Articles
GAS EXCHANGE OF FLOWER BUDS AND WATER TRANSPORT CAPACITY OF THE PEDUNCLE OF TWO CUT ROSES DURING VASE LIFE
Article number
847_40
Pages
301 – 308
Language
English
Abstract
Cut rose (Rosa hybrida L.) cultivars largely differ in their vase life and bent-neck resistances.
The most important factor determining these features is the postharvest water status management of plants, especially under drought stress.
Structure and function of the peduncle is crucial for the bent neck susceptibility.
In addition, all nutrients, carbohydrates, plant hormones and, of course, the water essential for flower development must pass through this part of the stem.
The cut rose cultivars Akitio, typically with a short vase life, and Red Giant with a long vase life were investigated.
To quantify the water transport capacity of the peduncle, the actual hydraulic conductivity of unstressed rose stems was measured destructively in summer and winter.
Furthermore, whole vase life gas exchange of flower buds was investigated from May 2006 to May 2007.
Dry matter related flower bud transpiration was always significantly higher in Red Giant (n=8) than in Akito (n=10). Throughout all studies the hydraulic conductivity was higher in Red Giant. However, differences were only significant in winter.
It can be assumed that the generally better postharvest water management of Red Giant plants may be related to a higher transport capacity.
In addition, Red Giant roses can achieve a long vase life despite of their high respiration rates.
The most important factor determining these features is the postharvest water status management of plants, especially under drought stress.
Structure and function of the peduncle is crucial for the bent neck susceptibility.
In addition, all nutrients, carbohydrates, plant hormones and, of course, the water essential for flower development must pass through this part of the stem.
The cut rose cultivars Akitio, typically with a short vase life, and Red Giant with a long vase life were investigated.
To quantify the water transport capacity of the peduncle, the actual hydraulic conductivity of unstressed rose stems was measured destructively in summer and winter.
Furthermore, whole vase life gas exchange of flower buds was investigated from May 2006 to May 2007.
Dry matter related flower bud transpiration was always significantly higher in Red Giant (n=8) than in Akito (n=10). Throughout all studies the hydraulic conductivity was higher in Red Giant. However, differences were only significant in winter.
It can be assumed that the generally better postharvest water management of Red Giant plants may be related to a higher transport capacity.
In addition, Red Giant roses can achieve a long vase life despite of their high respiration rates.
Authors
W. Graf, W.B. Herppich, S. Huyskens-Keil, H. Grüneberg
Keywords
postharvest, transpiration, respiration, hydraulic conductivity
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