Competitive water relations between leaves and flower bud during transport of cut roses
Cut roses (Rosa hybrida L. "Bridal Pink") were subjected to wet- or dry-transport at 5 degrees C for 24 to 72 hr and the resulting competition for water between leaves and a flower bud was studied. Water loss during the dry-transport was closely related to the decrease in water potential....
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Published in | Engei Gakkai zasshi Vol. 67; no. 4; pp. 532 - 536 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
THE JAPANESE SOCIETY FOR HORTICULTURAL SCIENCE
01.07.1998
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Subjects | |
Online Access | Get full text |
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Summary: | Cut roses (Rosa hybrida L. "Bridal Pink") were subjected to wet- or dry-transport at 5 degrees C for 24 to 72 hr and the resulting competition for water between leaves and a flower bud was studied. Water loss during the dry-transport was closely related to the decrease in water potential. Bent neck was observed in 50% of cut flower when petal and leaf water potentials became -0.9 and -1.2 MPa, respectively. Stomatal conductance decreased throughout the 72 hr dry-transport period. Rehydration did not restore completely the conductance. The hydraulic conductance of basal stem segments decreased with an increase in the duration of dry- and wet-transport, but that of the upper segments decreased only in the dry-transport. No significant difference existed between conductance measured acropetally and basipetally in the uppermost stem segment. Consequently, the water potential of leaves was higher than that of petals, which suggests that when a strong competition for water develops between these two organs during the dry-transport period, water flows from the petals to the leaves. A comparison between water loss from the individual organs and that of the intact cut flowers revealed that 19% of the initial fresh weight was lost from the intact cut flowers after 72 hr dry-transport; 1/3 of the water lost was translocated to the leaves from the flower bud |
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Bibliography: | 1998006830 J11 |
ISSN: | 0013-7626 1880-358X |
DOI: | 10.2503/jjshs.67.532 |