| dc.description.abstract | Salinity intrusion is regarded as the most currently challenging issue that Vietnam's
agriculture is facing, particularly with concern to rice production. Especially, rice
experiences restricted growth primarily through osmotic and ionic stress under salinity
conditions, one type of abiotic stress. The exogenous application of bio-substances is
gaining attention in dealing with abiotic stress through the diminishing impact of salt
stress. Oligochitosan (COS), derived from shrimp by-product, with a lower molecular
weight, better solubility, and the ability to enhance plant growth and tolerance is
regarded as an effective and “green” option. In this study, three concentrations of
COS—100, 200, and 300 ppm—were evaluated via foliar sprays to the local rice
variety Dai Thom 8 in two different conditions: normal and salinity with 100 mM NaCl
application, then assessed at the plant vegetative growth. The results showed that COS
treatment displayed positive effects on seedling length, biomass, and chlorophyll
contents under both conditions while maintaining the relative water content (RWC) in
plant tissue under salt stress. At 200 ppm, COS exhibited not only the maximal
efficiency in terms of increasing shoot length (by 21.09%) and biomass (by 54.49%)
compared to the control group under normal conditions but also maintained the RWC
and enhanced chlorophyll content (by 2.17 units) in saline conditions. In summary, the
COS 200 ppm concentration demonstrated the ability to effectively shield rice plants
from salinity while promoting plant growth in both conditions. Additionally, more
investigations related to leaf and root parameters with COS application on rice
seedlings under normal and saline conditions should be considered to give a thorough
prospectives on this scenario. | en_US |
