scholarly journals Combining ability and heterosis studies for grain yield and its components in hybrid rice (Oryza sativa L.)

2018 ◽  
Vol 9 (1) ◽  
pp. 244
Author(s):  
K. Parimala ◽  
D. Bhadru ◽  
Ch. Surender Raju
Keyword(s):  
Oryza Sativa ◽  
Grain Yield ◽  
Combining Ability ◽  
Hybrid Rice ◽  
Oryza Sativa L

scholarly journals Combining Ability and Heterosis for Grain Yield and its Component Traits in Rice(Oryza sativa L.)

2013 ◽  
Vol 5 (1) ◽  
pp. 90-97 ◽  
Author(s):  
Srikrishna LATHA ◽  
Deepak SHARMA ◽  
Gulzar S. SANGHERA
Keyword(s):  
Oryza Sativa ◽  
Grain Yield ◽  
Analysis Of Variance ◽  
Combining Ability ◽  
Oryza Sativa L ◽  
F1 Hybrids ◽  
Component Traits ◽  
Standard Heterosis ◽  
High Degree ◽  
Yield Trials

The nature and magnitude of heterosis and combining ability was studied in 18 F1 hybrids involving three CMS lines and six testers using line × tester analysis. The analysis of variance for combining ability of all the traits showed that variances due to treatments, parents, hybrids were highly significant. The line ‘CRMS 32A’ and testers viz. ‘Super rice-8’, ‘R 1099-2569-1-1’ and ‘Jitpiti’ were identified as good general combiners. The significant differences between lines x testers interaction indicates that SCA attributed heavily in the expression of these traits and demonstrates the importance of dominance or non additive variances for all the traits. The hybrid ‘CRMS 32A’/‘R 1099-2569-1-1’ and ‘APMS 6A’/‘Super rice-8’ were promising for grain yield. The magnitude of relative heterosis, heterobeltiosis and standard heterosis were also estimated for different characters. A high degree of relative heterosis was observed for grain yield (20.45- 82.37%) in the hybrids viz., ‘CRMS 32A’/‘Super rice-8’, ‘APMS 6A’/‘Super rice-8’, ‘APMS 6A’/‘Jitpiti’ and ‘CRMS 32A’/‘R 1099-2569-1-1’. While, a higher degree of: heterobeltiosis (13.60 -68.37%) was observed for grain yield in the hybrids viz., ‘CRMS 32A’/‘Super rice-8’, ‘CRMS 32A’/‘R 1099-2569-1-1’, ‘APMS 6A’/’Super rice-8’ and ‘APMS 6A’/’Jitpiti’. A high degree of standard heterosis was observed for grain yield in the hybrid ‘CRMS 32A’/‘R 1099-2569-1-1’. The hybrid ‘CRMS 32A’/ ‘R 1099-2569-1-1’ recorded a high degree of relative heterosis (62.01%), heterobeltiosis (57.35%) and standard heterosis (15.05 and 25.51% over check hybrids, ‘Mahamaya’ and ‘Indirasona’, respectively) that can be tested on yield trials for its further testing over locations.

scholarly journals COMBINING ABILITY EFFECTS AND PER-SE PERFORMANCES OF MORPHO REPRODUCTIVE TRAITS IN RICE (Oryza sativa L.)

2015 ◽  
Vol 26 (2) ◽  
pp. 23-32
Author(s):  
M. A. Islam ◽  
M. A. K. Mian ◽  
M. G. Rasul ◽  
Q. A. Khaliq ◽  
M. K. Bashar
Keyword(s):  
Oryza Sativa ◽  
Grain Yield ◽  
Plant Breeding ◽  
Plant Height ◽  
Combining Ability ◽  
Oryza Sativa L ◽  
Reproductive Traits ◽  
Negative Effects ◽  
Mean Values ◽  
Per Se

To study combining ability effects of developed CMS and restorer lines an experiment was carried out at the experimental farm, Department of Genetics and Plant Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Salna, Gazipur during Aman 2011 and Boro 2011-12 following RCBD design through line × tester analysis in three replications. Five known CMS lines and sixteen developed Restorer lines were considered for through line × tester analysis. Among sixteen restorer lines, only four showed significant negative GCA effects for all these three traits for earliness. The estimated of gca effects of parents indicated that seven parents and sixteen crosses contributed highly significant negative effects for plant height which were responsible for dwarfing character. Fifteen crosses and eight parents showed significant negative sca estimates for days to first flowering and twenty crosses for maturity. Considering both SCA effects and per se performances for days to 1st flowering and maturity; the crosses of IR 58025A with RG-BU08-005R, RG-BU08-006R, RG-BU08-016R, RG-BU08-018R and RG-BU08-025R were found as the best specific combiner. Among 80 crosses fifty two crosses showed significant positive SCA effects along with above average perse performances for grain yield. Ten crosses of IR 58025A, seven crosses of GAN46A, fourteen crosses of IR 62829A, nine crosses of IR 68888A and ten crosses of BRRI 1A showed significant positive SCA effects along with mean values resulting significant positive SCA effects and above average perse performances with all five CMS lines for grain yield.

scholarly journals Combining ability studies for yield, associated traits and quality attributes in rice for South Gujarat (Oryza sativa L.)

2017 ◽  
Vol 9 (1) ◽  
pp. 60-67
Author(s):  
Navin Chander Gahtyari ◽  
P. I. Patel ◽  
Rakesh Choudhary ◽  
Sudhir Kumar ◽  
Naveen Kumar ◽  
...  
Keyword(s):  
Oryza Sativa ◽  
Grain Yield ◽  
Plant Height ◽  
Combining Ability ◽  
Amylose Content ◽  
Oryza Sativa L ◽  
Block Design ◽  
General Combining Ability ◽  
Specific Combining Ability ◽  
Kernel Length

Line x tester analysis using a set of four females, ten males and their forty hybrids was carried out to esti-mate the general combining ability of parents and specific combining ability of hybrids for yield and ten other associ-ated components in rice (Oryza sativa L.) in a Randomized Block Design during Kharif 2011. GCA variances for females (s2f) were significant at 0.1% level of significance for plant height (40.8), no. of grains per panicle (505.9), grain yield per plant (29.1), test weight(17.9), straw yield per plant (61.3) and kernel L/B ratio (0.2) whereas specific combining ability (SCA) variances for f x m interactions were highly significant for all the characters. Non-additive gene action was prevalent in all characters (Range: 0.03 in amylose content to 0.88 in kernel length breadth ratio) except plant height (1.33) as evident by low GCA to SCA ratio. None of the parents were good general combiner for all traits, however, female IR-28 and male AMT-119 and PNR-546 were good general combiners for a maximum number of traits i.e. five traits out of eleven.. The general combining ability for grain yield per plant for female parent Gurjari (6.19) and NVSR-178 (5.29); and male parents AMT 119 (2.73) and PNR 546 (2.44) makes them a good choice for improving yields in a hybridization programme as these female and male parents are also having signifi-cant GCA effects for maximum number of yield associated traits i.e. four and five traits out of eleven for female and male parents respectively. A vis-à-vis comparison of top three specific combining ability crosses with their mean performance showed correlation and these crosses were having at least one good general combining ability parent.

scholarly journals Combining ability and heterosis prediction for grain yield of parental lines and hybrids for heat tolerance in rice (Oryza sativa L.)

2017 ◽  
Vol 12 (Special-5) ◽  
pp. 1213-1221
Author(s):  
N. SRAVAN RAJU ◽  
P. SENGUTTUVEL ◽  
A.S. HARI PRASAD ◽  
P. BEULAH ◽  
P. NAGANNA ◽  
...  
Keyword(s):  
Oryza Sativa ◽  
Grain Yield ◽  
Heat Tolerance ◽  
Combining Ability ◽  
Oryza Sativa L ◽  
Heterosis Prediction ◽  
Parental Lines

scholarly journals Productivity and nutrient use efficiency of hybrid rice (Oryza sativa L.) in response to integrated use of organic and inorganic sources of nutrients

2021 ◽  
Vol 17 (2) ◽  
pp. 390-403
Author(s):  
Dinesh Pandey ◽  
Anjum Ahmad ◽  
J.K. Chauhan ◽  
N. Pandey
Keyword(s):  
Growth Rate ◽  
Oryza Sativa ◽  
Grain Yield ◽  
Dry Matter ◽  
Hybrid Rice ◽  
Oryza Sativa L ◽  
Nutrient Use Efficiency ◽  
Inorganic Fertilizer ◽  
Nutrient Use ◽  
Use Efficiency

An experiment was carried out during the Kharif 2002 and 2003, to study the productivity and nutrient use efficiency of hybrid rice (Oryza sativa L.) in response to integrated use of organic and inorganic sources of nutrients at Research farm, IGAU, Raipur (CG). In all 12 treatments, comprising of different N, P and K levels and its conjunction with organic fertilizers were laid out in Randomized Block Design with 3 replications. The results revealed that application of inorganic fertilizer level of 150:80:60 kg NPK ha-1 significantly increased number of active leaf, leaf area, leaf area index and dry matter accumulation at later stages as compared to lower level of inorganic fertilizer. The conjunction of 100:60:40 kg NPK ha-1 along with PM or N blended with CDU found to be equally effective to that of inorganic fertilizer level of 150:80:60 kg NPK ha-1 for above growth parameters. The chlorophyll content during crop period under above level was the highest under said treatment. The highest crop growth rate was observed between 60-90 DAT followed by 90 DAT-harvest and 30-60 DAT, respectively. The per day accumulation of dry matter during 60-90 DAT period was almost three to four times of that accumulated during 30-60 DAT. Thereafter growth rate almost declined till maturity during both the years.The increased concentration of N at different growth stages and its uptake by plant helped in increasing the yield components and grain yield. The critical analysis of grain yield observations revealed that conjunction of lower levels of inorganic fertilizer (100:60:40 or 50:30:20 kg NPK ha-1) along with CDU or PM gave the saving of 50 kg N, 20 kg P and 20 kg K ha-1 for the cultivation of hybrid rice. Moreover, the higher buildup of available N and K has been also observed under said combination of organic and inorganic fertilizer treatments. The application of 150:80:60 kg NPK ha-1 along with PSB gave the highest buildup of available phosphorus. Inorganic level of 150:80:60 kg NPK ha-1 gave the highest production efficiency and productivity rating index, which was followed by application of inorganic fertilizer of 100:60:40 kg NPK ha-1 along with PM and blending of N with CDU, respectively. The application inorganic fertilizer of 50:30:20 kg NPK ha-1 + PM gave the highest nutrient efficiency during both the years. The highest input cost, net profit and per rupee investment was found under 150:80:60 kg NPK ha-1 followed by application of 100:60:40 kg NPK ha-1 along with PM.

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