TY - JOUR

T1 - Iron-deficiency responses in cereal seedlings

AU - Bityutskii, Nikolai P.

PY - 2007/9

Y1 - 2007/9

N2 - Acidity release as a characteristic of iron (Fe) deficiency stress responses was investigated during early seedling establishment of maize (Zea mays L.), barley (Hordeum vulgare L.), winter wheat (Triticum aestivum L.), and winter rye (Secale cereale L.). Ferric reduction as another characteristic of Fe deficiency stress responses was also investigated in maize. This has previously been considered a process only occurring in iron-stressed dicotyledonous plants. Measurements were made of the Fe efflux from maize endosperm under Fe-deficient and non-limiting conditions. The scutellum of Fe-stressed cereal seedlings (all species investigated) increased agar acidification by 30-40%, while manganese (Mn) or zinc (Zn) stressed seedlings did not demonstrate this reaction. Among the maize genotypes studied ('VIR-7569' and 'VIR-7882'), the Fe-stressed acid release was more prolonged in relatively less Fe-efficient cv. 'VIR-7569.' In maize, the induced enhancement of acid release was accompanied by an increase in Fe efflux from endosperm. Conversely, maize scutellum Fe3 +-reductase activity was not deficiency-dependent on Fe, indicating that enhanced acidity release is a biological phenomenon facilitating Fe supply at early development of graminaceous plants. In cereal seedlings, the coexistence of two marker responses to Fe-deficiency (Strategy I and Strategy II), which are usually typical of different taxonomic groups (dicotyledonous and graminaceous plants) can be regarded as evidence in favour of the hypothesis of common genesis in dicotyledonous and graminaceous plants.

AB - Acidity release as a characteristic of iron (Fe) deficiency stress responses was investigated during early seedling establishment of maize (Zea mays L.), barley (Hordeum vulgare L.), winter wheat (Triticum aestivum L.), and winter rye (Secale cereale L.). Ferric reduction as another characteristic of Fe deficiency stress responses was also investigated in maize. This has previously been considered a process only occurring in iron-stressed dicotyledonous plants. Measurements were made of the Fe efflux from maize endosperm under Fe-deficient and non-limiting conditions. The scutellum of Fe-stressed cereal seedlings (all species investigated) increased agar acidification by 30-40%, while manganese (Mn) or zinc (Zn) stressed seedlings did not demonstrate this reaction. Among the maize genotypes studied ('VIR-7569' and 'VIR-7882'), the Fe-stressed acid release was more prolonged in relatively less Fe-efficient cv. 'VIR-7569.' In maize, the induced enhancement of acid release was accompanied by an increase in Fe efflux from endosperm. Conversely, maize scutellum Fe3 +-reductase activity was not deficiency-dependent on Fe, indicating that enhanced acidity release is a biological phenomenon facilitating Fe supply at early development of graminaceous plants. In cereal seedlings, the coexistence of two marker responses to Fe-deficiency (Strategy I and Strategy II), which are usually typical of different taxonomic groups (dicotyledonous and graminaceous plants) can be regarded as evidence in favour of the hypothesis of common genesis in dicotyledonous and graminaceous plants.

KW - Barley

KW - Grain

KW - Iron stress response

KW - Maize

KW - Scutellum

KW - Seedling

KW - Winter rye

KW - Winter wheat

UR - http://www.scopus.com/inward/record.url?scp=34548831716&partnerID=8YFLogxK

U2 - 10.1080/01904160701555788

DO - 10.1080/01904160701555788

M3 - Article

AN - SCOPUS:34548831716

VL - 30

SP - 1483

EP - 1498

JO - Journal of Plant Nutrition

JF - Journal of Plant Nutrition

SN - 0190-4167

IS - 9

ER -