Length of the lag period of germination and metabolic repair explain vigour differences in seed lots of maize (Zea mays)

Can mean germination time predict seed vigor of canola (Brassica napus L.) seed lots?

“…When seed lots deteriorate, their viability decreases and they will have a delay in germination, which is reflected in the MGT. A link between deterioration and MGT could be explained in terms of the repair hypothesis in deteriorated seeds as suggested by Matthews and Khajeh-Hosseini [4]. There is a considerable body of evidence that one of the first effects of ageing is an increase in MGT [17,18].…”

“…The major explanation for vigor differences in many species is, however, the incidence of seed ageing, which is sometimes referred to as deterioration [2,3]. Natural ageing occurs during the normal processes of harvest, transport, and seed storage [3,4]. Older maize seed had lower vigor as seen in soil emergence tests and was slower to germinate as indicated by higher mean germination time (MGT) [4].…”

“…Natural ageing occurs during the normal processes of harvest, transport, and seed storage [3,4]. Older maize seed had lower vigor as seen in soil emergence tests and was slower to germinate as indicated by higher mean germination time (MGT) [4]. Seed deterioration resulting from harvest conditions and prolonged storage is often cited as a physiological cause of differences between lots [5,6].…”

Radicle Emergence Test Estimates Predictions of Percentage Normal Seedlings in Standard Germination Tests of Aubergine (Solanum melongena L.) Seed Lots

“…Artificial ageing decreases the proportion of normal seedlings and increases solute leakage in radish and cabbage (Demir et al, 2008b). Matthews and Khajeh Hosseini (2007) have pointed out that MGT is the mean lag period, from the start of imbibition to RE. It was suggested that the length of the lag period is determined by the age of the seed and the time needed for the repair of deterioration as a result of ageing (Matthews et al, 2012).…”

“…Differences in RE rates have been attributed to the length of the delay from the start of imbibition to RE (Matthews and Khajeh-Hosseini, 2007), and this delay has been interpreted as dependent upon the time required for metabolic repair before RE. A greater delay before RE in aged seed suggests that they require more time for the repair commencement of the test, the seedlings were classified as either normal or abnormal according to International Seed Testing Association (ISTA, 2017).…”