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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Bibliographic Details
Published inEngei Gakkai zasshi Vol. 67; no. 4; pp. 532 - 536
Main Authors Hu, Y. (Osaka Prefectural Univ., Sakai (Japan). Coll. of Agriculture), Doi, M, Imanishi, H
Format Journal Article
LanguageEnglish
Published THE JAPANESE SOCIETY FOR HORTICULTURAL SCIENCE 01.07.1998
Subjects
competition for water
CUT FLOWERS
cut rose
dry transport
evapotranspiration
FEUILLE
FLEUR
FLEUR COUPEE
FLOR CORTADA
FLORES
FLOWERS
HOJAS
LEAVES
PRIVACION DEL AGUA
PRIVATION D'EAU
ROSA
ROSA (GENERO)
TRANSPORT
TRANSPORTE
WATER DEPRIVATION
water relation
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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
Bibliography:1998006830
J11
ISSN:0013-7626
1880-358X
DOI:10.2503/jjshs.67.532