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• Study on the cold tolerance of maize (Zea mays L.) inbred lines in Phytotron

  41-45

  Eszter Csepregi-Heilmann

  Ágnes Áldott-Sipos

  Anita Mészáros

  Anett Klaudia Kovács

  Tamás Spitko

  Csaba Szőke

  János Pintér

  Tamás Berzy

  Adrienn Széles

  Csaba L. Marton

  Views:

  49

  Maize has come a long way from the tropics to the temperate zone. In the beginning, the spreading of maize was prevented by its sensitivity to cold. Improved cold tolerance at germination is one of the most important conditions for early sowing. The advantage of cold tolerant hybrids is that they can be sown earlier, allowing longer growing seasons and higher yields, due to the fact that the most sensitive period in terms of water requirements, flowering, takes place earlier, i.e. before the onset of summer drought and heat.

  In Martonvásár, continuous research is carried out to improve the cold tolerance of maize. In the present experiment, the cold tolerance of 30 genetically different maize inbred lines was investigated in a Phytotron climate chamber (PGV-36). The aim of our research is to identify cold tolerant lines that can be used as parental components to produce proper cold tolerant hybrids and/or as sources of starting materials for new cold tolerant inbred lines. After observing and evaluating changes in phenological traits under cold-test, the results of the cold-tolerance traits of interest have been used to highlight several inbred lines that could be good starting materials for further research on genetic selection for cold tolerance.

• Responses of pea (Pisum sativum L.) to the rising atmospheric concentration of carbon-dioxide

  185-188

  András Tamás

  Ágnes Törő

  Tamás Rátonyi

  Endre Harsányi

  Views:

  163

  The atmospheric concentration of carbon dioxide increases from decade to decade in increasing pace. In 1957, atmospheric carbon dioxide levels were around 315 ppm, while in 2012 it amounted to 394.49 ppm concentration. In parallel, the global temperature is rising,which is projected to average 1.5–4.5 °C. The carbon dioxide concentration is a key factor – in interaction with the light – affects the plant's photosynthesis. Among the various factors significant interactions prevail: environmental factors affect - the growth and the development of plants, leaf area size and composition, the function of the photosynthetic apparatus, the duration of growing season.