Predicting Rice Yield Under Salinity Stress Using K/Na Ratio Variable in Plant Tissue

Abstract

Estimation of yield reduction in crop caused by the salinity stress is mostly based on variations of soil electrical conductivity and the severity of water stress. Crop response curves to salinity were developed without considering ion toxicity and nutritional imbalance in the plant. The objective of this study was to explore the possibility of using the ratio of the concentration of potassium by sodium in rice leaf (leaf-K/Na) to predict yield under the salinity stress. The rice (Oryza sativa L.) yield under fresh and saline condition and the leaf-K/Na related database was created. Data were collected from consecutive three seasons of a field experiment in the Africa Rice Center experimental farm in Senegal (16°11ʹ N, 16°15ʹW). We studied the relationship between the relative yield (Y r), a ratio of yield under the salinity stress to the potential yield and the leaf-K/Na (x). Furthermore, we did regression analyses and F-test to determine the best fitting function. Results indicate that the exponential function [i.e. Y r = 100 exp (-b x)] was the best fitting model with the lowest root mean square error (9.683) and the highest R 2 value (0.90). Example applications on independent data from published papers showed relatively good predictions, suggesting that the model can be used to predict rice yield in saline soils.

The Halophyte Species Solanum chilense Dun. Maintains Its Reproduction despite Sodium Accumulation in Its Floral Organs

“…For example, K contributed to anther dehiscence and pollen imbibition in rice [ 71 , 72 ]. Decrease of the K/Na ratio is commonly reported as symptomatic of salinity stress [ 73 ]. Surprisingly, we observed that the K/Na ratio is more important in the inflorescences of S. lycopersicum than in those of S. chilense , even at high NaCl concentration.…”

Effects of Low and Moderate Salinity on Zinnia marylandica

“…In fact, sodium exclusion is a common natural feature in most plants (Munns, 2005) and can be considered as a key mechanism for high Na + level (sodicity) tolerance (Genc et al, 2016). Moreover, salt-induced yield reduction has been correlated with K + /Na + in plant tissues in several studies (Chunthaburee et al, 2016;Reddy et al, 2017) and leaf K + /Na + was even suggested as a tool to predict rice yield under saline conditions (Mel et al, 2019).…”

Determination of salt tolerance levels and genetic relationships of Vicia sativa cultivars using gene targeted functional markers

“…Soil salinity is one of the most important abiotic stress factors directly limiting plant yield in agricultural production areas of all over the world (Shokat and Großkinsky 2019). Plants respond to salts in soil or in irrigation water at different levels by tuning complex physiological and molecular mechanisms (Mel et al 2019). High salt prevents the water uptake and creates a physiological drought (Khayamim et al 2014) or ion toxicity to the embryo of seeds, which directly limits fast and even seed germination (Farooq et al 2017).…”