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Titolo:
CARBOHYDRATE STATUS OF TULIP BULBS DURING COLD-INDUCED FLOWER STALK ELONGATION AND FLOWERING
Autore:
LAMBRECHTS H; ROOK F; KOLLOFFEL C;
Indirizzi:
UNIV UTRECHT,DEPT PLANT ECOL & EVOLUT BIOL,SORBONNELAAN 16 3584 CA UTRECHT NETHERLANDS
Titolo Testata:
Plant physiology
fascicolo: 2, volume: 104, anno: 1994,
pagine: 515 - 520
SICI:
0032-0889(1994)104:2<515:CSOTBD>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
MEDICAGO-SATIVA L; INVERTASE ACTIVITY; CELL EXPANSION; METABOLISM; TAPROOTS; SUCROSE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
35
Recensione:
Indirizzi per estratti:
Citazione:
H. Lambrechts et al., "CARBOHYDRATE STATUS OF TULIP BULBS DURING COLD-INDUCED FLOWER STALK ELONGATION AND FLOWERING", Plant physiology, 104(2), 1994, pp. 515-520

Abstract

The effect of a cold treatment on the carbohydrate status of the scales and flower stalk of Tulipa gesneriana L. cv Apeldoorn bulbs during growth after planting was studied and compared with bulbs not given cold treatment. Bulbs were stored dry for 12 weeks at 5 degrees C (precooled) or 17 degrees C (noncooled). Only the 5 degrees C treatment led to rapid flower stalk elongation and flowering following planting at higher temperatures. Precooling enhanced mobilization of starch, fructans, and sucrose in the scales. The cold-stimulated starch breakdown was initially accompanied by increased alpha-amylase activity per scale. In noncooled bulbs, alpha-amylase activity slightly decreased or remained more or less constant. Cold-induced flower stalk elongation was partially accompanied by a decrease in the sucrose content and an increase in the glucose content and invertase activity per g dry weight. The starch content in internodes initially decreased and subsequently increased; alpha-amylase activity per g dry weight of the lowermost internode showed a peak pattern during starch breakdown and increased thereafter. The internodes of noncooled bulbs, on the contrary, accumulated sucrose. Their glucose content and invertase activity per g dry weight remained low. Starch breakdown was not found and alpha-amylase activity per g dry weight of the lowermost internode remained at a tow level. Precooling of tulip bulbs thus favors reserve mobilization in the scales and flower stalk and glucose accumulation in the elongating internodes.

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Documento generato il 24/09/20 alle ore 05:17:47