The Biology of Seeds: Recent Research Advances - download pdf or read online
By G Nicolas, K J Bradford, D Come, H W Pritchard
This ebook offers edited and revised papers from the 7th overseas Workshop on Seeds, held in Salamanca, Spain, in could 2002. the major themes addressed comprise seed improvement, germination and dormancy, in addition to desiccation, seed ecology and seed biotechnology.
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Extra info for The Biology of Seeds: Recent Research Advances
1983; Walker-Simmons, 1987; Black, 1991). , 1990). , 1997). , 1995). , 1995). This difference in embryonic sensitivity to ABA should be an important feature for both the imposition and the expression of the different patterns of dormancy release displayed by developing grains of these two varieties. For this reason, we found it necessary to explore the origin of this different sensitivity to ABA. Although a genetic origin is quite obvious, it might also be that the presence of each type of seed coat, as described above, could be in part responsible for the different sensitivity to ABA displayed by embryos of these two varieties.
Embryos from hybrids harvested at 22 and 27 DAP presented different sensitivities to ABA depending on the seed coat type within which they had developed. Embryos from hybrids coming from crosses where Redland B2 had been used as the mother displayed a markedly lower ABA sensitivity than those coming from crosses where mother plants had been IS 9530 (Fig. 3). However, it was evident that this maternal effect does not persist beyond 27 DAP. Moreover, ABA sensitivity in embryos from the IS 9530 × Redland B2 cross was similar to that of embryos of the parental Redland B2, suggesting that high embryonic sensitivity to ABA is a recessive character.
Development, Genes and Evolution 210, 300–310. Faccio, S. and Sparvoli, F. (1988) Cytological characterization of the embryo-lethal mutant dek1 of maize. Protoplasma 144, 142–148. C. L. (1999) Barley aleurone cell death is not apoptotic: characterization of nuclease activities and DNA degradation. Plant Journal 20, 305–315. , Dumas, C. and Rogowsky, P. (1999) Novel phenotypes and developmental arrest in early embryo-specific mutants of maize. Planta 210, 1–8. , Dumas, C. and Rogowsky, P. (2000) Expression patterns of genes encoding HD-ZipIV homeo domain proteins define specific domains in maize embryos and meristems.
The Biology of Seeds: Recent Research Advances by G Nicolas, K J Bradford, D Come, H W Pritchard