Water loss and postharvest characteristics of cut roses grown at high or moderate relative air humidity S. TorreCorresponding author contact information, E-mail the corresponding author, T. Fjeld Department of Horticulture and Crop sciences, NLH Agricultural University of Norway, P.O. Box 5022, N-1432 Ås, Norway Choose an option to locate/access this article: Check if you have access through your login credentials or your institution View full text Purchase $31.50 Abstract Single node cuttings with one mature leaf were taken from the rose cv. Baroness and rooted in water culture. The rooted stems were kept in water culture and subjected to one of the two levels of relative air humidity (RH) (high: 90%, moderate: 70%) in climate chambers. Morphological characteristics, dry weight (DW), osmotic concentration, hemicellulose, cellulose and lignin content in the pedicel and vase life behavior were studied, as well as water loss. Only negligible differences in growth and morphology were found. No clear difference in lignin, hemicellulose and cellulose content in pedicels was found between moderate and high RH grown roses. Uncontrolled water loss was characteristic for leaves from high RH roses. Base treatment with AgNO3 improved vase life of high RH roses from 7 to 12 days. Moderate RH roses lasted on average 15.5 days, and vase life was only slightly improved with the use of AgNO3. Preservative solutions caused crispy areas between the veins and brittle leaves on roses grown at high but not at moderate RH. A 10% lower osmotic concentration in leaves and flowers was found in roses grown at high RH, as compared to moderate RH. It is concluded that the shorter postharvest life of high RH flowers is mainly due to malfunctioning stomata. Keywords Bent neck; Air humidity; Rosa; Vase life; Water loss Abbreviations DW, dry weight; FW, fresh weight; PPFD, photosynthetic photon flux density; RH, relative air humidity Figures and tables from this article: Full-size image (12 K) Fig. 1. Change in leaf weight (g) from upper leaves, harvested from cv. Baroness roses grown at high (90%) and moderate (70%) RH, recorded 0–90 min after detachment. Broken lines indicate 95% CI (n=6). Figure options Table 1. Effects of high (90%) and moderate (70%) RH on growth and morphological characteristics of cv. Baroness
Posted on: Mon, 09 Sep 2013 05:21:31 +0000
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