scholarly journals Comparative studies on different methods for perfect synchronization of parental lines of Sahyadri 3 rice hybrid for commercial hybrid rice seed production

2020 ◽  
Vol 11 (04) ◽  
Keyword(s):  
Seed Production ◽  
Comparative Studies ◽  
Hybrid Rice ◽  
Rice Seed ◽  
Rice Hybrid ◽  
Parental Lines

scholarly journals Floral traits and flowering behaviors of Malaysian rice cytoplasmic male sterile and maintainer lines and its relationship with out-crossing performance

2021 ◽  
pp. 180-186
Author(s):  
Shahida Hashim ◽  
Phebe Ding ◽  
Mohd Firdaus Ismail ◽  
Asfaliza Ramli
Keyword(s):  
Seed Production ◽  
Hybrid Rice ◽  
Agricultural Research ◽  
Floral Traits ◽  
Rice Seed ◽  
Male Sterile ◽  
Floral Trait ◽  
Cytoplasmic Male Sterile ◽  
Cross Pollination ◽  
Parental Lines

Rice is a strictly self-pollinating crop. However, in hybrid rice seed production, an effective male sterility system is used to produce hybrid seed in bulk. In hybrid rice system, the pollen grains of cytoplasmic male sterile (CMS) are sterile and the female organ of the CMS depends on the fertile pollen released by the maintainer or restorer lines via out-crossing or cross-pollination in order to produce seed. Floral trait and flowering behavior of CMS and its corresponding maintainer or restorer lines are essential factors in hybrid rice seed production because they influenced the out-crossing or cross-pollination between parental lines. Two local CMSs and their corresponding maintainer lines were developed through breeding program in Malaysian Agricultural Research and Development Institute (MARDI) namely 0025A/0025B and 0047A/0047B. This study was carried out on floral traits and flowering behavior of these two hybrid line. Present studies have shown that there were variations between the CMS and its maintainer lines whether on floral trait or flowering behavior for both hybrid rice combinations. The results showed that stigma characters for both 0025A and 0047 were superior than their respective maintainers. Therefore, it is expected that the out-crossing rate would be high. Seeding date intervals need to be done on 0025A/0025B during nursery stage because the on-set of flowering between parental lines was significantly different. Panicle of both CMS was also classified as just exserted and partially-exserted and application of exogenous hormones such as gibberellic acid was useful to improve panicle elongation and consequently increase the seed set and yield. Correlation study indicates that the stigma area of both 0025A and 0047A has significant positive correlation with out-crossing rate.

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 Effect Of Ga3 And Row Ratio On Floral Traits Of Component Lines Of BRRI Hybrid Dhan2

2013 ◽  
Vol 38 (1) ◽  
pp. 155-163 ◽  
Author(s):  
MH Rahman ◽  
MM Khatun ◽  
MSR Khan ◽  
MM Haque ◽  
MG Rasul
Keyword(s):  
Seed Production ◽  
Hybrid Rice ◽  
Environmental Influence ◽  
Floral Traits ◽  
Rice Seed ◽  
Filament Length ◽  
Anther Length ◽  
Cms Line ◽  
Stigma Exsertion ◽  
Stigma Exsertion Rate

Component lines (A and R lines) of BRRI hybrid dhan2 were assessed under treatment of GA3 application and row ratio on days to 5% and 50% flowering, duration of opening of floret, angle of open floret, filament length, anther length, stigma length, panicle exsertion rate, stigma exsertion rate and outcrossing rate. The CMS line viz; BRRI 10A have been found to be usable female parents for hybrid rice seed production due to their stigma length, stigma exsertion rate, duration of blooming, anther length and filament length. The different between genotypic and phenotypic variation was not remarkable for most of the characters studied indicating negligible environmental influence on the traits. The maximum duration of opening of floret (158.10 min) and angle of floret opening (28.870) were obtained with the application of 350 g GA3 ha-1. The improvement in the floral traits with increased GA3 level might be due to increased availability of GA3 which enhanced floral traits. The CMS line can be used as potential female parent in hybrid rice seed production of BRRI hybrid dhan2. Bangladesh J. Agril. Res. 38(1): 155-163, March 2013 DOI: http://dx.doi.org/10.3329/bjar.v38i1.15202

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