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Chilling injury in germinating seeds: basic mechanisms and agricultural implications

Published online by Cambridge University Press:  19 September 2008

Seema Bedi  and
Amarjit Singh Basra
Seema Bedi
Affiliation:
Department of Agronomy, Punjab Agricultural University, Ludhiana-141 004, India
Amarjit Singh Basra*
Affiliation:
Department of Botany, Punjab Agricultural University, Ludhiana-141 004, India
*
* Correspondence
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Abstract

Germinating seeds of many species, especially those of tropical or subtropical origin, suffer chilling injury when exposed to low but non-freezing temperatures, resulting in poor seedling establishment and reduction in yield. The severity of injury depends upon several factors such as (i) the species or the cultivars involved, (ii) the initial water content of the seed, (iii) the temperature to which seed is exposed, (iv) the duration of chilling exposure and (v) the period during the course of germination when the chilling exposure takes place. The period of imbibition by seeds is the period of sensitivity to the stresses but especially to chilling temperatures. Imbibitional chilling injury is defined as sensitivity to a combination of low seed-water content and imbibition at cold temperature. The mechanism of chilling injury in seeds is different from chilling injury of hydrated tissues and is discussed in relation to the involvement of membranes, respiration, rate of hydration and the concept of discreet moisture levels. Furthermore, the mechanistic and applied aspects of pre-sowing seed treatments for improved germination performance under chilling stress are discussed with an emphasis on hydration-dehydration, osmotic priming and growth regulator treatments.

Keywords

Chillinggerminationgrowth regulatorsmembranesosmotic primingrespirationseeds
Type
Review Articles
Information
Seed Science Research , Volume 3 , Issue 4 , December 1993 , pp. 219 - 229
Copyright
Copyright © Cambridge University Press 1993

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