Changes in lipids and polysaccharides during pollen ontogeny in Oenothera anthers

Halac, Inés Noher de; Fama, Giampaolo; Cismondi, Inés Adriana

doi:10.1007/bf00194869

Cited by 24 publications

(13 citation statements)

References 27 publications

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“…In different species (Keijzer 1987;Noher de Halac et al 1992) the processes were similar to those described here for D. racinae, T. aeranthos and A. recurvata, although the time at which they occur is similar only for the first two species. In A. recurvata the same processes occurs relatively late.…”

Section: Resultssupporting

confidence: 74%

“…It was described that in Tillandsia pallidoflavens (Hess 1991) and in Lilium henryi (Dickinson 1981), the plastids in the archesporial cells accumulate polysaccharides. In Smilax aspera (Pacini & Franchi 1983), in Lilium longiflorum (Miki-Hirosige & Nakamura 1983) and in Oenothera hookeri (Noher de Halac et al 1992), the occurrence of starch grains in the microspore mother cells was described. An analysis of the literature showed that there is variability in this aspect, including species of a same genus as in Lilium (Dickinson 1981;Clément et al 1994).…”

Section: Resultsmentioning

confidence: 99%

“…There is a close correlation between different stages of cell and tissue development in the anthers and mobilization of nutrients with the events of amylogenesis and amylolysis (Hess 1991;Noher de Halac et al 1992;Pacini & Viegi 1995;Clément et al 1998;Konyar et al 2013).…”

Section: Introductionmentioning

confidence: 99%

“…The accumulation of information on the dynamics of sugars and starch has consistently increased embryological knowledge, besides the traditional aspects of the differentiation of reproductive cells studied by means of sporogenesis and gametogenesis (Baker & Baker 1979, 1983; Miki-Hirosige & Nakamura 1983; Noher de Halac et al 1992;Clément et al 1994;Franchi et al 1996). Thus, some patterns of sugars and starch dynamics are widely disseminated among the angiosperms.…”

Section: Introductionmentioning

confidence: 99%

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Starch distribution in anthers, microspores and pollen grains in Aechmea recurvata (Klotzsch.) L.B.Sm., Dyckia racinae L.B.Sm. and Tillandsia aeranthos (Loisel.) L.B.Sm. (Bromeliaceae)

et al. 2015

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This paper presents a comparative description of the starch distribution in the anthers, microspores and pollen grains of Aechmea recurvata, Dyckia racinae and Tillandsia aeranthos. Flowers at different stages of development were processed according to plant microtechniques for observation by light microscope. Ten stages of embryological development were used as references for the comparative analysis of starch distribution and dynamics. The structural data showed a greater starch accumulation in the parietal layers and connective of D. racinae. It was observed that in the species studied, starch began to accumulate in microspore mother cell stage. The pollen grains in D. racinae and in T. aeranthos present two amylo genesis-amylolysis cycles, while A. recurvata presents only one. One amylogenesis-amylolysis cycle occurs in the parietal layers and/or connective tissue in all three species. The pollen grains in the three species are dispersed without starch and are characterized as the starchless type. Starch dynamics presents a close relation to the development of sporangia, microspores and pollen grains. It is believed that differences in the starch distribution and accumulation are related to the abiotic factors where the species are found. IntroductionThe effectiveness of the reproductive process in angiosperms depends on the viability of microspores, megaspores, pollen grains and embryo sac, where the dynamics and use of primary metabolites are essential in this process (Bhandari 1984;Delph et al. 1997;Shivanna 2003;Pacini et al. 2006;Konyar et al. 2013). The accumulation and mobilization of sugars, lipids and proteins are common during sporangia development and were demonstrated by microscopy, histochemistry, and biochemical, physiological and molecular assays (Pacini & Viegi 1995;Oliver et al. 2005;Lora et al. 2012;Konyar et al. 2013). Regarding to the sugars, their importance was demonstrated for maturation of the epidermis, endothecium and tapetum (Clément & Audran 1995;Clément et al. 1998;Castro & Clément 2007). In this subject, was also demonstrated that the middle layers also act in the access of sugars to the loculus (Clément & Audran 1995).Besides to supply the metabolic demand, sugars will compose the fibrous thickenings of the endothecium, the primexine and intine, and in some cases, also the exine (Walter & Doyle 1975;Horner & Pearson 1978). When preparing for the developmental events of pollen grains, including the pollination period, sugars can be accumulated as starch, callose, pectins, insoluble polysaccharides, disaccharides or monosaccharides (Pacini 1996;Aouali et al. 2001;Clément & Pacini 2001;Pacini et al. 2006). The starch acts on the metabolism or has a structural function (Pacini 1996). In metabolism, starch can be emphasized as an intermediate stage in the formation of oils in starchlesstype pollen grains (Miki-Hirosige & Nakamura 1983;Baker & Baker 1979). It may be possible for it to convert into sucrose for breathing and osmotic regulation (MikiHirosige & Nakamura 1983), o...

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Section: Resultssupporting

confidence: 74%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Starch distribution in anthers, microspores and pollen grains in Aechmea recurvata (Klotzsch.) L.B.Sm., Dyckia racinae L.B.Sm. and Tillandsia aeranthos (Loisel.) L.B.Sm. (Bromeliaceae)

et al. 2015

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“…Monocots such as Tilloridsin pnllirloflnvescetis (Hess 1991), Ophtys liiren (Feijo & Pais 1988). L d i r i t r~ pereririe (Pacini et al 1992a) and Pterostylis plirriiosn (Pandolfi et al 1993) have only one stage of differentiation, more precisely amylogenesis, during development, whereas species such as Sri~ilnr aspern, have three amylogeneses (Pacini & Franchi 1983 , whereas Oerrotliera liookeri has only one (Noher de Halac et al 1992). Irrespective of the number of amylogeneses, mature pollen grains may or may not contain starch ; moreover, in species such as Pnrietarirr jrmdnicn, the percentage of grains containing starch varies in relation to the season (Franchi et al 1984).…”

mentioning

confidence: 99%