| Name: | Description: | Size: | Format: | |
|---|---|---|---|---|
| 460.82 KB | Adobe PDF |
Advisor(s)
Abstract(s)
Breeding for better keeping quality: validation of the
selection method of promising genotypes.
Water stress is one of the most important postharvest quality
problems, resulting in shorter vase life and reduced consumer‟s
satisfaction. This problem is enhanced in plants grown at high RH
(RH > 85%) due to stomatal malfunctioning leading to shorter
postharvest longevity. Previously, a subset of a segregating tetraploid
population (60 genotypes) cultivated in a greenhouse under noncontroled
RH was characterized for stomatal responsiveness to water
stress (i.e. desiccation). The population screening revealed extreme
differences of relative water content (RWC) after 4 h leaf desiccation.
This study aims at the validation of a selection method for promising
genotypes with good stomatal responsiveness to desiccation (i.e. high
RWC after 4 h desiccation) when grown under contrasting HR
conditions. Therefore, five genotypes with expected good stomatal
response to desiccation were selected for this study. These genotypes
were grown under moderate RH (60%) and high RH (90%). The RWC
was significantly different within the five studied genotypes. K099
was the most tolerant genotype to desiccation, with a RWC after 4 h
desiccation 19% higher than the least tolerant genotype. Genotypes
cultivated at high RH had on average only 10% lower RWC, as
compared to genotypes grown at moderate RH, confirming a good
stomatal response. The postharvest longevity varied between 12
(K119) and 25 (K099) days and it was not significantly affected by the
two different RH during growth. It is concluded that the analysis of
the stomatal responsiveness in leaves of cut roses is an efficient method that allows, in the early stages of the selection process, to
identify tolerant genotypes to high RH.
Description
Keywords
Elative humidity Rosa hybrida Stomata Transpiration rate Vase life
Pedagogical Context
Citation
CARVALHO, D. R. A…[et al.] - Melhoramento para elevada qualidade pós-colheita: validação do método de selecção de genótipos promissores. In V Jornadas Ibéricas de Horticultura Ornamental - Faro, Portugal, 13-15 Outubro, 2011 - Actas Portuguesas de Horticultura, n.º 19. [Lisboa]: Associação Portuguesa de Horticultura, 2011. p. 90-102
Publisher
Associação Portuguesa de Horticultura