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Growth cycle of tulip plants. (A) Planting mother bulb. (B) Root elongation after planting. (C) Sprouting in spring. (D) Leaf expansion. (E) Flowering. (F) Bulblet growth and harvest. From Ohyama (1991).
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Abbreviations: DW, dry weight; GFn, oligofructan which has one glucose at the end and n mole of fructose; OMPD, 2-oxo-4-methyl-3-pentene-1,5-dioic acid Terminology used: Fig. corresponds to line drawings and graphs; Plate corresponds to photographs, gels or micrographs both at end of text as annexes. ABSTRACT Tulip bulb scales contain a large amoun...
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Tulip bulb scales contain a large amount of reserve carbohydrates, mainly starch and soluble sugars (sucrose and (2-1)-linked oligofructans). Starch accounts for about 60% of dry matter in scales just before planting, and over 60% of the starch decreases during the first three months after planting, coupled with a high accumulation of sucrose and o...
Abbreviations: DW, dry weight; GFn, oligofructan which has one glucose at the end and n mole of fructose; OMPD, 2-oxo-4-methyl-3-pentene-1,5-dioic acid Terminology used: Fig. corresponds to line drawings and graphs; Plate corresponds to photographs, gels or micrographs both at end of text as annexes. ABSTRACT Tulip bulb scales contain a large amoun...
Citations
... Research on tulip shows that starch is the major reserve carbohydrate in bulb scales from harvest until planting. After planting, starch is rapidly degraded in the first 3 months, and reserve carbohydrates in mother bulb scales are completely consumed by the flowering stage; however, in new bulblets, starch accumulation accelerates after flowering ( Ohyama et al. 2006). In peanut, the C currently fixed in leaves is rap- idly exported to petioles and stems and translocated to other plant parts in the form of fructose and glucose, but not sucrose, in contrast to other crops where sucrose is the major translocated form of photoassimilate ( Zheng et al. 2003). ...
Curcuma or Siam tulip (Curcuma alismatifolia Gagnep.) is an ornamental flowering plant with two underground storage organs, rhizomes and storage roots. Characteristics of N and C assimilation and transport in curcuma were investigated. The plants were treated with (15)NH(4) (+) + (15)NO(3) (-) and (13)CO(2) at 10, 13 or 21 weeks after planting. Plants were sampled at several stages up to 32 weeks. The C stored in old storage roots was used rapidly during the first 10 weeks; after which N stored in old rhizomes and old storage roots were used. The daily gain in C depending on photosynthesis was remarkably high between 10 and 21 weeks. However, the daily gain in N was relatively constant throughout the growth period. The (15)N absorbed at 10 weeks was initially accumulated in leaves and roots, but some was transported to flowering organs at 13 weeks. At harvest, 41% of (15)N was recovered in new rhizomes and 17% in new storage roots. After (13)CO(2) exposure at 10 and 13 weeks, the distribution of (13)C among organs was relatively constant in subsequent stages. When given (13)CO(2) at 21 weeks, a large amount of labelled C was recovered in new storage roots and new rhizomes at harvest. Both new rhizomes and new storage roots stored N and C, however, rhizomes played a more important role in supplying N, while storage roots provided C.
