Effects of water stress on light and dark respirations in two maize [Zea mays L.] varieties

• Autorzy: Mohammadkhani N , Heidari R.

Warianty tytułu

PL

Wplyw stresu wodnego na respiracje dwoch odmian kukurydzy [Zea mays L.] przebiegajaca w swietle i w ciemnosci

• Języki publikacji: EN

Abstrakty

EN

Water stress as the one of the important limiting factors in plant growth was applied with polyethylene glycol (PEG) 6000 in solutions of 10, 20, 30 and 40% strengths that achieve water deficit levels of -0.15, -0.49, -1.03 and -1.76 MPa, respectively. After 24 hours treatment, the roots and leaves respirations of two maize (Zea mays L.) cultivars – 704 and 301 – were determined in various concentrations of PEG 6000 in light and dark conditions. Respiration rate declined in leaves and roots with increasing PEG concentrations. Decreases of oxygen uptake in roots and leaves of 704 variety were significantly (p < 0.01) higher than 301 variety and in light conditions were significantly (p < 0.01) higher than in dark. The rate of respiration in the light was lower than in darkness and the decrease of oxygen uptake in water stress in dark conditions was lower than in light.

PL

Stres wodny jest jednym z najważniejszych czynników ograniczających wzrost roślin. W doświadczeniu zastosowano 10-, 20-, 30- i 40-procentowy roztwór glikolu polietylenowego (PEG) 6000, co pozwoliło osiągnąć warunki niedoboru wody na poziomie odpowiednio -0.15; -0.49; -1,03 i -1.76 MPa. Po upływie 24 godzin określono szybkość oddychania w korzeniach i liściach dwóch odmian kukurydzy (Zea mays L.) – 704 i 301 w różnych stężeniach PEG 6000, w świetle i w ciemności. Intensywność oddychania w liściach i korzeniach spadała wraz ze wzrostem stężenia PEG. Spadek poboru tlenu był istotnie (p < 0,01) wyższy w korzeniach i liściach odmiany 704 oraz w warunkach dostępu światła. Szybkość respiracji była mniejsza w świetle niż w ciemności, a spadek poboru tlenu w warunkach stresu wodnego niższy w ciemności niż przy dostępie światła.

• Wydawca: -
• Czasopismo: Polish Journal of Natural Sciences
• Rocznik: 2008
• Tom: 23
• Numer: 2
• Opis fizyczny: p.374-386,fig.,ref.

Twórcy

autor

Mohammadkhani N

• Urmia University, Urmia, Iran

autor

Heidari R.

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