The Effect of Sulfur Fertilizer on Glucoraphanin Levels in Broccoli (B. oleracea L. var. italica) at Different Growth Stages
Journal of Agricultural and Food Chemistry, ISSN: 0021-8561, Vol: 52, Issue: 9, Page: 2632-2639
2004
- 48Citations
- 27Captures
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Metrics Details
- Citations48
- Citation Indexes48
- 48
- CrossRef36
- Captures27
- Readers27
- 27
Article Description
Three sulfur (S) treatements were imposed by applying gypsum to three broccoli cultivars (Claudia, Marathon, and TB-234) known to differ in glucoraphanin content of mature seeds. The S treatments were control (very low added S), low S (23 kg S ha), and high S (92 kg S ha). The gypsum applications during the early vegetative phase of the three broccoli cultivars increased S uptake and the glucoraphanin content in each plant organ. There were significant genotypic differences for the content of both S and glucoraphanin in all plant organs at different growth stages with gypsum applications. A large increase in S and glucoraphanin content was found in the green heads of broccoli and mature seeds. S present in glucoraphanin accounted for only 4-10% of total S content in broccoli heads. However, S present in glucoraphanin in mature seeds accounted for 40-46% of the total S in the seeds of moderate and high glucoraphanin cultivars (Marathon and TB-234). The partitioning of S into glucoraphanin also increased with gypsum applications. Differences in S uptake, S distribution between organs, and partitioning of S into glucoraphanin largely explained the differences in glucoraphanin content in the green heads and mature seeds for the three broccoli cultivars and three S treatments.
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