Rice is the most important staple food consumed by more than half of the world's population. Aromatic, glutinous, pigmented and japonica rice are some of the specialty types that command higher prices in the market. One of the essential keys is the utilization of breeding goals and objectives of conventional and organic rice systems.
In terms of environmental conditions, there are many challenges to be faced with the improvement of varieties. However, none of the lines had higher antioxidant properties and anthocyanin content than the original parent variety. Continuous selection of Mestizo mutant lines in WS for selection of best resistance showed comparable yield performance.
IG Pacada, EH Bandonill, AM Tuates, TF Padolina, AP Tuaño, BO Juliano One of the important considerations in the development of new rice varieties is grain quality. The Rice Variety Improvement Group (RVIG) wheat quality evaluation team manually evaluates the physical attributes of 600-800 promising elite lines each year.
Development of Irrigated Lowland Rice Varieties
Hybridization and Pedigree Nursery for Transplanted and Direct-seeded Irrigated lowland rice varieties
Hybridization and Pedigree Nursery of Transplanted Irrigated lowland rice varieties
Of these crosses, only 22 were advanced in hybrid population non-selection (HPNS) in a mass nursery during the dry season (DS). During the wet season (WS), 39 crosses were promoted in HPNS and 8 other crosses in another ecosystem (HT & CT). In the F2-F3 generations, the HPNS consisted of 80 crosses (c) between DS, of which 30 were selected by pan selection (HPS) in a modified mass nursery&.
While from the 32 crosses of the HPNS wet season, all were advanced to HPS and the 30 crosses of the latter were advanced to pedigree nursery (Table 7). A total of 1722 new derived lines (dl) were advanced to the pedigree nursery during the DS and 2212 derived lines in the WS. After thorough plant selection and seed evaluation, 654dl and 442dl were retained in the pedigree nursery during the dry and wet seasons, respectively.
Hybridization and Pedigree Nursery of Direct-seeded Irrigated lowland rice varieties
- National Cooperative Testing (NCT) for Rice
This study consists of field performance trials, which are "Advanced Observation Nursery", Preliminary Yield Trial, Multi-Environmental Trial (MET) phase 0, MET 1 and MET 2. Performance evaluation of uniform lines from selections of origin determines yield, reactions to biotics. and abiotic stresses and general acceptability of breeding lines. Statistical analysis showed that the yields of all test entries were comparable to the controls.
The highest yielding line was 104cm high while the heights of the sister lines ranged from 83 to 95cm. The yield potential of the selected F6 lines will be evaluated in 2015, while the selected F4 and F5 lines will be further advanced until the presence of the introgressed genes and agronomic phenotypes become stable. Rice varieties with higher yield potential are needed to meet the increasing demands of the population.
Bare seeds will be planted together with both parents for phenotypic comparison and selection of desired traits. Since farmers are the end users of all yield test results, the final yield tests should be conducted in their own fields.
Rice Technical Working Group (RTWG) approved recommendations in 2014
Since the previous selection is carried out in this environment, the final assessment must be carried out under the same conditions. The national cooperative test for all ecosystems is carried out in selected locations and in the field of researchers. IRRI inbred • With an average yield of 5.1 t/ha in NCT I and MAT trials with a yield advantage of 0 8.7% in DS and an average of 14.1% in WS in PSU, DA-CVLMROS, MINSCAT and BIARC compared to PSB Rc82.
Intermediate response to blast (B), bacterial leaf blight (BLB), sheath blight (ShB), white (WSB) and yellow stem borer (YSB) in the majority of test sites. Intermediate to resistant response to BLB, B, ShB, YSB and brown planthopper (BPH) in target sites. Intermediate to resistant to B, ShB, BLB, RTV under modified field screening, YSB, WSB, BPH and GLH.
Rice Varietal Improvement Group
- Basic Seed Production of Philippine Rice Varieties and Promising Lines
- Development of Hybrid Rice Varieties
- Development Of Thermo-Sensitive Genetic Male Sterile (TGMS) Lines and TGMS-Based Two-Line Hybrid Rice
- Breeding of Specialty Rice
- Development of Rice Varieties Adapted to Rainfed and Stress Environments
Maintainer and repair lines are also very essential components in the development of hybrid rice. Established in the source nursery (SN) were 211 (DS) and 130 (WS) male parental lines composed of doubled haploid (DH), 142 tropical japonica (TJ) and optimized plant morphology (OPM) and multi-environment trial (MET) entries. In the DS (Table 33), six three-line hybrids from crosses involving four CMS lines and six restorers, and nine two-line hybrids from crosses involving five TGMS lines and eight pollen parents, were tested against four control varieties; two hybrids (Mestiso 19 and Mestiso 29), and two inbreds (NSIC Rc240 and PSB Rc18).
In DS, 36 recovery lines were evaluated against four control varieties (Table 34); two hybrids (Mestiso 19 and Mestiso 29) and two inbreds (PSB Rc18 and PSB Rc82). In WS, 23 triline crosses (Table 35) developed from crosses of 6 CMS lines and 23 restorer lines were evaluated with five control varieties; two hybrids (Mestiso 32 and Mestiso 48) and three inbreds (NSIC Rc240, PSB Rc18 and PSB Rc82). F1 seeds of 12 (three two-line and nine three-line) experimental hybrids were grown in WS.
Included in the pooled panel for screening were four of the lineages of released hybrids (Mestiso 1, Mestiso 47 and Mestiso 48). The recovery lines were also clustered in the lower part of the tree with two groups. F1 seeds from the promising hybrids were produced in the wet season for further testing in the hybrid preliminary yield trial (HPYT) in the dry season 2015.
Meanwhile, 252 new experimental hybrids were evaluated in the Hybrid Observational Nursery (HON) during the wet season using the same controls (Table 1a-1c). In the hybrid preliminary yield trial (HPYT), 40 experimental hybrids were evaluated during the dry season (Table 56a and Table 56b). Grain yield (kg/ha) of good performing hybrids in the preliminary yield trial, 2014 dry season.
Grain yield (kg/ha) of high-performing hybrids in the 2014 wet season early yield trial. The National Cooperative Trial for Special Purpose (NCT-SP) assessed five aromatic (A) and seven sticky (G) entries, both during the dry (DS) and wet season (WS). During the DS, of the 419 entries evaluated in the Advanced Observation Nursery (AON), 200 were retained for further evaluation and 58 were advanced to Preliminary Yield Trial (PYT).
Dividend performance for the promising items in AON increased to PYT, PhilRice CES, 2014DS. Dividend performance for the promising items in AON raised to PYT, PhilRice CES, 2014 WS. Number of lions selected in the field based on phenotype (percent sterility) and genotype (molecular data).
Selected entries will be evaluated in the following season, 2015 WS, under upland conditions (managed drought stress condition).
