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Titolo:
Effects of seed ageing on early post-germination root extension in maize: a spatial and histological analysis of the growth-zone
Autore:
Bingham, IJ; Merritt, GJ;
Indirizzi:
SAC, Crop Hlth Dept, Aberdeen AB21 9YA, Scotland SAC Aberdeen Scotland AB21 9YA op Hlth Dept, Aberdeen AB21 9YA, Scotland
Titolo Testata:
SEED SCIENCE AND TECHNOLOGY
fascicolo: 1, volume: 27, anno: 1999,
pagine: 151 - 162
SICI:
0251-0952(1999)27:1<151:EOSAOE>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
LOW WATER POTENTIALS; CELL EXPANSION; MERISTEM; TURGOR;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
25
Recensione:
Indirizzi per estratti:
Indirizzo: Bingham, IJ SAC, Crop Hlth Dept, Ferguson Bldg,Craibstone Estate, AberdeenAB21 9YA, Scotland SAC Ferguson Bldg,Craibstone Estate Aberdeen Scotland AB21 9YA
Citazione:
I.J. Bingham e G.J. Merritt, "Effects of seed ageing on early post-germination root extension in maize: a spatial and histological analysis of the growth-zone", SEED SCI T, 27(1), 1999, pp. 151-162

Abstract

The effects of deterioration of maize (Zea mays L. cv Jubilee) seed on thespatial distribution of root growth, and its cellular basis, was investigated. Seed (caryopses) of maize were artificially aged at 45 degrees C and 18% seed moisture content for 30 h. This regime reduced seed vigour, but hadonly a small effect on the final % germination. All experiments on root growth were conducted between 72 and 75 h after imbibition using cohorts of aged and unaged seed which germinated between 24 and 48 h. Seed ageing reduced the extension rate of primary roots by 31%. Marking experiments revealedthat this was the result of a lower maximum relative elemental growth rate, a premature deceleration in rate and a shorter growth-zone. Cell proliferation in the cortex was examined. Ageing reduced the mitotic index throughout the meristem, which was slightly smaller compared to controls. Cell doubling time was increased by ageing, indicating a slower rate of cell production. The profiles of cortical cell length were comparable for roots from aged and unaged seed over the apical 5 nun, but mature cell length was reduced, suggesting that effects of ageing on cell expansion were greater than those on cell division.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/11/20 alle ore 16:29:31