Agronomic and yield selection of doubled haploid lines of rainfed lowland rice in advanced yield trials

Abstract

Abstract. Akbar MR, Purwoko BS, Dewi IS, Suwarno WB, Sugiyanta, Anshori MF. 2021. Agronomic and yield selection of doubled haploid lines of rainfed lowland rice in advanced yield trials. Biodiversitas 22: 3006-3012. Selection process is important step to obtain high yielding variety. This study aimed to obtain information on agronomic performance of doubled haploid lines of rainfed rice in advanced yield trials and select the best lines for multi-location yield trials. Two experiments were conducted in Bogor and Subang using a randomized complete block design for each location and consisted of 35 doubled haploid lines and two check varieties namely Ciherang and Inpari 18 as a treatment. The result revealed that interaction between genotype and environment (G x E) significantly affected all agronomic characters, except on the panicle length. Characters with high heritability value were all agronomic characters except number of productive tillers and productivity. Genotypic correlation analysis showed that number of productive tillers and weight of 1000 grains had significant and positive correlation with productivity. The selection used weighted selection index based on multivariate analysis. Fourteen lines were selected for multi-location yield trials. These lines had characteristics as follows: number of productive tillers (14.0-17.7 tillers), weight of 1000 grains (24.7-32.5 g), and productivity (5.0-6.2 ton ha-1). The selected lines can be evaluated further to obtain superior lines in multi-location trials.

Selection of upland rice lines in advanced yield trials and response to abiotic stress

“…In the present study, productivity has the lowest heritability value. This result was in line with the productivity's GCV value, which was relatively low (Table 5), indicating that direct selection based on productivity is ineffective (Akbar et al 2021). Simultaneous selection with several characters correlated with productivity can be used as an alternative for improving grain yields.…”

“…Estimation of broadsense heritability (h 2 bs) was calculated by the equation proposed by Falconer and Mackay (1996). The h 2 bs value was categorized into three categories, i.e., low (h 2 bs<0.2), moderate (0.2≤h 2 bs≤0.5), and high (h 2 bs>0.5) (Akbar et al 2021).…”

“…Therefore, selection would be effective if using characters with high GCV. According to Akbar et al (2021), the GCV value should be combined with the heritability value to be a good criterion for determining the selection character.…”

“…The high heritability indicates that the observed characters are more influenced by genetic factors than environmental factors in their expression (Saha et al 2019). The high heritability could increase the effectiveness of selection (Akbar et al 2021). On the other hand, the low heritability may be caused by the considerable influence of environmental factors on a character's expression (Abebe et al 2017).…”

“…The selection index is an indirect selection method that uses several characters correlated with the main character and combines all information into an index as the basis in the selection process (Falconer and Mackay 1996). Determination of the secondary selection character and the weighting of each character in constructing the selection index model can be done by multivariate analysis, such as path analysis (Oladosu et al 2018;Saha et al 2019;Sudeepthi et al 2020) and principal component analysis (Alsabah et al 2019;Akbar et al 2021;Anshori et al 2021).…”