Madden, R.F. and Burris, J.S. (1995) Respiration and mitochondrial characteristics of imbibing maize embryos damaged by high temperatures during desiccation. Crop Science, 35 (6). pp. 1661-1667.
![[img]](http://eprints.icrisat.ac.in/style/images/fileicons/application_pdf.png)
|
PDF
| Preview |
Abstract
Hybrid maize (Zea mays) seed artificially dried to 120 g H2O/kg seed in air temperatures of either 35 (LT) or 45°C (HT) was used to study the effect of desiccation temperature on mitochondrial function during early imbibition. In embryo culture experiments, embryo growth was delayed for embryos excised from HT treated seed compared with LT samples. After 1 h of imbibition, the rate of O2 uptake by LT axis tissue was greater than for HT dried samples. Uptake rates continued to increase for LT samples through the first 6 h of imbibition while rates for HT axes remained constant. Mitochondria isolated from LT axis tissue that had undergone imbibition for 4 h exhibited respiratory control with oxidative phosphorylation efficiency values of 0.79 and 0.77 for NADH and succinate assays, respectively. Mitochondria from imbibing HT axis tissue exhibited no respiratory control. Electron micrographs of cells from the radicle meristem region of both treatments showed that mitochondrial development during the initial 24 h of imbibition was impaired in HT samples. It is suggested that mitochondrial function and development, during the initial stages of embryonic tissue hydration, is impaired when maize seeds are artificially dried with high air temperatures. It is concluded that the development of mitochondrial function during this period is a key element in determining the rate of germination and subsequent seedling growth.
| Item Type: | Article |
|---|---|
| Author Affiliation: | Northrup King Seeds, Hampton, IA 50441, USA |
| Subjects: | Plant Physiology and Biochemistry > Plant Physiology Plant Physiology and Biochemistry > Biochemistry |
| Divisions: | Maize |
| Depositing User: | Sandhya Gir |
| Date Deposited: | 14 Oct 2010 08:51 |
| Last Modified: | 14 Oct 2010 08:51 |
| Official URL: | https://www.crops.org/publications/cs/abstracts/35... |
| URI: | http://eprints.icrisat.ac.in/id/eprint/20 |
Actions (login required)
 |
View Item |
