Genotypic-phenotypic relationship between grain yield, leaf biochemicals and anthesis quality traits in rice under reproductive stage drought

Salleh, Mohd Syahmi and Nordin, Mohd Shukor and Yusop, Mohd Rafii and Abd. Aziz Shamsudin, Noraziyah and Ab Ghaffar, Mohamad Bahagia (2022) Genotypic-phenotypic relationship between grain yield, leaf biochemicals and anthesis quality traits in rice under reproductive stage drought. In: 5th International Plant Breeding Conference (IPBC) 2022, 8-9 March 2022, Online. (Unpublished)

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Abstract

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.

Item Type:	Conference or Workshop Item (Slide Presentation)
Uncontrolled Keywords:	Anthesis quality, Drought, Grain yield, Path-coefficient, Rice
Subjects:	Q Science > QH Natural history > QH426 Genetics S Agriculture > S Agriculture (General)
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Science > Department of Plant Science
Depositing User:	Dr Mohd Syahmi Salleh
Date Deposited:	25 Mar 2022 14:57
Last Modified:	25 Mar 2022 14:57
URI:	http://irep.iium.edu.my/id/eprint/97243

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