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Titolo:
A COMPARATIVE-STUDY OF RADICLE AND COLEOPTILE EXTENSION IN MAIZE SEEDLINGS FROM AGED AND UNAGED SEED
Autore:
BINGHAM IJ; HARRIS A; MACDONALD L;
Indirizzi:
SAC ABERDEEN,DEPT CROP BIOL,581 KING ST ABERDEEN AB9 1UD SCOTLAND
Titolo Testata:
Seed science and technology
fascicolo: 1, volume: 22, anno: 1994,
pagine: 127 - 139
SICI:
0251-0952(1994)22:1<127:ACORAC>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
NO
Recensione:
Indirizzi per estratti:
Citazione:
I.J. Bingham et al., "A COMPARATIVE-STUDY OF RADICLE AND COLEOPTILE EXTENSION IN MAIZE SEEDLINGS FROM AGED AND UNAGED SEED", Seed science and technology, 22(1), 1994, pp. 127-139

Abstract

Effects of ageing maize (cv. Concorde) seed on the time of germination and rate of coleoptile and radicle extension were separated by measuring extension on cohorts of aged and unaged seedlings which germinated at the same time. Seeds were aged for different periods at 45 degrees C and 20 or 22% moisture content. The rate of radicle and coleoptileextension was more sensitive to ageing than germination; all ageing treatments reduced the extension rate of coleoptiles and radicles, but only the longer treatments influenced germination significantly. Ratesof radicle extension were reduced to a greater extent than those of coleoptiles; effects were maintained over the whole course of the experiment (three to four days after germination) and were independent of the size of the radicle. The reduction in rate of radicle extension wasnot confined to the conditions used in a standard germination tear; asimilar response was observed when seedlings were grown in CaCl2 and a full balanced nutrient solution. Furthermore, ageing had no consistent effect on the ethanol-soluble sugar content of root tips from thesesolution-grown plants. Together the data suggest that mobilization ofcarbohydrate reserves and provision of osmotica for cell expansion does not limit growth in radicles from aged seed.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/11/20 alle ore 16:53:35