Effect of abiotic stress on carotenoids accumulation in orange sweet potato callus under light and dark conditions
Abiotic stress factors are the main limitation to plant growth and yield in agriculture. Orange sweet potatoes may become major sources of carotenoids in the diet, but the extent of environmental and genetic influences on plant carotenoid biosynthesis are poorly understood. Carotenoid biosynthesi...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English English |
| Published: |
Universiti Putra Malaysia
2017
|
| Subjects: | |
| Online Access: | http://irep.iium.edu.my/62731/ http://irep.iium.edu.my/62731/ http://irep.iium.edu.my/62731/8/62731%20Effect%20of%20abiotic%20stress%20on%20carotenoids%20accumulation.pdf http://irep.iium.edu.my/62731/9/62731%20Effect%20of%20abiotic%20stress%20on%20carotenoids%20accumulation%20SCOPUS.pdf |
| Summary: | Abiotic stress factors are the main limitation to plant growth and yield in agriculture. Orange
sweet potatoes may become major sources of carotenoids in the diet, but the extent of
environmental and genetic influences on plant carotenoid biosynthesis are poorly understood.
Carotenoid biosynthesis is regulated by several factors such as water, light, pathogen, salinity,
nutrients and is susceptible to geometric isomerisation in the presence of oxygen, light and
heat which causes colour loss and oxidation. The main problems associated with carotenoid
accumulation arise from the inherent instability of pigments. In this study carotenoid biogenesis
is investigated in sweet potato callus culture as a potential model system for carotenogenesis
by analysing the effects of environmental stress agents such as NaCl (for salt tolerance), PEG
(for drought tolerance), salicylic acid (for pathogen stress or disease resistance) and nutrient
strength towards carotenoid content and composition. Results of this study revealed that the
bioactive compounds detected in orange sweet potato callus were α-carotene, β-carotene,
lutein and zeaxanthin. Not surprisingly, the response of sweet potato callus culture to such
environments appeared to be highly light dependent. Another factor is the activity of functional
enzymes and candidate enzymes that regulate carotenoid biosynthesis, which will determine
type and quantity of individual carotenoids. By understanding the environmental factors that
affected carotenoid biosynthesis, it should be possible to enhance the amount and type of
carotenoid that accumulates in sweet potato tubers. In conclusion, in vitro callus culture is
suggested as a successful new alternative approaches to enhance or enrich certain carotenoids
through controlled environment. |
|---|