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Low temperature maximizes growth of Crocus vernus (L.) Hill via changes in carbon partitioning and corm development.

Abstract：

:In Crocus vernus, a spring bulbous species, prolonged growth at low temperatures results in the development of larger perennial organs and delayed foliar senescence. Because corm growth is known to stop before the first visual sign of leaf senescence, it is clear that factors other than leaf duration alone determine final corm size. The aim of this study was to determine whether reduced growth at higher temperatures was due to decreased carbon import to the corm or to changes in the partitioning of this carbon once it had reached the corm. Plants were grown under two temperature regimes and the amount of carbon fixed, transported, and converted into a storable form in the corm, as well as the partitioning into soluble carbohydrates, starch, and the cell wall, were monitored during the growth cycle. The reduced growth at higher temperature could not be explained by a restriction in carbon supply or by a reduced ability to convert the carbon into starch. However, under the higher temperature regime, the plant allocated more carbon to cell wall material, and the amount of glucose within the corm declined earlier in the season. Hexose to sucrose ratios might control the duration of corm growth in C. vernus by influencing the timing of the cell division, elongation, and maturation phases. It is suggested that it is this shift in carbon partitioning, not limited carbon supply or leaf duration, which is responsible for the smaller final biomass of the corm at higher temperatures.

journal_name

J Exp Bot

journal_title

Journal of experimental botany

authors

Lundmark M,Hurry V,Lapointe L

doi

10.1093/jxb/erp103

subject

Has Abstract

pub_date

2009-01-01 00:00:00

pages

2203-13

issue

7

eissn

0022-0957

issn

1460-2431

pii

erp103

journal_volume

60

pub_type

杂志文章

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