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Titolo:
Ovary abscisic acid concentration does not induce kernel abortion in field-grown maize subjected to drought
Autore:
Asch, F; Andersen, MN; Jensen, CR; Mogensen, VO;
Indirizzi:
Royal Vet & Agr Univ, Dept Agr Sci, DK-2630 Tastrup, Denmark Royal Vet & Agr Univ Tastrup Denmark DK-2630 i, DK-2630 Tastrup, Denmark Danish Inst Agr Sci, Res Ctr Foulum, Dept Crop Physiol & Soil Sci, DK-8830Tjele, Denmark Danish Inst Agr Sci Tjele Denmark DK-8830 oil Sci, DK-8830Tjele, Denmark
Titolo Testata:
EUROPEAN JOURNAL OF AGRONOMY
fascicolo: 2, volume: 15, anno: 2001,
pagine: 119 - 129
SICI:
1161-0301(200110)15:2<119:OAACDN>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
WATER-DEFICIT; TROPICAL MAIZE; STRESSED WHEAT; CELL-DIVISION; SOIL; ROOT; POTENTIALS; ENDOSPERM; RESPONSES; SIGNALS;
Keywords:
drought-stress; field trial; abscisic acid; reproductive stage; Zea mays;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
38
Recensione:
Indirizzi per estratti:
Indirizzo: Asch, F Royal Vet & Agr Univ, Dept Agr Sci, Agrovej 10, DK-2630 Tastrup, Denmark Royal Vet & Agr Univ Agrovej 10 Tastrup Denmark DK-2630 , Denmark
Citazione:
F. Asch et al., "Ovary abscisic acid concentration does not induce kernel abortion in field-grown maize subjected to drought", EUR J AGRON, 15(2), 2001, pp. 119-129

Abstract

This study investigated the effects of drought of different duration and severity on ovary abscisic acid (ABA) concentration and yield components in field-grown maize (Zea mays L. cv. Loft). The studs was conducted in a field lysimeter of the Royal Veterinary and Agricultural University (KVL) in Hojbakkegaard (55 degrees 40'N; 12 degrees 18'E 28 masl), Denmark in 1997. Irrigation was withheld at four different dates to induce drought of different duration and severity at the reproductive stage of the plants. Plots werere-watered shortly after silking and kept at field capacity for the remainder of the season. Soil water status, plant height, and early morning leaf water potential were monitored during the treatment. Ovary ABA concentration was determined at four dates before and after fertilization. Final grain yield, total DM, harvest index (HI), mean kernel weight, kernel weight distribution, and kernel number per cob were determined at maturity. Plant height was significantly (P < 0.05) reduced by 40 and 25%, respectively, in thetwo most severe drought treatments. In the two shorter drought treatments no effect of drought stress on plant height or biomass was observed. Leaf water potential decreased slowly as a function of relative available soil water content and resulted in - 0.4 MPa at the end of the longest and - 0.12 MPa at the end of the shortest stress period. Under fully watered conditions, plot yields averaged 1400 g m(-2) for total dry matter (DM) and 700 g m(-2) for grain yield, with a HI of about 0.5. Initiation of a drying cycle close to flowering did not change yields. Long drying cycles resulted in significant (P < 0.05) yield reductions up to 70% of the fully watered controls. Kernel number per cob was reduced up to 60% under long drought conditions and not affected under short-term drought. Drought imposed about two weeks prior to fertilization resulted in 30% reduction in kernel number per cob, but this effect was balanced by an increase of 25% in mean kernel weight. Long and severe drought increased ovary ABA concentration prior to fertilization, whereas short-term drought did not. At fertilization no increase ofovary ABA as compared to fully watered controls was found in any treatment. It is concluded that drought induced grain yield losses in field grown maize cannot be attributed to kernel size reduction or kernel abortion due toovary ABA concentrations as reported by some authors for studies on maize and wheat under controlled conditions, as ovary ABA concentrations peaked before zygote formation and endosperm development. (C) 2001 Elsevier ScienceB.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/01/20 alle ore 20:53:21