ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

The expression of histone 2A in onion (Allium cepa) during the onset of dormancy, storage and emergence from dormancy.

Carter, C. E.; Partis, M. D.; Thomas, B.;

New Phytologist Year: 1999 Vol: 143 Issue: 3 Pages: 461-470 Ref: 30 ref.

1999

บทคัดย่อ

The tissue-specific and developmental expression of histone 2A was studied in onion cv. Robusta using northern blots. Histone 2A expression was enriched in basal tissues, particularly in the inner, meristematically active parts of bulbs. The expression was assessed during a time course of bulb development, dormancy onset and postharvest sprouting in field-grown material. During bulb development histone 2A expression in the inner bulb declined rapidly during bulb ripening, reaching a minimum with the onset of dormancy. During postharvest storage, expression increased slowly, reaching a peak in the spring, coinciding with the first observed sprout emergence. It was concluded that in onion, as in other plant systems, histone 2A expression is linked to cell division and dormancy level, the peak in expression during postharvest storage indicating when dormancy was broken. In cultivars where postharvest sprouting occurred much earlier or much later than in Robusta, this expression peak occurred at abo

ut the same time of year, regardless of sprouting time. It was concluded that differences in storage longevity between cultivars were not due to differences in the timing of dormancy breaking. Factors controlling the rate of sprout emergence post-dormancy are probably major determinants of storage capacity.