Genotypic association between grain yield and six agronomic traits in a cross between rice varieties of contrasting plant type

Euphytica ◽  
1970 ◽  
Vol 19 (3) ◽  
pp. 356-363 ◽  
Author(s):  
T. T. Chang ◽  
O. Tagumpay
Keyword(s):  
Grain Yield ◽  
Agronomic Traits ◽  
Plant Type ◽  
Rice Varieties ◽  
Genotypic Association

scholarly journals Genome-wide association study for yield and yield related traits under reproductive stage drought in a diverse indica-aus rice panel

2020 ◽  
Author(s):  
Aditi Bhandari ◽  
Nitika Sandhu ◽  
Jérôme Bartholome ◽  
Tuong-Vi Cao-Hamadoun ◽  
Nourollah Ahmadi ◽  
...  
Keyword(s):  
Grain Yield ◽  
Field Experiments ◽  
Genome Wide Association Study ◽  
Agronomic Traits ◽  
Reproductive Stage ◽  
Phenotypic Variance ◽  
Rice Varieties ◽  
Drought Tolerant ◽  
Genome Wide ◽  
Genomic Regions

Abstract Background Reproductive-stage drought stress is a major impediment to rice production in rainfed areas. Conventional and marker-assisted breeding strategies for developing drought-tolerant rice varieties are being optimized by mining and exploiting adaptive traits, genetic diversity; identifying the alleles, and understanding their interactions with genetic backgrounds for their increased contribution to drought tolerance. Field experiments were conducted in this study to identify marker-trait associations (MTAs) involved in response to yield under reproductive-stage (RS) drought. A diverse set of 280 indica-aus accessions was phenotyped for ten agronomic traits including yield and yield-related traits under normal irrigated condition and under two managed reproductive-stage drought environments. The accessions were genotyped with 215,250 single nucleotide polymorphism markers. Results The study identified a total of 219 significant MTAs for 10 traits and candidate gene analysis within a 200kb window centred from GWAS identified SNP peaks detected these MTAs within/ in close proximity to 38 genes, 4 earlier reported major grain yield QTLs and 6 novel QTLs for 7 traits out of the 10. The significant MTAs were mainly located on chromosomes 1, 2, 5, 6, 9, 11 and 12 and the percent phenotypic variance captured for these traits ranged from 5 to 88%. The significant positive correlation of grain yield with yield-related and other agronomic traits except for flowering time, observed under different environments point towards their contribution in improving rice yield under drought. Seven promising accessions were identified for use in future genomics-assisted breeding programs targeting grain yield improvement under drought. Conclusion These results provide a promising insight into the complex genetic architecture of grain yield under reproductive-stage drought in different environments. Validation of major genomic regions reported in the study will enable their effectiveness to develop drought-tolerant varieties following marker-assisted selection as well as to identify genes and understanding the associated physiological mechanisms.

The response to row spacing of two tropical rice varieties of contrasting plant type

1968 ◽  
Vol 8 (34) ◽  
pp. 582 ◽  
Author(s):  
PC Owen
Keyword(s):  
Grain Yield ◽  
Leaf Area ◽  
Vegetative Growth ◽  
Unit Area ◽  
Row Spacing ◽  
Northern Australia ◽  
Plant Type ◽  
Wet Season ◽  
Rice Varieties ◽  
Tropical Conditions

The growth of two rice varieties of contrasting plant type and of different origin was compared at two row spacings under wet season tropical conditions in northern Australia. The short, erect-leaved variety SML 81b responded to the closer spacing by producing fewer tillers and a smaller leaf area per plant during active vegetative growth. The tropical leafy variety Sircna did not exhibit any compensatory reduction of the growth of individual plants, and dense crop growth and high leaf area indices resulted at the closer spacing. The heavy vegetative growth of Sircna was not reflected in grain yield at harvest, while the higher tiller number per unit area of SML 81b resulted in a higher grain yield at the closer spacing. The agricultural implications of the results are discussed.

scholarly journals Analysis of Combining Ability in Rice Varieties for Quantitative Traits

2019 ◽  
Vol 11 (3) ◽  
pp. 436-439
Author(s):  
Ghaffar KIANI
Keyword(s):  
Grain Yield ◽  
Combining Ability ◽  
Agronomic Traits ◽  
Block Design ◽  
Rice Varieties ◽  
Gene Effects ◽  
Breeding Programs ◽  
Grain Length ◽  
Additive Gene Effects ◽  
Additive Gene

Rice is staple food in Iran. Despite of high quality of local rice, their grain yield is low. In hybridization breeding programs, selection of suitable parents is an essential role for developing new combinations with broadens genetic diversity. Combining ability of local rice varieties namely ‘Hashemi’, ‘Sang Jo’ and ‘Tarom Deylamani’ and ‘Nemat’ was evaluated in a partial diallele analysis for agronomic traits in a randomized complete block design at Sari Agricultural Sciences and Natural Resources University. General combining ability (GCA) and specific combining ability (SCA) variances showed predominated role of additive gene effects in the inheritance of grain length. Both additive and non-additive components of genetic variances were important in the inheritance of traits like grain yield, plant height, panicle length, total grains per panicle, grain length and grain length to width. However, non-additive gene effects were seen for tiller number. Results showed that ‘Nemat’ was the best general combiner for most of characters followed by ‘Tarom Deylamani’. The cross of ‘Hashemi’ × ‘Tarom Deylamani’ was suggested to exploitation of heterosis breeding for increasing yield and its components in rice breeding programs. 

scholarly journals Assessment phenotypic diversity of rice (Oryza sativa L.) genotypes by multivariate analysis

2021 ◽  
pp. 52-59
Author(s):  
Khaled F.M. Salem ◽  
Maysoun M Saleh ◽  
Laila Aldahak ◽  
Abdelmoaty B. Elabd
Keyword(s):  
Grain Yield ◽  
Agronomic Traits ◽  
Phenotypic Diversity ◽  
Oryza Sativa L ◽  
Rice Varieties ◽  
Plant Variation ◽  
Training Centre ◽  
Rice Genotypes ◽  
And Cluster Analysis ◽  
Analytical Approaches

An efficient way to achieve superior productivity is to determine the genetic variation of the various rice genotypes. This research was aimed at estimating potential variations between rice genotypes and identifying each trait contribution in total variation and classifying superior genotypes. The experiment was performed at the Rice Research and Training Centre, Sakha, Kafr El-Sheik, Egypt. Twenty-two genotypes of rice were analyzed using seven agronomic traits. Multivariate approaches were utilized including principal components and cluster analysis. Results showed that PC1 and PC2 represented 66.1% of the variation between studied genotypes, mainly 48% because of grain yield per plant variation in PC1 followed by the characteristics of its components i.e., number of panicles per plant, number of filled grains per panicle, and 1000-grain weight. The three Egyptian rice genotypes Giza 181, Giza 178, and Giza 177 were the best genotypes for grain yield. Cluster results revealed that the majority of genotypes originated from one source (except for Indian variety IET1444) or belonged to one classification were clustered together. Multivariate analytical approaches are ideal instruments for providing information on agronomic character variations. Consequently, the results of the current study should be taken into account when developing new rice varieties.   

scholarly journals Optimization of Nitrogen Fertilization and Seedling Density of A New Rice Type (Oryza sativa L.) “IPB 3S”

2017 ◽  
Vol 4 (3) ◽  
pp. 94-101
Author(s):  
Sugiyanta Sugiyanta ◽  
Galih Angga Kusuma
Keyword(s):  
Grain Yield ◽  
Nitrogen Fertilization ◽  
Oryza Sativa L ◽  
Rice Seedling ◽  
Growth And Yield ◽  
Optimum Dose ◽  
Seedling Density ◽  
Plant Type ◽  
Rice Varieties ◽  
Rate Of Photosynthesis

The new plant type of rice, or ‘padi tipe baru’ (PTB) in Indonesian, is a new group of rice cultivars with a higher productivity compared to the modern rice varieties (‘varietas unggul baru’ or VUB). This study was conducted to determine the optimum dose of nitrogen fertilization and the seedling density or number of seedlings per hill to increase growth and yield of the new type of rice “IPB 3”. The experiment was conducted in the Bogor Experimental Station  in January to June 2015.  Nitrogen doses (90, 120, 150, 180 kg N.ha-1) and number of seeds per hill (1, 5, 10, 15 and 20) were tested.  The results showed that the increased dose of nitrogen fertilizer reduced the percentage of filled grains, the rate of photosynthesis and the grain yield per hectare. Similarly, an increase in the seedling density up to 15 seeds decreased the dry matter of the crop, the number of grains per panicle, and grain weight per plant, but increased the grain yield per hectare. The optimum yield of “IPB 3S” was achieved with  90 kg N.ha-1 with 15 seeds per hill. The results of this study have provided a guideline for an improved nitrogen management in relation to rice seedling population to increase yield of a new rice type “IPB3S”.Keywords:  “IPB 3S”, new plant type, fertilizer, local variety

scholarly journals NH787 EMS mutant of rice variety Nagina22 exhibits higher phosphate use efficiency

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yugandhar Poli ◽  
Veronica Nallamothu ◽  
Ai Hao ◽  
Muddapuram Deeksha Goud ◽  
Xiaowen Wang ◽  
...  
Keyword(s):  
Grain Yield ◽  
Agronomic Traits ◽  
Wide Spectrum ◽  
Rice Variety ◽  
Rice Varieties ◽  
High Productivity ◽  
P Fertilizer ◽  
Vegetative Biomass ◽  
Use Efficiency ◽  
Phosphate Use Efficiency

AbstractRice (Oryza sativa L.), a major dietary source, is often cultivated in soils poor in available inorganic orthophosphate (Pi), which is a key nutrient for growth and development. Poor soils are amended by phosphorus (P) fertilizer, which is derived from the non-renewable rock phosphate reserves. Therefore, there is a need for developing rice varieties with high productivity under low P conditions. At the ICAR-IIRR, ethyl methanesulfonate (EMS) mutagenized rice genotype Nagina22 (N22) were screened for high grain yield in Pi-deprived soil, which led to the identification of ~ 10 gain-of-function mutants including NH787. Here, detailed comparative morphophysiological, biochemical, and molecular analyses of N22 and NH787 were carried out in hydroponics and potting soil under different Pi regimes. Under Pi-deprived condition, compared with N22, NH787 exhibited higher root and vegetative biomass, the number of tillers, and grain yield. The augmented agronomic traits of NH787 were corroborated with significantly higher photosynthetic rate, pollen fertility, stigma receptivity, and the activities of antioxidant enzymes superoxide dismutase (SOD) and catalase (CAT). Further, several genes involved in the maintenance of Pi homeostasis (GPH) were differentially regulated. The study thus revealed a wide-spectrum influence of the mutation in NH787 that contributed towards its higher Pi use efficiency (PUE).

scholarly journals Characterization of QTL for unique agronomic traits of new-plant-type rice varieties using introgression lines of IR64

2016 ◽  
Vol 4 (1) ◽  
pp. 12-20 ◽  
Author(s):  
Analiza G. Tagle ◽  
Daisuke Fujita ◽  
Leodegario A. Ebron ◽  
Mary Jeanie Telebanco-Yanoria ◽  
Kazuhiro Sasaki ◽  
...  
Keyword(s):  
Agronomic Traits ◽  
Introgression Lines ◽  
Plant Type ◽  
Rice Varieties

scholarly journals Identification of Drought Tolerant among MARDI Rice Varieties based on Morpho-Agronomic Traits and Drought Grain Yield QTLs

2021 ◽  
Vol 10 (8) ◽  
pp. 471-493
Author(s):  
Site Noorzuraini Binti Abd Rahman Mohd Shahril Firdaus Bin Abd Razak ◽  
Norlida Mohamed Hamim Mohd Ramdzan Bin Othman ◽  
Nur Idayu Binti Abd Rahim
Keyword(s):  
Grain Yield ◽  
Agronomic Traits ◽  
Rice Varieties ◽  
Drought Tolerant

scholarly journals Gain-of-Function NH787 Ethylmethanesulfonate Mutant of Nagina22 Rice Variety Confers Augmented PUE

2021 ◽  
Author(s):  
Poli Yugandhar ◽  
Nallamothu Veronica ◽  
Hao Ai ◽  
Muddapuram Deeksha Goud ◽  
Xiaowen Wang ◽  
...  
Keyword(s):  
Grain Yield ◽  
Agronomic Traits ◽  
Wide Spectrum ◽  
Rice Variety ◽  
Gain Of Function ◽  
Rice Varieties ◽  
High Productivity ◽  
P Fertilizer ◽  
Vegetative Biomass ◽  
Use Efficiency

Abstract Rice (Oryza sativa L.), a major dietary source, is often cultivated in soils poor in available inorganic orthophosphate (Pi), which is a pivotal nutrient for growth and development. Poor soils are amended by phosphorus (P) fertilizer, which is derived from the non-renewable rock phosphate reserves. Therefore, there is a need for developing rice varieties with high productivity under low P conditions. At the ICAR-IIRR, ethyl methanesulfonate (EMS) mutagenized rice genotype Nagina22 (N22) were screened for high grain yield in Pi-deprived soil, which led to the identification of ~10 gain-of-function mutants including NH787. Here, detailed comparative morphophysiological, biochemical, and molecular analyses of N22 and NH787 were carried out in hydroponics and potting soil under different Pi regimes. Under Pi-deprived conditions, compared with N22, NH787 exhibited higher root and vegetative biomass, the number of tillers, and grain yield. The augmented agronomic traits of NH787 were corroborated with significantly higher photosynthetic rate, pollen fertility, stigma receptivity, and the activities of antioxidant enzymes superoxide dismutase (SOD) and catalase (CAT). Further, several genes involved in the maintenance of Pi homeostasis (GPH) were differentially regulated. The study thus revealed a wide-spectrum influence of the mutation in NH787 that contributed towards its higher Pi use efficiency.

Yield performance with heritability measurements of half sib families obtained from maize variety Azam

1970 ◽  
pp. 33-36
Author(s):  
Faizan Mahmood, Hidayat- Ur-Rahman, Nazir Ahmad ◽  
Fahim-ul- Haq ◽  
Samrin Gul, Quaid Hussain ◽  
Ammara Khalid ◽  
Touheed Iqbal ◽  
...  
Keyword(s):  
Grain Yield ◽  
Agronomic Traits ◽  
Heritability Estimate ◽  
Kernel Weight ◽  
Yield Performance ◽  
Grain Moisture ◽  
Maize Variety ◽  
Ear Height ◽  
Sib Families

This study evaluated the performance of 64 half sib families (HSF) derived from “Azam” variety of maize using partially balanced lattice square design with two replications. Data were recorded on grain yield and other agronomic traits. Observations showed difference in half-sib families for studied traits. Among the 64 half-sib families, minimum days to 50% tasseling (51 days) were observed for HS-49 while maximum (57 days) for HS-63. Minimum days to 50% silking (56 days) were counted for HS-6 while maximum (63 days) for HS-23. Minimum days to 50% anthesis (55 days) were counted for HS-1 and HS-6 while maximum (62 days) for HS-23. Similarly, minimum ASI (-2 days) were observed in HS-1, HS-15, HS-16, HS-28 and HS-63 while maximum (2 days) in HS-48. Minimum (60 cm) ear height was recorded for HS-11 and maximum (93.5 cm) for HS-28. Minimum fresh ear weight (1.3 kg) was weighted for HS-17 while maximum (3.2 kg) for HS-21. Grain moisture was recorded minimum (19.35 %) for HS-19 and maximum (31.25%) for HS-2. HS-42 showed minimum (28 g) 100 kernel weight while HS-5 showed maximum (47 g). Grain yield was minimum (2323 kg ha-1) for HS-17 and maximum (5742 kg ha-1) for HS-21. Maximum heritability estimate (0.92) was recorded for fresh ear weight, while minimum (0.41) was observed for ear height.

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