Genotypic-phenotypic relationship between grain yield, leaf biochemicals and anthesis quality traits in rice under reproductive stage drought
Reproductive stage drought significantly reduces harvestable grain yield of rice. The leaf relative water content (LRWC) is commonly used as secondary selection criterion in breeding drought tolerant rice. Aim of this study was to compare the degree of association between leaf biochemicals and anthe...
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| Main Authors: | , , , , |
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| Format: | Conference or Workshop Item |
| Language: | English English English |
| Published: |
2022
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/97243/12/IPBC2022_007-010.pdf http://irep.iium.edu.my/97243/14/Presenter_Dr.%20Mohd%20Syahmi.pdf http://irep.iium.edu.my/97243/15/IPBC2022%20Programme%20%26%20Abstract%20Book%20Rev2.pdf http://irep.iium.edu.my/97243/ |
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| Summary: | Reproductive stage drought significantly reduces harvestable grain yield of rice. The leaf relative water content (LRWC) is commonly used as secondary selection criterion in breeding drought tolerant rice. Aim of this study was to compare the degree of association between leaf biochemicals and anthesis quality traits (AQT) with the harvestable grain yield (GY) under reproductive stage drought (RSD). The pot-trial experiment was conducted using randomized complete block design (RCBD) with three replications. There were 18 rice genotypes consisted of selected cultivars, breeding lines and landraces involved in this study. Quantitative assessment
of leaf biochemicals and AQT were conducted under RSD at -60 kPa. The GY was recorded at harvest maturity. Genotypic correlation analysis was conducted to determine general association of the studied traits while the path coefficient analysis was to determine the direct and indirect effects of LRWC and AQT (independent variables) on the GY (dependent variable). The level of lipid peroxidation and proline content were not significantly correlated with AQT, LRWC, and GY. In contrast, spikelet moisture content (SMC) was positively and significantly correlated with all of the AQT particularly spikelet opening (SO), anther exsertion (AE), apical dehiscence length (ADL), apical dehiscence width (ADW), basal dehiscence length (BDL), basal dehiscence
width (BDW), number of pollen grains (NPG) and pollen load on stigma (PLS) at 0.624, 0.746, 0.786, 0.799, 0.735, 0.789, 0.724, and 0.701 except for the rate of pollen viability (RPV) at
0.506. The SMC was also positively and significantly correlated with the LRWC (0.949) and GY (0.836). Results of the path-coefficient analysis revealed that the direct and indirect effects of the SMC towards GY were higher than the LRWC and other AQT. This indicated that the SMC was
highly associated and contributed to higher GY under RSD. The LRWC in contrast recorded negative direct effect with GY (-0.912) under RSD. These results suggested that SMC might be used as a better secondary selection criterion in breeding drought tolerant rice compared to LRWC. However, further field trials are necessary to confirm finding of the present study. |
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