Tomato pollen tube development and carbohydrate fluctuations in the autotrophic phase of growth

• Autorzy: Carrizo Garcia C. , Guarnieri M. , Pacini E.
• Języki publikacji: EN

Abstrakty

EN

Ripe pollen has different soluble and insoluble carbohydrates in variable amounts. Pollen germination and pollen tube growth were studied in a tomato cultivar (Solanum lycopersicum L. cv. Platense) with atypical pollen among tomatoes due to its very low amount or absence of sucrose. In vitro assays were performed using a culture medium without carbohydrates to explore whether there is an autotrophic phase of pollen tube growth, and if there is, describe it, and to analyze the fluctuations of endogenous carbohydrates (soluble carbohydrates, starch, pectins, and callose). Pollen germination was fast (ca. 10 min) and a definite autotrophic phase was observed. Soluble carbohydrates and pectins showed the most substantial changes during this period, even after 10 min. A small amount of callose was observed in the ripe pollen and pollen tubes. Pectins were the most abundant pollen tube wall component. Pollen can be considered starchless; starch was not involved in the autotrophic phase of growth. Other types of substances must be connected with the carbohydrate metabolism, because the fluctuations of the different substances did not follow balanced stoichiometric relationships. Pollen germination and pollen tube elongation was sustained autotrophically, even though sucrose was absent and starch was negligible in pollen grains. The type of pollen reserves and the fast pollen tube formation could be selective advantages in this cultivar.

• Wydawca: -
• Czasopismo: Acta Physiologiae Plantarum
• Rocznik: 2012
• Tom: 34
• Numer: 6
• Opis fizyczny: p.2341-2347,fig.,ref.

Twórcy

autor

Carrizo Garcia C.

• Instituto Multidisciplinario de Biologia Vegetal (CONICET-UNC), CC 495, CP 5000, Cordoba, Argentina

autor

Guarnieri M.

• Department of Environmental Sciences, Siena University, Via P.A. Mattioli 4, 53100 Siena, Italy

autor

Pacini E.

• Department of Environmental Sciences, Siena University, Via P.A. Mattioli 4, 53100 Siena, Italy

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