Genotypic differences for grain yield and nitrogen utilization in Indica and Japonica rice under Mediterranean conditions

Koutroubas, Spyridon D.; Ntanos, Dimitrios

doi:10.1016/s0378-4290(03)00067-4

Cited by 135 publications

(118 citation statements)

References 16 publications

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“…Low grain N concentration (Ng%) was also associated with high NUE g (Tirol-Padre et al 1996;Singh et al 1998;Inthapanya et al 2000;Koutroubas and Ntanos 2003). Grain N concentration decreases by about 0.1% as NUE g increases by 7 to 10 kg kg -1 as grain N concentration decreases by about 0.1% (Tirol-Padre et al 1996;Koutroubas and Ntanos 2003). Genotypes with high HI were more efficient in N use (Inthapanya et al 2000).…”

Section: Plant Traits Related To Nitrogen Use Efficiencymentioning

confidence: 97%

“…Genotypes with higher NUE g had a lower percentage of straw N (Ns%) at maturity (Tirol-Padre et al 1996;Singh et al 1998;Koutroubas and Ntanos 2003). Low grain N concentration (Ng%) was also associated with high NUE g (Tirol-Padre et al 1996;Singh et al 1998;Inthapanya et al 2000;Koutroubas and Ntanos 2003). Grain N concentration decreases by about 0.1% as NUE g increases by 7 to 10 kg kg -1 as grain N concentration decreases by about 0.1% (Tirol-Padre et al 1996;Koutroubas and Ntanos 2003).…”

Section: Plant Traits Related To Nitrogen Use Efficiencymentioning

confidence: 98%

“…Mean NUE g of the 16 genotypes ranged from 55 to 84 kg kg -1 . Koutroubas and Ntanos (2003) studied NUE g of five cultivars with N application under Mediterranean conditions. They reported that indica cultivars generally had higher NUE g than japonica cultivars.…”

Section: Genotypic Variation In Nitrogen Use Efficiencymentioning

confidence: 99%

“…It may not be feasible to improve NUE g by reducing Ng% using conventional breeding because grain N concentration is affected more by environments than by genotypes . Koutroubas and Ntanos (2003) reported that difference in NHI explained genotypic variation in NUE g . There was a significant positive correlation between NUE g and N translocation ratio (NTR), which was calculated as the ratio of grain N content at maturity to plant N content at flowering (Samonte et al 2006).…”

Section: Plant Traits Related To Nitrogen Use Efficiencymentioning

confidence: 99%

“…Longer duration could result in a decrease in NUE g (Samonte et al 2006). Koutroubas and Ntanos (2003) argued that using single selection criteria for improving NUE may have negative implications on grain yield because of interaction among NUE-related traits. Broadbent et al (1987) stated that the evaluation of NUE of different genotypes should be based on multiple parameters rather than just one parameter.…”

Section: Plant Traits Related To Nitrogen Use Efficiencymentioning

confidence: 99%

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Prospects for Genetic Improvement to Increase Lowland Rice Yields with Less Water and Nitrogen

Peng¹,

Bouman²

Scale and Complexity in Plant Systems Research

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Abstract. Increasing yield potential of lowland rice remains to be the top priority in rice geneticimprovement programmes, because rice farmers' primary concern is still grain yield and world rice production has to increase by 1% annually in the next 20 years to meet the demand of the growing population. Improvements in yield potential of irrigated lowland rice were achieved under ample supply of water and nutrients. Water use efficiency (WUE) and nitrogen use efficiency (NUE) were seldom included in the breeding objectives for irrigated lowland rice. Scarcity of freshwater resources has threatened the production of the flood-irrigated rice crop, and excessive use of N fertilizer is causing environmental concerns. We have to increase lowland rice yield with less water and N. Newly developed crop management strategies have proven to be effective in increasing WUE and NUE. Several watersaving technologies such as alternate wetting and drying (AWD) and aerobic rice system have been developed to increase the water productivity of rice. However, yield penalty occurred when these watersaving technologies were practised with current varieties. New varieties have to be developed to reduce the yield loss under AWD and aerobic rice system in order to increase WUE further. Direct selection for WUE under flood-irrigated lowland conditions may have a negative impact on grain yield under watersaving strategies. Optimizing the timing and rate of N application to synchronize supply and demand of N by the crop has resulted in a great reduction in fertilizer-N input without yield loss and greater NUE. Genetic improvement of NUE has not been achieved in rice. Genotypic variation in NUE has been reported in many studies. Plant traits that are associated with high grain yield and high NUE should be identified so that breeders are able to use these traits easily as selection criteria in the breeding programme to develop N-efficient varieties without sacrificing rice yield potential. New breeding techniques such as development of F 1 hybrids, marker-aided selection, transformation and genetic engineering should be combined effectively with the empirical breeding method in order to increase rice grain yield with less water and N.

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Section: Plant Traits Related To Nitrogen Use Efficiencymentioning

confidence: 97%

Section: Plant Traits Related To Nitrogen Use Efficiencymentioning

confidence: 98%

Section: Genotypic Variation In Nitrogen Use Efficiencymentioning

confidence: 99%

Section: Plant Traits Related To Nitrogen Use Efficiencymentioning

confidence: 99%

Section: Plant Traits Related To Nitrogen Use Efficiencymentioning

confidence: 99%

See 3 more Smart Citations

Prospects for Genetic Improvement to Increase Lowland Rice Yields with Less Water and Nitrogen

Peng¹,

Bouman²

Scale and Complexity in Plant Systems Research

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Crop Improvement for Nitrogen Use Efficiency in Irrigated Lowland Rice

Peng

2011

The Molecular and Physiological Basis of Nutrient Use Efficiency in Crops

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There is an urgent need to develop superior nitrogen -effi cient rice varieties because of poor fertilizer nitrogen use effi ciency (NUE), associated economic and environmental concerns, and the lack of adoption of improved nitrogen management practices. Genotypic variation in NUE has been reported for rice in many studies. The physiological mechanisms underlying both nitrogen uptake effi ciency and utilization effi ciency are fairly well understood. Plant traits that are closely associated with NUE have been identifi ed. In general, there is a positive relationship between grain yield and NUE, suggesting that it is possible to develop rice varieties with both high grain yield and high NUE. An empirical breeding method can be used for developing nitrogeneffi cient varieties using existing genotypic variation in NUE. However, for signifi cant improvement in NUE, new breeding techniques such as the development of F 1 hybrids, marker -aided selection, transformation, and genetic engineering should be considered.

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Varietal differences in stem assimilate translocation and lodging resistance of rice under reduced nitrogen input

Li,

Yang,

Zhang

et al. 2024

Agrosystems Geosci & Env

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The low translocation rate of stem assimilates and lodging under high nitrogen conditions are major factors limiting the realization of the yield potential of rice. The objectives of this study were to (1) determine the characteristics of stem nonstructural carbohydrates (NSCs) translocation and lodging resistance in different types of rice varieties and (2) elucidate the responses of stem NSCs translocation and lodging resistance to reduced nitrogen (RN) input. Field experiments were conducted using four types of rice varieties with two nitrogen levels, including normal nitrogen (NN, namely, farmer's practice, 225 kg N ha−1 for indica conventional and indica hybrid rice and 300 kg N ha−1 for japonica conventional and indica–japonica hybrid rice in Jiangsu Province, China) and 20% RN (180 and 240 kg N ha−1, respectively). The results showed that there were significant differences in the stem NSCs translocation and lodging index of the basal stem among different types of varieties; indica hybrid rice was the highest, followed by indica conventional rice and indica–japonica hybrid rice, while japonica conventional rice was the lowest. The high activities of α‐amylase, β‐amylase, and sucrose phosphate synthase may contribute to high stem NSCs translocation. Correlation analysis revealed that NSCs translocation was significantly positively correlated with 1000‐grain weight, grain yield, and lodging index, while it was significantly negatively correlated with dry weight/length, dry weight/volume, and bending stress of the basal stem. Compared with NN, RN significantly improved NSCs translocation and had no significant effect on the lodging resistance‐related traits of the basal stem or grain yield. Therefore, this research indicates that a 20% reduction in nitrogen input can maintain grain yield by enhancing stem assimilate translocation without lodging resistance reduction and consequently synergizing nitrogen reduction, high yield, and lodging resistance.

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Genotypic differences for grain yield and nitrogen utilization in Indica and Japonica rice under Mediterranean conditions

Cited by 135 publications

References 16 publications

Prospects for Genetic Improvement to Increase Lowland Rice Yields with Less Water and Nitrogen

Prospects for Genetic Improvement to Increase Lowland Rice Yields with Less Water and Nitrogen

Crop Improvement for Nitrogen Use Efficiency in Irrigated Lowland Rice

Varietal differences in stem assimilate translocation and lodging resistance of rice under reduced nitrogen input

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