Effect of temperature increase under low radiation conditions on phytochemicals and ascorbic acid in greenhouse grown broccoli

Effects of soil warming and nitrogen fertilization on leaf physiology of Pinus tabulaeformis seedlings

“…5). Schonhof et al (2007) also reported that warming stimulated the accumulation of ASA in broccoli. However, in another study, free proline content in wheat seedlings was decreased by warming (Ö ncel et al 2000).…”

On farm and fresh produce management

“…Some reports have indicated that water stress can increase accumulation of certain phytochemicals with a doubling of glucosinolate content in broccoli with reduced water supply [154]. In carrot changes in polyacetylene profile and the content of individual polyacetylenes have also shown a response to water stress, although results are contradictory.…”

“…In contrast alkyl glucosinolates such as glucoiberin and glucoraphanin showed increased accumulation at lower temperature (<12 o C). Of the indole glucosinolates glucobrassicin was increased by high temperature (>18 o C) and low radiation [82,154]. The authors found a significant correlation between alkyl glucosinolates in broccoli florets and levels of the stress indicator proline in leaves and postulate that stress responses may play a role in glucosinolate accumulation.…”

“…A number of studies carried out on broccoli and cauliflower cultivars [26,82,[154][155][156] have indicated that increasing irradiation combined with lower daily temperatures, led to increased levels of glucoraphanin and glucoiberin. In purple broccoli varieties the glucosinolate content was unaffected.…”

“…Sulphur supplementation has been demonstrated to increase glucoraphanin content in a range of Brassica species including broccoli and to increase alliin content in onion and garlic [83,154,156]. In the study of sulphur was applied at levels up to 600mg per plant to broccoli grown in soil free media and resulted in a significant increase in glucoraphanin content [83].…”