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Changes in invertase activities during the photoperiodically induced bulb formation of onion (Allium cepa L.)
Author(s) -
Lercari Bartolomeo
Publication year - 1982
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1982.tb00712.x
Subject(s) - invertase , allium , bulb , chemistry , photoperiodism , horticulture , liliaceae , long day , botany , enzyme , biochemistry , biology
Onion ( Allium cepa L.) tissues contain both acid and neutral invertase activity with pH optimum at 5.2 and 7.0, respectively. The acid invertase was distributed between the pellets and the supernatant while neutral invertase activity was found only in the supernatant fraction of homogenate. A decrease in acid invertase activity both in the pseudostem and in the leaf‐blade was induced by long day conditions. Under long photoperiod the neutral invertase activity disappears in the pseudostem, while the neutral invertase activity in the leaf‐blades of bulbing plants is almost constant. Thus the activity of acid and neutral invertase change during the photoperiodic‐induced bulb development but independently of each other.