Agronomic and physiological performance of an <i>indica</i>–<i>japonica</i> rice variety with a high yield and high nitrogen use efficiency

Zhu, Kuanyu; Zhou, Qun; Shen, Yong; Yan, Jiaqian; Xu, Yunji; Wang, Zhiqin

doi:10.1002/csc2.20150

Cited by 30 publications

(16 citation statements)

References 64 publications

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“…Other studies have shown that improvements in the agronomic and physiological traits of rice contribute to yield enhancement (Cao et al., 2017; Chu et al., 2019; Li et al., 2012; Zhang et al., 2018; Zhu et al., 2020). In our study, two N treatments significantly increased plant height, LAI, LAD, aboveground biomass, RDW, number of panicles and spikelets per panicle of two rice genotype plants as compared with 0N treatment.…”

Section: Discussionmentioning

confidence: 99%

Effect of nitrogen rates on the growth and grain yield of a leaf early‐senescent rice mutant

Zhu

et al. 2021

Agronomy Journal

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Nitrogen plays a vital role in regulating leaf senescence and yield formation in rice (Oryza sativa L.). However, little information is known about the effects of N rates on the growth and grain yield of rice plants with leaf early senescence. This study used a leaf early-senescent rice mutant (osled) and its wild type (WT) (93-11) and investigated how N rates of 0 kg ha -1 (0N), 240 kg ha -1 (240N), and 360 kg ha -1 (360N) influenced the main agronomic and physiological performance of the mutant osled. The results showed that 240N and 360N treatments increased grain yield of the osled plants by 201.5-222.9% and 266.4-287.9% as compared with 0N treatment, respectively, with the 360N treatment maintaining a similar agronomic nitrogen use efficiency (ANUE) as 240N. Leaf activity of the osled plants was enhanced with N supply levels showing increased leaf area, chlorophyll content, N content, and activities of N-related enzymes and photosynthetic rate, and lowered malondialdehyde content. In contrast to 0N, the two N treatments significantly increased plant height, aboveground biomass, tiller number and percentage of productive tillers of both rice genotypes. Compared with 240N, the 360N treatment particularly increased grain weight and percentage of filled grains for the osled plants through improving leaf activity, root activity, and grain activity. These results verify that N treatment regulates leaf senescence and reduces yield loss of the osled plants, and simultaneously implied that the osled plants more positively respond to high N supply.

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Section: Discussionmentioning

confidence: 99%

Effect of nitrogen rates on the growth and grain yield of a leaf early‐senescent rice mutant

Zhu

et al. 2021

Agronomy Journal

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“…Similarly, LHT1 expression is observed mostly in source organs and is likely involved in the transport of amino acids between mesophyll cells and the xylem ( Ehness and Roitsch, 1997 ; Hirner et al, 2006 ). Experiments outside of the model plant species Arabidopsis have also provided evidence of the association between cytokinins and regulation of the expression of genes involved in amino acid transport ( Song et al, 2015 ; Ninan et al, 2019 ; Zhu et al, 2020 ). In addition to these observed changes in expression of amino acid transporter genes in response to cytokinins, corresponding changes in amino acid translocation are also observed.…”

Section: Cytokinin Regulation Of Source-sink Relationships: Effect On Amino Acid Transportmentioning

confidence: 99%

Cytokinin Regulation of Source-Sink Relationships in Plant-Pathogen Interactions

2021

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Cytokinins are plant hormones known for their role in mediating plant growth. First discovered for their ability to promote cell division, this class of hormones is now associated with many other cellular and physiological functions. One of these functions is the regulation of source-sink relationships, a tightly controlled process that is essential for proper plant growth and development. As discovered more recently, cytokinins are also important for the interaction of plants with pathogens, beneficial microbes and insects. Here, we review the importance of cytokinins in source-sink relationships in plants, with relation to both carbohydrates and amino acids, and highlight a possible function for this regulation in the context of plant biotic interactions.

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“…These cultivars produce significantly improved yields on account of the larger panicles and longer growth season compared with typical indica hybrid rice 15 , 16 . The nitrogen fertilizer application rate is important for dry matter accumulation, a high application rate is necessary in indica–japonica hybrid rice to obtain a higher yield than that attained with inbred hybrid rice 17 , 18 . In particular, nitrogen application must be sufficient to meet the demand for spikelet differentiation and the longer grain-ripening period 19 .…”

Section: Introductionmentioning

confidence: 99%

The nitrogen topdressing mode of indica-japonica and indica hybrid rice are different after side-deep fertilization with machine transplanting

Wang

Zhang

et al. 2021

Sci Rep

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Determination of the optimal fertilization method is crucial to maximize nitrogen use efficiency and yield of different rice cultivars. Side-deep fertilization with controlled-release nitrogen, in conjunction with machine transplanting and subsequent topdressing, was applied to Indica–japonica hybrid rice ‘Yongyou1540’ (YY1540) and indica hybrid rice ‘Tianyouhuazhan’ (TYHZ). Four nitrogen treatments were applied in 2018 and 2019: traditional nitrogen application with quick-release nitrogen (T1), single-dose deep fertilization at transplanting with 100% controlled-release nitrogen (T2), and deep fertilization of 70% controlled-release nitrogen and topdressing of 30% quick nitrogen at tillering (T3), or at panicle initiation (T4). Side-deep fertilization reduced the fertilizer application frequency without causing yield loss, T4 enhanced the yield of YY1540 by increasing the number of productive tillers and number of spikelets per panicle compared with T1, T2 and T3. The yield of TYHZ showed no significant difference among treatments. The T4 treatment decreased the number of tillers at the tilling peak stage and increased the percentage productive tillers and number of differentiated spikelets. Compared with the other treatments, T4 increased dry matter accumulation and leaf area index during panicle initiation and grain ripening, and contributed to enhanced nitrogen uptake and nitrogen utilization in YY1540. On average, nitrogen uptake and utilization in YY1540 were highest in T4, but no significant differences among treatments were observed in TYHZ. Dry matter accumulation and nitrogen uptake from panicle initiation to heading of YY1540 were correlated with number of spikelets per panicle, but no significant correlations were observed for TYHZ. Supplementary topdressing with quick-release nitrogen at the panicle initiation stage was required to increase yield of indica–japonica hybrid rice, whereas single-dose deep fertilization with controlled-release nitrogen is satisfactory for the indica hybrid cultivar.

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Agronomic and physiological performance of an indica–japonica rice variety with a high yield and high nitrogen use efficiency

Cited by 30 publications

References 64 publications

Effect of nitrogen rates on the growth and grain yield of a leaf early‐senescent rice mutant

Effect of nitrogen rates on the growth and grain yield of a leaf early‐senescent rice mutant

Cytokinin Regulation of Source-Sink Relationships in Plant-Pathogen Interactions

The nitrogen topdressing mode of indica-japonica and indica hybrid rice are different after side-deep fertilization with machine transplanting

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