Root Morphological Traits and Spatial Distribution under Different Nitrogen Treatments and Their Relationship with Grain Yield in Super Hybrid Rice

Liu, Ke; He, Aibin; Ye, Chang; Liu, Shaowen; Lü, Jianwei; Gao, Mengtao; Fan, Youzhong; Lu, Bao‐Rong; Tian, Xiaohong; Zhang, Yunbo

doi:10.1038/s41598-017-18576-4

Cited by 40 publications

(33 citation statements)

References 26 publications

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“…Vigorous root growth with high root length and surface area ensures the efficient absorption of macro and micronutrients at the early growth stage of the plant [72]. Furthermore, root architectural traits mainly total root length and root number were significantly and positively correlated with biomass and grain yield [73,74]. Therefore, the vigorous root system of the plant not only supports good crop establishment but also ensures the plants' survival under stressful conditions.…”

Section: Discussionmentioning

confidence: 99%

Genetic variation for root architectural traits in response to phosphorus deficiency in mungbean at the seedling stage

et al. 2020

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Roots enable the plant to survive in the natural environment by providing anchorage and acquisition of water and nutrients. In this study, root architectural traits of 153 mungbean genotypes were compared under optimum and low phosphorus (P) conditions. Significant variations and medium to high heritability were observed for the root traits. Total root length was positively and significantly correlated with total root surface area, total root volume, total root tips and root forks under both optimum P

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Section: Discussionmentioning

confidence: 99%

Genetic variation for root architectural traits in response to phosphorus deficiency in mungbean at the seedling stage

et al. 2020

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“…Hybrid and super hybrid rice cultivars often achieve high yields under optimum growing conditions, especially at high N input. Thus, hybrid and super hybrid rice may perform better than inbred rice only at high N application rate 20,[28][29][30] . Here, hybrids did not show any advantage over inbred varieties with respect to number of panicles per square meter, number of spikelets per panicle, or biomass production at low N input rate combined with high planting density.…”

Section: Discussionmentioning

confidence: 99%

Inbred varieties outperformed hybrid rice varieties under dense planting with reducing nitrogen

Lü

Wang

Chu

et al. 2020

Sci Rep

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Field experiments were conducted over two years to evaluate the effects of planting density and nitrogen input rate on grain yield and nitrogen use efficiency (NUE) of inbred and hybrid rice varieties. A significant interaction effect was observed between nitrogen input and planting density on grain yield. Higher number of panicles per square meter and spikelets per panicle largely accounted for the observed advantage in performance of inbred, relative to hybrid varieties. Compared with high nitrogen input rate, nitrogen absorption efficiency, nitrogen recovery efficiency, and partial factor productivity increased by 24.6%, 28.0%, and 33.3% in inbred varieties, and by 32.2%, 29.3%, and 35.0% in hybrids under low nitrogen input, respectively. Inbred varieties showed higher nitrogen absorption efficiency, nitrogen recovery efficiency, and partial factor productivity than hybrids, regardless of nitrogen input level. Nitrogen correlated positively with panicle number, spikelets per panicle, biomass production at flowering, and after flowering in inbred varieties but only with panicle number and biomass production at flowering in hybrids. Inbred varieties are more suitable for high planting density at reduced nitrogen input regarding higher grain yield and NUE. These findings bear important implications for achieving high yield and high efficiency in nutrient uptake and utilization in modern rice-production systems. Rice (Oryza sativa L.) is the main staple food for more than half the population of the world 1. As one of the largest rice producers and consumers, China occupied 18.8% of the global rice-growing area and accounted for 28.1% of the total production in 2014 2. Double-season rice cropping has significantly contributed to the increase in rice productivity in China; however, the cultivated area has decreased substantially due to labor migration and increased labor costs over the past decades 3. Therefore, it is necessary to develop labor-saving cultivation technologies to reverse the declining trend in rice cultivation area in this country. Mechanical transplanting is an alternative labor-saving technology in rice production 4. As efficient agriculture has been popularized in recent years, mechanical transplanting has been rapidly adopted for rice production in China 5. However, rice farmers still follow traditional field management practices even under the mechanical-transplanting production scheme 6. Previous studies confirmed that certain traditional management practices, such as nitrogen (N) fertilization utilize resources inefficiently and have negative environmental impacts 7,8. In China, the average N application rate for rice production is 180 kg ha −1 , which is 75% higher than the global average 9-11. Consequently, only 20-30% of applied N is actually absorbed by the crop, while most of it is lost to the environment 6. Over the past three decades, this N-fertilizer overuse in China has caused surface water eutrophication, soil acidification, increased greenhouse gas emissions, and enhanced N deposit...

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“…These results indicate that wild rice O. longistaminata can improve the lodging resistance without the stem length reduction. In other words, it is possible to breed high yield and high biomass cultivars with high lodging resistance, which may provide appropriate genetic resources for breeding tall super yielding rice (Yuan, 2017).…”

Section: Correlations Among Lodging Resistance-related Traitsmentioning

confidence: 99%

Deciphering the Genetic Basis of Lodging Resistance in Wild Rice Oryza longistaminata

et al. 2020

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The abuse of fertilizer results in tall rice plants that are susceptible to lodging and reduced plant yield. Hence, it is important to identify and utilize the quantitative trait loci (QTLs)/genes for lodging resistance breeding. Oryza longistaminata exhibits a strong stem and high biomass productivity, which could be a candidate gene pool for cultivars lodging resistance improvement. Here, a set of 152 BC 2 F 20 lines derived from a cross between a cultivated line 93-11 and O. longistaminata was evaluated for lodging resistance. QTL mapping analysis combined with single-nucleotide polymorphism (SNP) marker derived from high-throughput sequencing identified 12 QTLs for stem diameter (SD), 11 QTLs for stem length (SL), and 3 QTLs for breaking strength (BS). Of which, 14 QTLs were first identified from O. longistaminata. A major QTL, qLR1, which was delimited to a region ∼80 kb on chromosome 1, increased stem diameter, stem length, and breaking strength. Another major QTL, qLR8, that was delimited in an interval ∼120 kb on chromosome 8, significantly enhanced the breaking strength. These results provide evidence that O. longistaminata can be exploited to develop lodging-resistant rice lines.

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Root Morphological Traits and Spatial Distribution under Different Nitrogen Treatments and Their Relationship with Grain Yield in Super Hybrid Rice

Cited by 40 publications

References 26 publications

Genetic variation for root architectural traits in response to phosphorus deficiency in mungbean at the seedling stage

Genetic variation for root architectural traits in response to phosphorus deficiency in mungbean at the seedling stage

Inbred varieties outperformed hybrid rice varieties under dense planting with reducing nitrogen

Deciphering the Genetic Basis of Lodging Resistance in Wild Rice Oryza longistaminata

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