽  
Inhibition Reaction ◽  
Made In

Angiosperm self-incompatibility systems have been attracting increasing attention in recent years, both because of their importance in practical plant breeding and in acknowledgement of their considerable intrinsic interest as examples of cellular interaction and recognition. Progress has been made in analysing the genetics of complex multi-locus systems in certain primitive families, and the inhibition reaction itself has been more fully characterized in certain species. The review deals mainly with homomorphic, gametophytic self-incompatibility systems, concentrating on aspects of pollen-tube growth and pistil function that appear to play key roles in the discrimination between compatible and incompatible pollen. Various implications of a recently proposed hypothesis concerning the operation of gametophytic systems are also discussed.

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