Agronomic and physiological characteristics of high‐yielding ratoon rice varieties

Zhang, Qiang; Liu, Xiangchen; Yu, Guilong; Wang, Hao; Feng, Danni; Zhao, Haiying; Liu, Lijun

doi:10.1002/agj2.20871

Cited by 17 publications

(11 citation statements)

References 36 publications

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“…The lower spikelets m −2 resulted from the lower NSC content in the stubble (Table 4). A recent study indicated that the ratio of the spikelet number and LAI (i.e., the number of spikelets per unit area at the maturation stage/LAI at full heading stage) was negatively correlated with grain yield of the second crop (Zhang et al., 2021). In our previous study, CSSL‐ GN1 Takanari did not have a higher LAI than Koshihikari (Nakano et al., 2017).…”

Section: Discussionmentioning

confidence: 99%

Nonstructural carbohydrate content in the stubble per unit area regulates grain yield of the second crop in rice ratooning

2022

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Rice (Oryza sativa L.) ratooning has attracted attention due to its higher yield potential. In the present study, a field experiment on rice ratooning using two rice genotypes, near isogenic line (NIL)-GN1A Takanari and Koshihikari, was conducted in 2019 and 2020 in southwestern Japan to obtain direct evidence for the role of stubble nonstructural carbohydrate (NSC) concentration and/or content per unit area on grain yield of the second crop and to determine the effectiveness of a gene producing more spikelets. NIL-GN1A Takanari is a near isogenic line carrying an allele of GN1A, which is a gene regulating the number of spikelets per unit area derived from an indica cultivar Takanari in the genetic background of a japonica cultivar Koshihikari, and it can produce more spikelets than Koshihikari. NIL-GN1A Takanari did not produce a higher grain yield of the first crop than Koshihikari in both years because NIL-GN1A Takanari had more spikelets m −2 but fewer filled spikelets and a lower grain weight. NIL-GN1A Takanari produced a lower grain yield of the second crop than Koshihikari because NIL-GN1A Takanari had fewer spikelets m −2 due to the fewer panicles. Also, NIL-GN1A Takanari had a lower NSC content than Koshihikari due to the lower leaf sheath plus stem weight in the stubble in 2019. Thus, the lower grain yield in the second crop of NIL-GN1A Takanari may result from the lower NSC content in the stubble. Additionally, the ability to produce more spikelets per unit area of NIL-GN1A Takanari was not demonstrated in ratoon crop under the condition of low NSC content in the stubble.

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Section: Discussionmentioning

confidence: 99%

Nonstructural carbohydrate content in the stubble per unit area regulates grain yield of the second crop in rice ratooning

2022

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“…It has been widely reported that RC has a much shorter growth duration and thus requires less labor input, water, pesticide and associated production costs on land preparation, transplanting and crop maintenance as compared with MC 10,11 . Grain yield of RC has increased dramatically during the past few years due to the use of improved cultivars, intensive input of agronomic inputs and improvement of agricultural technology 12‐15 . Meanwhile, with the improvements in economic development and living standards, improving grain quality has become a priority next to yield in ratoon rice production 1,16 …”

Section: Introductionmentioning

confidence: 99%

“…In addition, MC of rice ratooning system has been traditionally harvested manually, requiring a large amount of labor input, which is becoming increasingly scarce and expensive 12,29 . Therefore, a mechanized rice ratooning system with MC harvested mechanically has been developed and quickly adopted by farmers in central China, especially in Hubei Province 15,29 . However, no detailed information on rice grain quality of MC and RC in the mechanized rice ratooning system across multiple locations has been reported.…”

Section: Introductionmentioning

confidence: 99%

On‐farm comparison in grain quality between main and ratoon crops of ratoon rice in Hubei Province, Central China

Yuan

Yang

et al. 2022

J Sci Food Agric

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BACKGROUND: While ratoon rice has been increasingly practiced by farmers recently in China, on-farm performance in grain quality of main and ratoon crops in the mechanized rice ratooning system is less studied and remains poorly understood. Therefore, a multi-location on-farm survey was conducted to collect rice grain samples from farmers' fields to determine grain quality of main and ratoon crops of ratoon rice at 12 locations across Hubei Province, central China, in 2016. RESULTS: On average, milled and head rice percentage in the ratoon crop was 70.2% and 65.7%, which was significantly higher than in the main crop, whereas chalky grain percentage and grain chalkiness in ratoon crop (10.1% and 2.8%, respectively) were significantly lower than those in the main crop (36.6% and 14.2%, respectively). The differences in these quality traits between the two crops were consistent at all locations. Averaged across 12 locations, scores of translucency and gel consistency were significantly lower but amylose content and alkali spreading value were significantly higher in the ratoon crop than in the main crop, with the difference between the two crops varying in gel consistency by location.CONCLUSION: Overall, grain quality, especially milling and appearance of the ratoon crop, was superior to the main crop in the mechanized rice ratooning system. As a result, this study emphasizes the potential role of the rice ratooning system in other regions with a similar biophysical background producing high-quality rice.

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“…Because achieving major breakthroughs in rice yield per unit area is difficult, developing ratoon rice comprising one plant with two harvest periods was an effective way to increase rice yield [6,7]. Ratoon rice is rice planted in such a way that dormant buds in the stubble survive after the main crop is harvested, and subsequently, regenerate into panicles [8]. The use of ratoon rice has been adopted in many countries [9].…”

Section: Introductionmentioning

confidence: 99%

Reasonable Nitrogen Regime in the Main Crop Increased Grain Yields in Both Main and Ratoon Rice

Zhang

Liu

et al. 2022

Agriculture

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Planting ratoon rice can realize one sowing and two harvests, which is of great significance for improving grain yield. However, the effects of nitrogen (N) regime in the main crop on the grain yield of ratoon rice and the associated physiological mechanisms are not clearly understood. The indica hybrid rice Liangyou 6326 was used, and three N fertilizer levels (100 kg ha−1 (low N, LN), 250 kg ha−1 (medium N, MN), and 400 kg ha−1 (high N, HN)) and four different ratios of basal tillering fertilizer to panicle fertilizer (7:3, 6:4, 5:5, and 4:6) applied to the main crop were designed to investigate their effects on the grain yields of the main and ratoon crops. The results showed that excessive N application rate and panicle N application rate in the main crop was not conducive to the improvement of yield and agronomic nitrogen use efficiency (ANUE) in both seasons. The increased yield in the ratoon crop was attributed to the increase in the regeneration rate. Appropriate increasing of the panicle N application rate was beneficial for increasing the ROA and NSC concentration in the main crop, resulting in an increase in the number, length, and fresh weight of regenerated buds, which caused an improvement in the regeneration rate. However, when excessive panicle N was applied in the main crop, the excessive germination of regenerated buds decreased the length and fresh weight of the regenerated bud and resulted in a decrease in the regeneration rate. These results suggest that in the production of ratoon rice, reasonable N regime in the main crop could increase the yield and ANUE in both seasons.

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Agronomic and physiological characteristics of high‐yielding ratoon rice varieties

Cited by 17 publications

References 36 publications

Nonstructural carbohydrate content in the stubble per unit area regulates grain yield of the second crop in rice ratooning

Nonstructural carbohydrate content in the stubble per unit area regulates grain yield of the second crop in rice ratooning

On‐farm comparison in grain quality between main and ratoon crops of ratoon rice in Hubei Province, Central China

Reasonable Nitrogen Regime in the Main Crop Increased Grain Yields in Both Main and Ratoon Rice

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