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Seed respiration of sorghum [Sorghum bicolor (L.) Moench] during germination as affected by temperature and osmoconditioning

Published online by Cambridge University Press:  24 July 2007

Cristina Patanè ,
Valeria Cavallaro ,
Giovanni Avola  and
Giuseppina D'Agosta
Cristina Patanè*
Affiliation:
CNR-Istituto per i Sistemi Agricoli e Forestali del Mediterraneo (ISAFOM), Sede di Catania, str. le V. Lancia, zona Industriale-Blocco Palma I, 95121 Catania, Italy
Valeria Cavallaro
Affiliation:
CNR-Istituto per i Sistemi Agricoli e Forestali del Mediterraneo (ISAFOM), Sede di Catania, str. le V. Lancia, zona Industriale-Blocco Palma I, 95121 Catania, Italy
Giovanni Avola
Affiliation:
CNR-Istituto per i Sistemi Agricoli e Forestali del Mediterraneo (ISAFOM), Sede di Catania, str. le V. Lancia, zona Industriale-Blocco Palma I, 95121 Catania, Italy
Giuseppina D'Agosta
Affiliation:
Dipartimento di Scienze Agronomiche, Agrochimiche e delle Produzioni Animali (DACPA), Sezione Scienze Agronomiche, via Valdisavoia 5, 95123 Catania, Italy
*
*Fax +39095292870 E-mail: c.patane@isafom.cnr.it
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Abstract

Seed respiration has been utilized as an index of seed vigour and has correlated well with seedling development. We examined the respiration process as affected by temperature and osmopriming during imbibition in two cultivars of sorghum [Sorghum bicolor (L.) Moench] differing in capacity to germinate at low temperatures. Respiration of imbibing seeds was measured with a specially built apparatus linked to an infrared gas analyser. Seed respiration at the beginning of the imbibition process strictly depended on temperature (T). T also greatly affected the total CO2 respired to reach the first germination event, which significantly increased as T declined from the optimum. Osmopriming affected seed respiration differently in the two cultivars. In the cold-tolerant cultivar (Brandes), osmopriming reduced the total thermal requirements and, at T close to the minimum for germination, the energy required to achieve the first radicle protrusion. In the cold-sensitive cultivar (H128), osmopriming lowered base T for respiration and reduced the requirements for total CO2 respired, allowing germination even at 10°C. The cold-tolerant cultivar always maintained higher respiration rates than the cold-sensitive one, showing a greater capability of mobilizing energy from reserves. Germination time (i.e. GR50) related well to cumulative seed respiration down to a threshold value of cumulative CO2, after which GR50 was more affected by T than was cumulative respiration. Seed water uptake significantly slowed with decreasing T, and was accelerated by osmopriming. However, water imbibition rate influenced the start of seed respiration, but not the subsequent rate of metabolic activity preceding germination. Seed respiration was a good indicator of the activation of germinative metabolic processes, although under extreme T conditions the seed populations still respired, even if at low levels, but did not germinate rapidly or completely.

Keywords

germinationosmoprimingseed respirationSorghum bicolorsuboptimal temperatures

Information

Type
Research Analysis
Information
Seed Science Research , Volume 16 , Issue 4 , December 2006 , pp. 251 - 260
Copyright
Copyright © Cambridge University Press 2006

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