scholarly journals Effects of Gibberellic Acid Application after Anthesis on Seed Vigor of Indica Hybrid Rice (Oryza sativa L.)

Agronomy ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 861
Author(s):  
Xiaomin Wang ◽  
Huabin Zheng ◽  
Qiyuan Tang ◽  
Wenwei Mo ◽  
Junjie Ma
Keyword(s):  
Gibberellic Acid ◽  
Seed Production ◽  
Seed Yield ◽  
Field Experiments ◽  
Hybrid Rice ◽  
Seed Vigor ◽  
Rice Seed ◽  
Germination Test ◽  
Vigor Index ◽  
Indica Hybrid Rice

Gibberellic acid (GA3) application after anthesis is an important practice in hybrid rice seed production, and it plays diverse roles in seed quality and seed yield. The main objective of this study was to determine (1) the effects of GA3 application after anthesis on seed vigor and (2) the optimal GA3 dosage applied to Indica hybrid rice seed production. Field experiments of different GA3 dosages (15 g hm−2 and 30 g hm−2, respectively) after anthesis were conducted in 2016 and 2017, and seed vigor parameters, stigma vigor index, and seed yield were determined. We found that significant differences in seed vigor parameters by a standard germination test and a cool germination test were observed among different GA3 dosages after anthesis. Compared with the water spraying treatment, the germination percentage (GP) increased by 2.5–6.3%, and the vigor index (VI) increased by 8.9–19.8% from GA3 application after anthesis, respectively. Moreover, the stigma vigor index of the female parent was enhanced with an increasing GA3 dosage, and there were significant increases (7.5–16.0%) between the water spraying treatment and GA3 spraying treatments. There were positive significant relationships between the VI and stigma vigor index. Additionally, the seed yield of the GA3 application with 30 g hm−2 was 3.9% higher on average than that of the water spraying treatment. Therefore, our study suggests that seed vigor can be increased by GA3 application after anthesis, and GA3 application should be applied at a rate of 30 g hm−2 to improve seed vigor and maintain seed yield in Indica hybrid rice seed production.

scholarly journals Assessment of yield and physiological parameters in (KRH-2) hybrid rice seed production (A×R) by using exogenous gibberellic acid

2015 ◽  
Vol 10 (2) ◽  
pp. 113-117 ◽  
Author(s):  
M. CHANDRA NAIK ◽  
M.K. MEENA ◽  
T.C. SUMA ◽  
VASUDEV PALTHE ◽  
SREEDEVI S. CHAVAN ◽  
...  
Keyword(s):  
Gibberellic Acid ◽  
Seed Production ◽  
Hybrid Rice ◽  
Physiological Parameters ◽  
Rice Seed

scholarly journals Hybrid rice development in Indonesia: constraints and opportunities

2021 ◽  
Vol 306 ◽  
pp. 01047
Author(s):  
Satoto ◽  
Yuni Widyastuti
Keyword(s):  
Seed Production ◽  
Seed Yield ◽  
Hybrid Rice ◽  
Hybrid Seed ◽  
Rice Seed ◽  
Hybrid Seed Production ◽  
Rice Varieties ◽  
Private Companies ◽  
Climatic Fluctuations ◽  
Seed Grower

This paper reviews the constraints and opportunities of hybrid rice development in Indonesia. Indonesia has released more than a hundred hybrid rice varieties; Indonesian Center for Rice Research (ICRR) developed 21 varieties. Extensive trials were conducted on the various aspects of seed production by government sectors and private companies. Significant progress has been made in hybrid rice seed production, with seed yield increasing from 1 t/ha to 3 t/ha. Various problems should be considered to develop a good seed production system. The constraints are the low outcrossing rate, shortage of suitable land, high cost and labor, lack of trained personnel, climatic fluctuations in rainfall and temperature, and limited hybrid rice seed grower. Private sectors investment in hybrid rice has been increased. Positive support from government and private companies will boost hybrid rice’s adoption rapidity. Collaboration of hybrid rice dissemination across institutions was a meaningful way to encourage hybrid rice adoption. Optimizing seed production technologies could significantly increase the present level of hybrid seed yield. The opportunities are an increase of rice demand, various materials genetic, distribution of rice ecosystem, and public-private sector partnership that developed on hybrid seed production to accelerate the adoption of hybrid rice. It supports not only the research and development but also the dissemination and adoption.

scholarly journals Genotypic Variation in Nutrient Uptake Requirements of Rice Using the QUEFTS Model

Agronomy ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 26
Author(s):  
Tao Sun ◽  
Xin Yang ◽  
Sheng Tang ◽  
Kefeng Han ◽  
Ping He ◽  
...  
Keyword(s):  
Nutrient Uptake ◽  
Field Experiments ◽  
Hybrid Rice ◽  
Genotypic Variation ◽  
Tropical Soils ◽  
Study Data ◽  
Japonica Rice ◽  
Rice Varieties ◽  
Indica Hybrid Rice ◽  
Validation Experiments

Nutrient requirements for single-season rice using the quantitative evaluation of the fertility of tropical soils (QUEFTS) model in China have been estimated in a previous study, which involved all the rice varieties; however, it is unclear whether a similar result can be obtained for different rice varieties. In this study, data were collected from field experiments conducted from 2016 to 2019 in Zhejiang Province, China. The dataset was separated into two parts: japonica/indica hybrid rice and japonica rice. To produce 1000 kg of grain, 13.5 kg N, 3.6 kg P, and 20.4 kg K were required in the above-ground plant dry matter for japonica/indica hybrid rice, and the corresponding internal efficiencies (IEs) were 74.0 kg grain per kg N, 279.1 kg grain per kg P, and 49.1 kg grain per kg K. For japonica rice, 17.6 kg N, 4.1 kg P, and 23.0 kg K were required to produce 1000 kg of grain, and the corresponding IEs were 56.8 kg grain per kg N, 244.6 kg grain per kg P, and 43.5 kg grain per kg K. Field validation experiments indicated that the QUEFTS model could be used to estimate nutrient uptake of different rice varieties. We suggest that variety should be taken into consideration when estimating nutrient uptake for rice using the QUEFTS model, which would improve this model.

scholarly journals Detection of QTLs for Outcrossing-Related Traits in CSSL Population Derived from Primitive Japonica Accession Ludao in the Genetic Background of O. sativa spp. Japonica Restorer C-bao Using RSTEP-LRT Method

Agronomy ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 28
Author(s):  
Lal Bux ◽  
Dalu Li ◽  
Muhammad Faheem ◽  
Nour Ali ◽  
Muzafar Hussain Sirohi ◽  
...  
Keyword(s):  
Seed Production ◽  
Hybrid Rice ◽  
Oryza Sativa L ◽  
Flag Leaf ◽  
Leaf Angle ◽  
Ratio Test ◽  
Phenotypic Variance ◽  
Rice Seed ◽  
Hybrid Seed Production ◽  
Cms Line

The outcrossing traits in rice (Oryza sativa L.) affect the yield of hybrid seed production. Using a cytoplasmic male sterile (CMS) line with good outcrossing traits, such as short flag leaf length (FLL), narrow flag leaf width (FLW), wide flag leaf angle (FLA), and elongated panicle neck length (PNL), for hybrid rice seed production, it is possible to avoid the procedure of cutting flag leaves and make the supplementary pollination feasible by machine. In this study, a japonica restorer C-bao as the receptor parent and a primitive japonica accession Ludao as the donor parent were used to construct a chromosome segment substitution line (CSSL) population. The CSSL population was used to detect quantitative trait loci (QTLs) for the four outcrossing traits using a likelihood ratio test based on the stepwise regression (RSTEP-LRT) method. The CSSL population constructed consisted of 163 lines covering 90.7% of the donor genome. Among the seven QTLs detected in the CSSL population, four QTLs were detected in both years. qFLL-4 explained 6.70% of the two-year-averaged phenotypic variance, and the alleles from Ludao decreased FLL 5.1 cm. qFLA-1.1 and qFLA-1.2 explained 7.85% and 21.29% of the 2-year-averaged phenotypic variance respectively, and the alleles from Ludao increased FLA 17.38° and 31.50°. qPNL-8 explained 8.87% of the 2-year-averaged phenotypic variance, and the alleles from Ludao increased PNL 4.44 cm. These favorable alleles identified could be used to improve the outcrossing traits of parents for hybrid rice seed production in rice.

scholarly journals A method for mechanized hybrid rice seed production using female sterile rice

Rice ◽  
2019 ◽  
Vol 12 (1) ◽  
Author(s):  
Yumei Xia ◽  
Ning Tang ◽  
Yuanyi Hu ◽  
Ding Li ◽  
Shuangcheng Li ◽  
...  
Keyword(s):  
Seed Production ◽  
Hybrid Rice ◽  
Rice Seed

scholarly journals Fine-Tuning of Eui1: Breaking the Bottleneck in Hybrid Rice Seed Production

2018 ◽  
Vol 11 (5) ◽  
pp. 643-644 ◽  
Author(s):  
Shaopei Gao ◽  
Chengcai Chu
Keyword(s):  
Seed Production ◽  
Hybrid Rice ◽  
Fine Tuning ◽  
Rice Seed

Hybrid Rice Seed Production

10.1142/7631 ◽  
2011 ◽  
Author(s):  
Shihua Cheng ◽  
Liyong Cao ◽  
Haipeng Zhou
Keyword(s):  
Seed Production ◽  
Hybrid Rice ◽  
Rice Seed

scholarly journals Enhancing Seed Yield of Hybrid Rice by Maintaining Row Ratio and Dosages of Gibberellic Acid

2017 ◽  
Vol 50 (1) ◽  
pp. 31-45
Author(s):  
M. Abo-Youssef ◽  
A. El Sabagh ◽  
G. Abo-Gendy ◽  
A. Mohamed
Keyword(s):  
Gibberellic Acid ◽  
Seed Yield ◽  
Seed Set ◽  
Hybrid Rice ◽  
Flag Leaf ◽  
Hybrid Seed Production ◽  
Panicle Length ◽  
Growing Seasons ◽  
Main Plot ◽  
Panicle Weight

Abstract The purpose of this study was to identify the optimum levels of gibberellic acid and suitable row ratio for maximization the seed yield of hybrid rice. An experiment was conducted at the experimental farm of Rice Research and Training Center, Egypt, during 2013 and 2014 growing seasons. The material under this study included the parental lines of IR69625A (Female lines) and Giza 179 R (Restorer line) to produce F0 hybrid seeds. A split-plot design with three replications was used. The main plot was row ratio (2R:8A, 2R:10A and 2R:12A) and sub plots was the doses of gibberellic acid (g/ha) (control, 300, 350, 400). The results indicated that, Application of GA3 and row ratio had significant effect on different traits of seed yield and hybrid seed production. The highest values of flag leaf area, panicle length, seed set, panicle weight, panicle exsertion and seed yield were acheived by using 2R: 8A row ratio and was observed the lowest values were obtained at the 2:12 row ratio. Acoording to gibberellic acid application, the highest values for panicle length (cm), seed set (%), panicle weight (g), panicle exertion (%), harvest index and seed yield were recorded by using 400 g /ha gibberellic acid. Accordingly, the highest net economic return from seed yield was obtained with the treatment combination of 400 g/ha GA3 x 2:8 (R: A) row ratio.

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