The Effects of Genotype and Ploidy Level on Pollen Surface Sculpturing in Maize (Zea Mays L.)

Southworth, Darlene; Pfahler, P. L.

doi:10.1002/j.1537-2197.1992.tb13752.x

Cited by 7 publications

(6 citation statements)

References 13 publications

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“…The ploidy level and genotypes of both the gametophyte and the sporophyte in which the pollen grains are formed determine the size of the pollens (Ottaviano and Mulcahy 1989;Southworth and Pfahler 1992;Katsiotis and Forsberg 1995b). Our research on 15 oat accessions showed a statistically significant correlation between ploidy and the length of pollen grains.…”

Section: Discussionmentioning

confidence: 51%

Variability in the quality of pollen grains in oat amphiploids and their parental species

Tomaszewska

Kosina

2022

Braz. J. Bot

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The pollen analysis has become an important technique to evaluate the use of selectively breeding crops, including the three most important grasses to human nutrition. This study aimed to evaluate the reproductive potential of oat species and their hybrid progeny (amphiploids) during three consecutive vegetation seasons. Correlation and regression analyses were used to describe the morphotypes and viability of pollen grains, while numerical taxonomy methods were applied to analyse the relationships between taxa. The results indicated a difference in the size of pollen grains between the growing seasons, but a stable association between the taxa. The viability of pollen grains showed no correlation with pollen length. In the ordination space, amphiploids and parental species were well discriminated. Amphiploids and parental species were characterised by a positive correlation between the pollen size and the level of ploidy; however, along the respective regression line, the amphiploids were located among species with a high level of ploidy. Developmental anomalies of pollen grains were more frequent in amphiploids, with few pollen grains being chromosomally imbalanced, and the formation of micrograins was the most common event. Multiporate pollens being of multiple-spindle mother cells origin can be equivalents of four monoporate microspores. A strong correlation was observed between the frequencies of multiporate grains and micropollens. In the ordination space, monoporate types (species) were discriminated from multiporate types (amphiploids). High viability of pollen in amphiploids proved their genomic/chromosomal stabilisation across many generations of reproduction.

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Section: Discussionmentioning

confidence: 51%

Variability in the quality of pollen grains in oat amphiploids and their parental species

Tomaszewska

Kosina

2022

Braz. J. Bot

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“…It is well known that cell volume increases with increasing DNA content, which may, in turn, influence pollen diameter (Tan & Dunn, 1973;Lewis, 1980;Tal, 1980;Pundir, Rao & Van Der Maesen, 1983;Fagerberg, Davis & Matthews, 1990;Van Dijk & Van Delden, 1990;Bamberg & Hanneman, 1991;Berdahl & Barker, 1991;Humbert-Droz & Felber, 1992;Southworth & Pfahler, 1992;Jansen & Den Nijs, 1993). Becauseof the relatively close correlation between 'giant, big' pollen and 2n status (Orjeda, Freyre & Iwanaga, 1990;Veronesi, Tavoletti & Mariani, 1990;Maceira et al, 1992), the presence of giant grains has frequently been used as an indication of the production of 2n pollen (Den Nijs & Peloquin, 1977a, b;Vorsa & Bingham, 1979;Camadro & Peloquin, 1980;McCoy, 1982;Ramanna, 1983;Den Nijs & Stephenson, 1988;Van Santen, 1988;Veronesi, Mariani & Tavoletti, 1988;Den Nijs & Winkelhorst, 1989;Sala et al, 1989;Van Tuyl et al.…”

Section: Morphological Screening To Detect 2n Pollenmentioning

confidence: 99%

Gametes with the somatic chromosome number: mechanisms of their formation and role in the evolution of autopolyploid plants

1995

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summary The production of 2n gametes in plants, i.e. gametes with a somatic chromosome number, is considered to be the dominant process involved in the origin of polyploid plants. In this review, we provide a synthesis of current knowledge concerning the production of 2n gametes. Firstly, we describe the different methods used to detect and quantify the production of 2n gametes in plants, which include morphological and flow cytometry screening of the occurrence of 2n pollen, the analysis of crosses among diploid and tetraploid parents and the instigation of micro‐and mega‐sporogenesis. Secondly, the high level of inter‐ and infra‐specific variation in 2n gametes production is described. Thirdly, the various cytological anomalies responsible for the production of 2n gametes are reviewed, with particular reference to the relative genetic consequences of the first and second restitution divisions that give rise to 2n gametes. Fourthly, the significance of 2n gametes in crop plant improvement is discussed, in relation to somatic chromosome doubling to obtain new polyploid varieties. In particular, we compare the genetic and yield consequences of methods based on unilateral and bilateral sexual polyploidization. Finally, we outline how knowledge of the variety of mechanisms involved in 2n gamete production have increased our understanding of the evolutionary significance of polyploidy and the population biology of polyploid plants.

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“…In relation to size differences of pollen grains, chromosome data should also be analysed, since larger pollen grains are often a result of polyploidy, following the tenet that polyploidy generates larger cells and therefore larger pollen grains (Bronckers, 1963;Stebbins, 1971;Muller, 1979;Southworth & Pfahler, 1992). A detailed chromosome survey of Palaua is still wanting; however, preliminary data (Schneider & Huertas, unpubl.…”

Section: Infrageneric Variability and Taxonomic Utilitymentioning

confidence: 99%

Infrageneric variability of pollen morphology in Palaua (Malveae, Malvaceae) and the taxonomic utility of quantitative pollen characters

Schneider

Klie

Kacza

et al. 2009

Grana

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The Effects of Genotype and Ploidy Level on Pollen Surface Sculpturing in Maize (Zea Mays L.)

Cited by 7 publications

References 13 publications

Variability in the quality of pollen grains in oat amphiploids and their parental species

Variability in the quality of pollen grains in oat amphiploids and their parental species

Gametes with the somatic chromosome number: mechanisms of their formation and role in the evolution of autopolyploid plants

Infrageneric variability of pollen morphology in Palaua (Malveae, Malvaceae) and the taxonomic utility of quantitative pollen characters

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