Differential Salinity Tolerance among<i>Oryza glaberrima</i>, Oryza sativa and Their Interspecies Including NERICA

Awala, Simon K.; Nanhapo, Pamwenafye I.; Sakagami, Jun‐Ichi; Kanyomeka, Luke; Iijima, Morio

doi:10.1626/pps.13.3

Cited by 18 publications

(18 citation statements)

References 21 publications

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“…These results suggest that NERICA rice is not only droughttolerant but also salt-tolerant, and certainly more salt-tolerant than japonica Nipponbare. This is in agreement also with previous report that NERICA 1 is more tolerant to salt stress than NERICA 2 (Awala et al 2010). Additionally, NERICA 1 and NERICA 7 showed superior growth at the 2 nd leaf stage ( Figure 1a).…”

Section: Discussionsupporting

confidence: 94%

Effect of salt stress on physiological response and leaf polyamine content in NERICA rice seedlings

Yamamoto¹,

Sawada²,

Shim³

et al. 2011

PLANT SOIL ENVIRON

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NERICA is a new African rice variety, developed by the West African Rice Development Association (WARDA) in 1990s. NERICA rice shows both vigorous growth and tolerance of stressors such as drought and disease. The purpose of this study was to clarify the physiological and biochemical responses to salt stress of NERICA rice seedlings. The degree of growth inhibition caused by salt stress was small in NERICA rice varieties as compared with japonica Nipponbare. Na accumulation in leaf blades was high in salt-sensitive varieties. Accumulation of proline, a known compatible solute, was also induced by salt stress, especially in salt-sensitive varieties; it was thought that this accumulation was brought on salt-stress injury. The contents of polyamines, especially spermidine, were high in the pre-stressed leaf blades of NERICA rice seedlings. After the salt-stress treatment, the polyamine content of leaf blades differed with the degree of salt tolerance of the NERICA rice seedlings. These results suggested that the salt tolerance of NERICA rice seedlings might be associated not only with the regulation of Na absorption and translocation but also with their ability to maintain leaf polyamine levels under salt-stress conditions.  

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Section: Discussionsupporting

confidence: 94%

Effect of salt stress on physiological response and leaf polyamine content in NERICA rice seedlings

Yamamoto¹,

Sawada²,

Shim³

et al. 2011

PLANT SOIL ENVIRON

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“…Some areas called floodplains or inland valleys in semi-arid countries temporarily offer sufficient water for rice production by receiving flooded water from the surrounding areas (Andriesse and Fresco, 1991;Turner and Congalton, 1998). Namibia does not own an irrigation system but has a high potential of rice production with minimum water availability (Awala et al, 2009(Awala et al, , 2010. The annual rainfall in Namibia is 50 − 600 mm (Bethune et al, 2005) but the seasonal wetlands formed during the rainy season due to flooded water from Angola, have high rice productivity.…”

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confidence: 99%

Role of Canopy Coverage in Water Use Efficiency of Lowland Rice in Early Growth Period in Semi-Arid Region

Suzuki

Ohta

Izumi

et al. 2013

Plant Production Science

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An appropriate combination of rice cultivar and cropping system that maximizes water use efficiency (WUE) may improve yield of rainfed lowland rice. In the paddy field, a large amount of water is consumed by evaporation during the early growth period, and it can be reduced by canopy coverage especially in semi-arid regions. Therefore, we evaluated the role of canopy coverage in WUE of rice in the early growth period in semi-arid region. A pot experiment was conducted in Namibia to investigate the genotypic and species difference in WUE, and another pot and a field experiment were conducted to investigate the effects of planting density on WUE. Although no significant difference was observed among species, the mean WUE was in the decreasing order of Oryza sativa, and Oryza glaberrima followed by the interspecific progenies including NERICA. In contrast, there was a significant difference in WUE at the genotypic level. Highly tillering genotypes such as WAB1159-2-12-11-5-1 and WITA 2 showed a high WUE. Furthermore, WUE was significantly correlated with the number of tillers (R 2 = 0.453), and higher planting density resulted in a higher WUE. In contrast, stomatal conductance had no significant correlation with WUE (R 2 = 0.081). Thus, the physical conditions affected by number of tillers and planting density had greater impacts on WUE than physiological characteristics such as stomatal conductance. The suppression of surface water evaporation by coverage was significant, probably contributing to WUE improvement. To increase WUE in semi-arid regions, we recommend the increase of canopy coverage and higher planting density.

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“…Furthermore, we found out that WAB56-104 (O. sativa parent of NERICA1 to NERICA11) has greater cold tolerance based on spikelet fertility than the NERICAs and serves as a good genetic resource for breeding and improvement of cold tolerance of rice cultivars (Wainaina et al, 2015). WAB56-104 has also been reported to possess other beneficial traits such as salinity tolerance and striga weed pre-attachment resistance (Awala et al, 2010;Jamil et al, 2011). In this study, we tried to investigate the genomic regions associated with cold tolerance in WAB56-104 and further improve on its cold tolerance.…”

Section: Agronomic Traits Measurementsmentioning

confidence: 95%

Identification and validation of QTLs for cold tolerance at the booting stage and other agronomic traits in a rice cross of a Japanese tolerant variety, Hananomai, and a NERICA parent, WAB56-104

Wainaina

Makihara

Nakamura³

et al. 2018

Plant Production Science

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In Africa, cold temperatures occur in the highlands of East and Southern Africa and in some areas of the Sahel region of West Africa leading to substantial rice yield losses. Cold tolerance (CT) at booting stage on basis of spikelet fertility after cold water irrigation was evaluated using F 2 population derived from a cross between temperate japonica, Hananomai, and tropical japonica, WAB56-104. Two Quantitative trait loci (QTLs) for CT were detected on chromosome 8 and 10 with enhanced effects on the trait coming from Hananomai and WAB56-104 allele, respectively. The QTLs explained 30% and 33% of phenotypic variation in spikelet fertility, respectively. CT was negatively correlated with panicle number (r = −0.35, p < 0.01) and positively correlated with panicle weight (r = 0.61, p < 0.001). Selected BC 1 F 4 and BC 1 F 5 genotypes having homozygous alleles for both CT QTLs exhibited higher spikelet fertility under cold stress. The identified QTLs will be useful in the development of cold-tolerant varieties for production in high altitude areas through marker-assisted selection.

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Differential Salinity Tolerance amongOryza glaberrima, Oryza sativa and Their Interspecies Including NERICA

Cited by 18 publications

References 21 publications

Effect of salt stress on physiological response and leaf polyamine content in NERICA rice seedlings

Effect of salt stress on physiological response and leaf polyamine content in NERICA rice seedlings

Role of Canopy Coverage in Water Use Efficiency of Lowland Rice in Early Growth Period in Semi-Arid Region

Identification and validation of QTLs for cold tolerance at the booting stage and other agronomic traits in a rice cross of a Japanese tolerant variety, Hananomai, and a NERICA parent, WAB56-104

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