A better root morpho-physiology after heading contributing to yield superiority of japonica/indica hybrid rice

Meng, Tianyao; Wei, Huanhe; Li, Xiaoyun; Dai, Qigen; ZhongYang, Huo

doi:10.1016/j.fcr.2018.08.024

Cited by 56 publications

(29 citation statements)

References 33 publications

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“…According to Liu et al [30], higher total spikelets number, which led to a larger sink capacity and large panicle size, is beneficial for the increase of yield potential. In this study, we observed significant higher spikelet per panicle in Yongyou 12 and Yongyou 538 as compared with Xiushui 134 and Jia 58 (Table 5), which contributed to the higher grain yields of Yongyou 12 and Yongyou 538, in terms of yield components, as suggested by Meng et al [9]. However, this was contradictory to the previous studies that reported the hybrid rice tended to have higher grain filling percentage and grain weight than the inbred rice [31,32].…”

Section: Discussioncontrasting

confidence: 83%

“…Rice roots with good morphology and excellent physiology are beneficial to the acquisition of nutrients that maintain crop plants growth [35,36]. Several studies have demonstrated that japonica/indica hybrid rice had a stronger and more active root system than japonica conventional rice [9,33]. This could explain why japonica/indica hybrid rice absorb more nitrogen than japonica conventional rice.…”

Section: Discussionmentioning

confidence: 99%

“…However, the promotion of japonica/indica hybrids for large-scale applications has been greatly limited by various factors, including the low rate of grain filling [7] and sterility in the first generation [8]. In recent years, great progress has been achieved in solving some of these obstacles, and high-yielding japonica/indica hybrids have been bred successfully and made available in China [9]. The Yongyou japonica/indica hybrid series, which is a late-maturity type, was one of the representative high-yielding japonica/indica hybrids.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of Agronomic Performance between Japonica/Indica Hybrid and Japonica Cultivars of Rice Based on Different Nitrogen Rates

et al. 2020

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Previous studies have revealed that the japonica/indica hybrid rice has a higher yield potential, biomass production, and nitrogen (N) accumulation than japonica rice in China, however, at a single N application rate. It remains unclear whether it also occurs at a higher or lower N application rate under the same field condition. To investigate the effects of nitrogen application rates on grain yield, N uptake, dry matter accumulation, and agronomic N use efficiency, field experiments were conducted in Jinhua City, Zhejiang Province during three consecutive growth seasons in 2016, 2017, and 2018. Two japonica/indica hybrid varieties (Yongyou 12 and Yongyou 538) and two japonica varieties (Xiushui 134 and Jia 58) were exposed to five N application rates (0, 150, 225, 300, and 375 kg ha−1). The results showed that grain yields of all the varieties increased with increasing nitrogen application rates, except for Jia 58 whose optimum nitrogen level was 225 kg ha−1, because no significant difference was observed between N225 and N300. Across the four rice varieties, N uptake increased significantly with increased N-fertilizer rates at all the growth stages (p < 0.05). Across the three planting years, the average grain yield of japonica/indica hybrid rice was higher than that of japonica rice by 75.6% at N0, 57.2% at N150, 41.1% at N225, 38.3% at N300, and 45.8% at N375. We also found that as compared with japonica rice, the japonica/indica hybrid rice had more grain yield, higher dry matter, and higher N uptake at all growth stages, regardless of the N application rate.

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Section: Discussioncontrasting

confidence: 83%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Comparison of Agronomic Performance between Japonica/Indica Hybrid and Japonica Cultivars of Rice Based on Different Nitrogen Rates

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“…To address this problem, China has successfully conducted a “super” rice project (Cheng, Zhuang, Fan, Du, & Cao, 2007); to date, ∼130 super rice varieties identified by China's Ministry of Agriculture have been produced (http://www.ricedata.cn/variety/superice.htm); however, among the super rice varieties, hybrid rice usually requires more N fertilizer to obtain a higher yield compared with the N needed for conventional rice, and thus hybrid rice generates a low N use efficiency (NUE) (Gu et al., 2017). Recently, indica – japonica hybrid rice (IJHR) such as Yongyou 2640 (Y‐2640) has been documented as having a high yield and high NUE (Hu et al., 2014; Meng, Wei, Li, Dai, & Huo, 2018; Xu et al., 2010) in the lower reaches of the Yangtze River by many previous studies; in addition, for IJHR Y‐2640, the utilization of intersubspecific heterosis had a distinct advantage over other rice varieties in terms of yield potential (Meng et al., 2018; Wei et al., 2017), which can mainly be attributed to the larger sink size (Hu et al., 2018; Zhang, Chen, Wang, & Yang, 2017), greater biomass accumulation, higher leaf area (Hu et al., 2018; Jiang et al., 2014), better root morphological architecture, including root length, root volume, and root density, and longer shoot stay‐green traits (Meng et al., 2018). Although the abovementioned root and shoot traits have been reported in a few studies, plant traits related to the IJHR variety Y‐2640 have still not been defined under low N conditions, especially those associated with physiological traits, and little information is available.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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Hybrid rice (Oryza sativa L.) varieties usually need more N application to produce a higher grain yield and exhibit lower N use efficiency (NUE) than inbreds. However, little information is available about the mechanism underlying an indica-japonica rice variety with high yield and high NUE under low N rates. This study investigated this issue. The indica-japonica hybrid rice variety Yongyou 2640 (Y-2640) and the japonica inbred rice variety Lianjing 7 (L-7) were grown in a paddy field at N rates of 0 and 200 kg N ha −1 . The results showed that the grain yield and internal NUE (grain yield/total N uptake of plants) of Y-2640 were 16-23% and 9-10%, respectively, higher than those of L-7. A higher grain yield for Y-2640 was mainly attributed to the greater spikelet number per unit area that resulted from greater root oxidation activity at panicle initiation and its higher crop growth rate and net assimilation rate before heading. A higher leaf area index and greater root length, root, and shoot biomass were the important agronomic traits of Y-2640. Higher cytokinin content and the expression of genes involved in the amino acid transporters OsAAP1 and OsLHT1 in the roots and leaves, a higher photosynthetic NUE, and a greater N harvest index were the main physiological traits of Y-2640. The results suggest that improved agronomic and physiological performance accounts for the high yield and high NUE for the indica-japonica hybrid rice variety.Abbreviations: AE N , agronomic nitrogen use efficiency; CGR, crop growth rate; CTK, cytokinin; HI N , nitrogen harvest index; IE N , internal nitrogen use efficiency; IJHR, indica-japonica hybrid rice; JIR, japonica inbred rice; L-7, Lianjing 7; LAD, leaf area duration; NAR, net assimilation rate; NUE, nitrogen use efficiency; PNUE, photosynthetic nitrogen use efficiency; RE N , apparent recovery efficiency of nitrogen fertilizer; ROA, root oxidation activity; Y-2640, Yongyou 2640; Z+ZR, zeatin + zeatin riboside.

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“…Due to tolerance to low temperature at the grain filling stage (Yoshida, ), japonica rice has a longer grain filling stage compared to that of indica rice (Wei et al., ), which alleviates the contradiction between large sink and small source capacity during the grain filling stage in late season rice (Chen, Lai, Wang, & Chen, ; Gu, Han, Dong, Chen, & Qiao, ). In addition, the newly released indica‐japonica hybrid cultivars (i.e., Yongyou serials) were reported to have greater sink and source capacity in the single season (Meng, Wei, Li, Dai, & Huo, ; Wei et al., ). Previous studies also suggested that the indica‐japonica cultivar maintains the phenological characters of japonica, but has the advantages of greater biomass accumulation and the high yield of indica rice (Wei et al., ; Wei et al., ).…”

Section: Introductionmentioning

confidence: 99%

Seasonal changes in crop growth and grain yield of different japonica rice cultivars in southeast China

et al. 2020

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It is unknown whether japonica rice bred up in the single season is suitable for growing in the late season in southeastern China. To evaluate the response of grain yield and growth traits of japonica varieties to the changing growing season, two types of japonica rice (inbred japonica and indica‐japonica hybrid rice) were planted during single and late seasons in 2016 and 2017. The grain yields of indica‐japonica hybrid rice were 8.3–9.5 t ha−1 and 9.2–10.8 t ha−1 in the late and single season, respectively, which were significantly greater than those of japonica inbred rice. In addition, the grain yields decreased when the growing season was switched from the single to the late season, being 17.3–23.7% for the inbred japonica rice and 4.0–9.7% for the indica‐japonica hybrid rice, indicating a small yield gap between the single and late season of the indica‐japonica hybrid rice. Furthermore, the indica‐japonica hybrid rice had a higher accumulated biomass, leaf area index (LAI), and spikelets per panicle; comparable phenological traits and leaf photosynthetic rate during panicle development; but lower grain weight and grain filling percentage compared with those of the inbred japonica rice. These results suggested that high grain yield of the indica‐japonica hybrid rice during the late season might be attributed to the high accumulation of biomass and the large panicle size. Thereby, we suggested that the great LAI during panicle development, high biomass accumulation before heading, and large panicle size might be useful as indicators for breeding the japonica variety during the late season.

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A better root morpho-physiology after heading contributing to yield superiority of japonica/indica hybrid rice

Cited by 56 publications

References 33 publications

Comparison of Agronomic Performance between Japonica/Indica Hybrid and Japonica Cultivars of Rice Based on Different Nitrogen Rates

Comparison of Agronomic Performance between Japonica/Indica Hybrid and Japonica Cultivars of Rice Based on Different Nitrogen Rates

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

Seasonal changes in crop growth and grain yield of different japonica rice cultivars in southeast China

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