Effect of heat stress during seed development and maturation on wheat (Triticum durum) seed quality. II. Mitochondrial respiration and nucleotide pools during early germination

Autor:	J. S. Burris, L. Grass
Rok vydání:	1995
Předmět:	chemistry.chemical_classification food and beverages Embryo Plant Science Horticulture Meristem Biology Mitochondrion chemistry.chemical_compound chemistry Anthesis Germination Botany Radicle Nucleotide Agronomy and Crop Science Adenosine triphosphate
Zdroj:	Canadian Journal of Plant Science. 75:831-839
ISSN:	1918-1833 0008-4220
DOI:	10.4141/cjps95-139
Popis:	Marzak and Oum-rabia wheat seeds were produced under three temperature regimes (20:15, 28:21, 36:29 °C) starting 10 d after anthesis through harvest. Nucleotide levels and respiratory activity of mitochondria isolated from imbibing embryos were determined. Mitochondrial structure from the radicle meristem region of imbibed embryos was examined under electron microscopy. Embryos from low-temperature treatments showed rapid accumulation of adenosine triphosphate (ATP) and higher energy levels and rates of oxygen uptake than embryos from high-temperature treatments. Embryos from medium-temperature treatments exhibited intermediate values. Parallel to these metabolic changes during early seed germination, results from electron microscopy revealed visible differences in mitochondrial structure. Mitochondria from the low-temperature regime were well developed with visible membranes and cristae; those from the high-temperature regime were degenerating. These results provide clear evidence of the influence of parent temperature conditions on the seed metabolism during early stages of germination. Key words: Embryo, mitochondria, nucleotide, oxygen uptake, vigor, wheat
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::487c13bdea444a0b89b1071fe888b45c https://doi.org/10.4141/cjps95-139 Zobrazit plný text záznamu