Analysis on Dry Matter Production Characteristics of Super Hybrid Rice

Wu, Wenge; Zhang, Hongcheng; Qian, Ying-fei; Cheng, Yongqiang; Wu, Gui-Cheng; Zhai, Chao-qun; Dai, Qigen

doi:10.1016/s1672-6308(08)60028-1

Cited by 21 publications

(17 citation statements)

References 3 publications

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“…Because the NAR data in the present study were calculated from transplanting to heading stages, the yield advantage of modern super rice was mainly attributed to biomass accumulation after flowering. Wu et al (2007) reported that grain yield of super rice was not significantly correlated with biomass accumulation before flowering, but it had an outstanding positive linear correlation to biomass accumulation after flowering. In this context, our study does not offer solution to the conflict.…”

Section: Discussionmentioning

confidence: 98%

Optimization of leaf properties and plant phenotype through yield‐based genetic improvement of rice over a period of seventy years in the Yangtze River Basin of China

Zhu

Ren

Liu

et al. 2020

Food and Energy Security

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Knowledge of changes associated with the progression of growth‐related characteristics in rice plant is essential to make strategies for future breeding and crop management. However, thus far, little attention has been given to the identification of temporal changes of the traits concomitant with the year of release in rice genetic breeding. The objective of this study was to explore genetic gain for yield accrued in association with evolution of the growth phenotypes in a 2‐year field experiment conducted on the Yangtze River Basin of China. Fifteen rice (Oryza sativa L.) cultivars, including 5 super high‐yielding rice, bred or widely cultivated from 1936 to 2005, were grown in irrigated field conditions with appropriate doses of commercial fertilizers during the rice‐growing season from May to October in 2013 and 2014. In both years, SPAD reading was high during vegetative and early grain filling stages, but it declined sharply at maturity. In general, SPAD reading increased with the progression in year of release of the cultivars and it correlated with yield benefit accrued. Similar to SPAD, the evolutionary trend also accounted for significant increases in LAI (leaf area index) and SLW (specific leaf weight), CGR (crop growth rate), LAD (leaf area duration), S/LA (spikelets/leaf area), and NAR (net assimilation rate). All growth parameters, except NAR, correlated positively with grain yield. Conversely, K (extinction coefficient) exhibited significant decline along with year of release, meaning more erect canopies. Gain of SLW in the newer cultivars enabled better light energy interception probably with higher RUE, which associated with increased SPAD amounting to low K values. It was opined that the reduced K improved light distribution across the leaves, which contributed to a grain yield advantage through increase of sink size (S/LA) over the 70‐year period.

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Section: Discussionmentioning

confidence: 98%

Optimization of leaf properties and plant phenotype through yield‐based genetic improvement of rice over a period of seventy years in the Yangtze River Basin of China

Zhu

Ren

Liu

et al. 2020

Food and Energy Security

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“…This result confirms the findings of Yan et al [ 22 ]. Yang et al [ 53 ]; Yang et al [ 8 ]; and Wu et al [ 28 ] reported that the more dry matter in the vegetative organ at heading contributes little to the grain due to poor transportation and remobilization of stored assimilates and these account for poor grain filling rather than source limitation in super- and intersubspecific hybrids. Large sink size or sink strength of hybrids creating higher demand for photosynthetic assimilates increased photosynthetic rate in flag leaf initially at delayed planting.…”

Section: Discussionmentioning

confidence: 99%

“…Chlorophyll content reflects the intensity of plant photosynthetic capacity and the extent of leaf senescence [ 24 ]. Slow senescence and stronger photosynthetic capability of flag leaf, higher LAI at grain filling period, and higher postheading-CGR are the prerequisites for higher yield in hybrid rice [ 25 – 28 ]. The postanthesis decline in leaf area at specially the ripening stage was higher in the hybrid compared to the inbred [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

Comparative Performance of Hybrid and Elite Inbred Rice Varieties with respect to Their Source-Sink Relationship

Haque

Pramanik

Biswas

et al. 2015

The Scientific World Journal

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Hybrid rice varieties have higher yield potential over inbred varieties. This improvement is not always translated to the grain yield and its physiological causes are still unclear. In order to clarify it, two field experiments were conducted including two popular indica hybrids (BRRI hybrid dhan2 and Heera2) and one elite inbred (BRRI dhan45) rice varieties. Leaf area index, chlorophyll status, and photosynthetic rate of flag leaf, postheading crop growth rate, shoot reserve translocation, source-sink relation and yield, and its attributes of each variety were comprehensively analyzed. Both hybrid varieties outyielded the inbred. However, the hybrids and inbred varieties exhibited statistically identical yield in late planting. Both hybrids accumulated higher amount of biomass before heading and exhibited greater remobilization of assimilates to the grain in early plantings compared to the inbred variety. Filled grain (%) declined significantly at delayed planting in the hybrids compared to elite inbred due to increased temperature impaired-inefficient transport of assimilates. Flag leaf photosynthesis parameters were higher in the hybrid varieties than those of the inbred variety. Results suggest that greater remobilization of shoot reserves to the grain rendered higher yield of hybrid rice varieties.

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“…The study of Thussagunpanit et al (2015) also showed that photosynthetic rate is one of the limiting factors in the yield formation of rice. Furthermore, the research of Wu et al (2008) revealed that the higher light intensity could enhance photosynthetic rate and increase the dry matter accumulation and finally improve the grain yield of rice. Therefore, photosynthesis is a key part in aroma rice production to improve fragrant rice yield and ensure the yield stability.…”

Section: Introductionmentioning

confidence: 99%

Foliar application of selenium (Se) at heading stage induces regulation of photosynthesis, yield formation, and quality characteristics in fragrant rice

Luo¹,

He²,

Du³

et al. 2019

Photosynt.

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In order to study the effect of foliar application of sodium selenate on fragrant rice performance at the heading stage, the present study was conducted with two fragrant rice cultivars, 'Meixiangzhan-2' and 'Xiangyaxiangzhan'. At the heading stage, six concentrations of sodium selenate solution (0, 10, 20, 30, 40, and 50 μmol L-1) were sprinkled to plants. Our results showed that foliar application of sodium selenate increased chlorophyll contents in rice leaves and upregulated net photosynthetic rate at the grain-filling stage. The enhancement was observed in grain yield, seed-setting rate, and in 1,000-grain mass. The highest yield and net photosynthetic rate were both recorded at 40 μmol L-1 treatment for both cultivars. Furthermore, foliar application of sodium selenate also improved some grain quality attributes, such as head rice rate and crude protein content. The Se concentration in fragrant rice grain also increased due to sodium selenate application. In conclusion, sodium selenate has potential to be the exogenous plant growth regulator in fragrant rice production to increase yield and quality.

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Analysis on Dry Matter Production Characteristics of Super Hybrid Rice

Cited by 21 publications

References 3 publications

Optimization of leaf properties and plant phenotype through yield‐based genetic improvement of rice over a period of seventy years in the Yangtze River Basin of China

Optimization of leaf properties and plant phenotype through yield‐based genetic improvement of rice over a period of seventy years in the Yangtze River Basin of China

Comparative Performance of Hybrid and Elite Inbred Rice Varieties with respect to Their Source-Sink Relationship

Foliar application of selenium (Se) at heading stage induces regulation of photosynthesis, yield formation, and quality characteristics in fragrant rice

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