Effects of water deficit on the relative water content, proline accumulation and injury of cell membranes in leaves of old and modern cultivars of winter wheat

• Autorzy: Bandurska H. , Gorny A.G. , Zielezinska M.

Warianty tytułu

PL

Wpływ deficytu wody na względną zawartość wody, akumulację wolnej proliny oraz uszkodzenie błon komórkowych w liściach starych i nowoczesnych odmian pszenicy ozimej

• Języki publikacji: EN

Abstrakty

EN

Genotype-dependent variation in water stress-induced tissue dehydration (RWC), proline accumulation (PA), membrane injury (MI) and stress resistance (R) was studied among old and modern cultivars of winter wheat (Triticum aestivum L.). Twenty-day- old seedlings grown in nutrient solution were subjected to a moderate water stress (-0.75 MPa) by immersing (for 72 h) their root systems in aerated nutrient solution with the addition of polyethylene glycol (PEG 6000). Both cultivar groups tended to exhibit a different responsibility to the moderate stress. Water deficit induced reductions in the water content of leaves in five out of nine modern cultivars only and in these cultivars an increased accumulation of free proline was found. The highest, about 100-fold increase in PA was noticed in the modern cvs Emika and Finezja. The highest MI (≈ 12%) had the modern cv. Finezja. The leaf PA under stress positively correlated with MI, but both characteristics showed negative correlations with RWC. Only weak and insignificant relationships between leaf characteristics and stress resistance were observed. The results suggest that none of the individual measured physiological parameters would indirectly serve as a precise indicator for drought resistance in the studied wheat collection.

PL

Badano różnice genotypowe w reagowaniu na deficyt wody pomiędzy starymi i nowoczesnymi odmianami pszenicy ozimej (Triticum aestivum L.) na podstawie pomiaru uwodnienia liści (RWC), akumulacji wolnej proliny (PA), uszkodzenia błon komórkowych (MI) oraz wskaźnika odporności na stres (R). Dwudziestodniowe siewki pszenicy poddano działaniu umiarkowanego deficytu wody (-0,75 MPa) poprzez zanurzenie korzeni w roztworze pożywki z dodatkiem glikolu polietylenowego (PEG 6000). Badane grupy odmian charakteryzowały się inną reakcją na zastosowany czynnik stresowy. Deficyt wody przyczynił się do obniżenia zawartości wody w liściach pięciu z siedmiu nowoczesnych odmian pszenicy i u tych odmian nastąpił też znaczny wzrost poziomu wolnej proliny. Największy, około 100-krotny wzrost poziomu proliny stwierdzono u odmian Emika i Finezja. Nowoczesna odmiana Finezja charakteryzowała się też największym (MI ≈ 12%) uszkodzeniem błon komórkowych. Stwierdzono pozytywną korelację pomiędzy akumulacją wolnej proliny w liściach a uszkodzeniem błon komórkowych (MI) oraz negatywną korelację tych cech z uwodnieniem liści (RWC). Korelacje między tymi cechami liści a poziomem odporności na stres były słabe i nieistotne. Wyniki sugerują, że żaden z badanych parametrów fizjologicznych liści nie był precyzyjnym wskaźnikiem poziomu odporności na suszę analizowanej kolekcji pszenicy.

Słowa kluczowe

EN

genotypic variation; membrane injury; proline; water; stress; winter wheat; wheat; water deficit; water content; proline accumulation; cell membrane; leaf; old cultivar; modern cultivar; plant adaptation; climate condition; soil condition; growth phase; water stress; parameter measurement

• Wydawca: -
• Czasopismo: Zeszyty Problemowe Postępów Nauk Rolniczych
• Rocznik: 2008
• Tom: 524
• Opis fizyczny: p.115-126,fig.,ref.

Twórcy

autor

Bandurska H.

• Department of Plant Physiology, Agricultural University, Wołynska 35, 60-637 Poznan, Poland

autor

Gorny A.G.

autor

Zielezinska M.

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