Genotypic Variation in Osmotic Stress Tolerance Among Rice Cultivars and Its Association with L-Type Lateral Root Development

Root development and the expression of aquaporin genes in rice seedlings under osmotic stress

“…L-type lateral root development is considered a key trait for adaptation to conditions where water availability is low (Bañoc et al, 2000, Suralta et al, 2008. Toyofuku et al (2015) compared the genotypic difference in L-type lateral root formation between osmotic stress tolerant and stress sensitive genotypes and showed that under osmotic stress, L-type lateral root development was better in stress tolerant genotypes. These results indicated that L-type lateral root development is an important root trait involved in stress tolerance in rice; therefore, L-type lateral root development in 'Puluik Arang' might contribute towards better water uptake under osmotic stress.…”

Osmotic Stress Leads to Significant Changes in Rice Root Metabolic Profiles between Tolerant and Sensitive Genotypes

“…Matsunami et al [13] reported genotypic differences in biomass production in shoots and roots under soil moisture deficit using the RDRS. In our previous studies, the genotypic variations to affect the osmotic stress tolerances and morphological characteristics of the root system were shown among 59 cultivars of rice seedlings, including 54 cultivars in RDRS [14]. Root growth was maintained in cultivars whose shoot growth was maintained under osmotic stress.…”

“…In this experiment, it was found that, under osmotic stress, IR 58 minimized losses of its aboveground biomass by maintaining root development and thereby maintained its ability to gain photosynthetic products for the development of roots (Figure 1). Our previous study characterized the morphology of IR 58 roots under stress and found that IR 58 maintained the root system under osmotic stress by enhancing the number of L-type lateral roots, which are longer and thicker lateral roots [14]. Sucrose has been reported to accumulate in plants and plays important regulatory functions in stressed plants [5,15].…”

“…Two indica rice (Oryza sativa L.) cultivars 'IR 58' and 'Basilanon' were selected from our previous study as osmotic stress-tolerant (IR 58) and stress-sensitive (Basilanon) cultivars [14]. Plants were grown in a growth chamber (MLR-350H; Sanyo Ltd., Moriguchi, Japan) at 28 ± 0.2 • C with a relative humidity of 70%, and a 12 h photoperiod.…”

“…In this study, we conducted a metabolome analysis of the roots of rice in order to compare the responses of stress-tolerant and -sensitive cultivars, which were selected from RDRS in our previous study [14], grown under osmotic stress conditions. The objective of this study was to identify metabolites and their underlying pathways associated with osmotic stress tolerance, that is, metabolites that show a distinct response to osmotic stress and to clarify their genotypic differences.…”