Dataset Information

Development and evaluation of pyramiding lines carrying early or late heading QTLs in the indica rice cultivar 'IR64'.

ABSTRACT: The heading date is an important trait for determining regional and climatic adaptability in rice. To expand the adaptability of the indica rice cultivar 'IR64', we pyramided multiple early or late heading quantitative trait locus (QTLs) in the 'IR64' genetic background by crossing previously developed near-isogenic lines (NILs) with a single QTL for early or late heading. The effects of pyramiding QTLs were observed in three different climatic zones of the Philippines, Madagascar, and Japan. The early heading pyramiding lines (PYLs) headed 6.2 to 12.8 days earlier than 'IR64' while the late heading PYLs headed 18.8 to 27.1 days later than 'IR64'. The PYLs tended to produce low grain yield compared to 'IR64'. The low yield was not improved by combining SPIKE, which is a QTL that increases the number of spikelets per panicle. Conversely, 'IR64-PYL(7+10)' carrying Hd5 and Hd1 headed earlier, produced more tillers, and more panicles per m² than 'IR64', and mitigated the yield decrease in early heading. These results suggest that the effects of pyramided QTLs on heading date were consistent across various environments and PYLs could be used to enhance the adaptation of 'IR64' in other rice growing environments.

SUBMITTER: Takai T

PROVIDER: S-EPMC8784346 | biostudies-literature | 2021 Dec

REPOSITORIES: biostudies-literature

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Development and evaluation of pyramiding lines carrying early or late heading QTLs in the <i>indica</i> rice cultivar 'IR64'.

Takai Toshiyuki T Lumanglas Patrick P Fujita Daisuke D Sasaki Kazuhiro K Rakotoarisoa Njato Michael NM Tsujimoto Yasuhiro Y Kobayashi Nobuya N Simon Eliza Vie EV

Breeding science 20211117 5

The heading date is an important trait for determining regional and climatic adaptability in rice. To expand the adaptability of the <i>indica</i> rice cultivar 'IR64', we pyramided multiple early or late heading quantitative trait locus (QTLs) in the 'IR64' genetic background by crossing previously developed near-isogenic lines (NILs) with a single QTL for early or late heading. The effects of pyramiding QTLs were observed in three different climatic zones of the Philippines, Madagascar, and Ja ...[more]

PMID: 35087326

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Project description:BackgroundCellular reprogramming in response to environmental stress involves alteration of gene expression, changes in the protein and metabolite profile for ensuring better stress management in plants. Similar to other plant species originating in tropical and sub-tropical areas, indica rice is highly sensitive to low temperature that adversely affects its growth and grain productivity. Substantial work has been done to understand cold induced changes in gene expression in rice plants. However, adequate information is not available for early gene expression, especially in indica variety. Therefore, a transcriptome profile was generated for cold shock treated seedlings of IR64 variety to identify early responsive genes.ResultsThe functional annotation of early DEGs shows enrichment of genes involved in altered membrane rigidity and electrolytic leakage, the onset of calcium signaling, ROS generation and activation of stress responsive transcription factors in IR64. Gene regulatory network suggests that cold shock induced Ca2+ signaling activates DREB/CBF pathway and other groups of transcription factors such as MYB, NAC and ZFP; for activating various cold-responsive genes. The analysis also indicates that cold induced signaling proteins like RLKs, RLCKs, CDPKs and MAPKK and ROS signaling proteins. Further, several late-embryogenesis-abundant (LEA), dehydrins and low temperature-induced-genes were upregulated under early cold shock condition, indicating the onset of water-deficit conditions. Expression profiling in different high yielding cultivars shows high expression of cold-responsive genes in Heera and CB1 indica varieties. These varieties show low levels of cold induced ROS production, electrolytic leakage and high germination rate post-cold stress, compared to IR36 and IR64. Collectively, these results suggest that these varieties may have improved adaptability to cold stress.ConclusionsThe results of this study provide insights about early responsive events in Oryza sativa l.ssp. indica cv IR64 in response to cold stress. Our data shows the onset of cold response is associated with upregulation of stress responsive TFs, hydrophilic proteins and signaling molecules, whereas, the genes coding for cellular biosynthetic enzymes, cell cycle control and growth-related TFs are downregulated. This study reports that the generation of ROS is integral to the early response to trigger the ROS mediated signaling events during later stages.

Dataset Information

Development and evaluation of pyramiding lines carrying early or late heading QTLs in the indica rice cultivar 'IR64'.

Publications

Development and evaluation of pyramiding lines carrying early or late heading QTLs in the <i>indica</i> rice cultivar 'IR64'.

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