Physiology and Biochemistry of Seeds in Relation to by Dr. J. Derek Bewley, Dr. Michael Black (auth.)

By Dr. J. Derek Bewley, Dr. Michael Black (auth.)

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Additional info for Physiology and Biochemistry of Seeds in Relation to Germination: Volume 2: Viability, Dormancy, and Environmental Control

Sample text

Comparisons between deteriorated seeds which show such diversity in their final response are difficult to make, and are not necessarily worth making, particularly since the metabolic lesion(s) affecting viability might be expressed in the seedling stage in one case, but prior to the completion of germination in another. We will discriminate between the metabolism of completely non-viable seeds and those populations of deteriorated seeds exhibiting all manner of viabilities and degrees of vigour.

Since changes in the DNA can lead to impaired transcription and translation, and since germination is dependent upon these two processes, it is likely that DNA lesions playa role in viability loss. Moreover, an early event after imbibition of stored seeds might be the repair of damage to macromolecules or macromolecular structures suffered during storage. Lesions to segments of the DNA containing the genes for repair enzymes could be more deleterious than lesions to less essential DNA segments.

By combining the basic viability equations (2) and (3) they have derived a new equation which describes the relationship between the standard deviation of the distribution of seed deaths in time and the storage environment. -p 10KL I C,m CzI Improved (1) relates probit percentage viability (v), at any time (P), to any combination ofmoisture content (m) and temperature (t) in dc. Three of the constants KL (the sum of 22 Viability and Longevity log Ka plus K v), C 1 and C 2 [see basic Eqs. (2) and (3)] are specific to the species, but are independent of genotype and the quality of the seed at the beginning of storage which has resulted from the pre-storage environment.

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