Abstract
BackgroundRice plants suffer from the rising temperature which is becoming more and more prominent. Mining heat-resistant genes and applying them to rice breeding is a feasible and effective way to solve the problem.ResultThree main biomass traits, including shoot length, dry weight, and fresh weight, changed after abnormally high-temperature treatment in the rice seedling stage of a recombinant inbred lines and the natural indica germplasm population. Based on a comparison of the results of linkage analysis and genome-wide association analysis, two loci with lengths of 57 kb and 69 kb in qDW7 and qFW6, respectively, were associated with the rice response to abnormally high temperatures at the seedling stage. Meanwhile, based on integrated transcriptome analysis, some genes are considered as important candidate genes. Combining with known genes and analysis of homologous genes, it was found that there are eight genes in candidate intervals that need to be focused on in subsequent research.ConclusionsThe results indicated several relevant loci, which would help researchers to further discover beneficial heat-resistant genes that can be applied to rice heat-resistant breeding.
Highlights
Rice plants suffer from the rising temperature which is becoming more and more prominent
The average and extreme values of the shoot length (SL), dry weight (DW), and fresh weight (FW) of Recombinant inbred lines (RILs) and natural population decreased after heat stress treatment, which confirmed that heat stress had a negative impact on rice growth
The measured values between the RIL control and the treatment groups were different, and the measured values were higher than the average value of the corresponding parents, which suggested the existence of super-parent separation of biomass traits (Table S1)
Summary
Rice plants suffer from the rising temperature which is becoming more and more prominent. Rice (Oryza sativa L.) is the main food crop worldwide, especially in Asian countries. As an Asian country, China has a population of 1.4 billion, and 2/3 of the people’s main food is rice. The rising high temperature is affecting the rice yield worldwide. Even if some rice varieties from tropical regions have formed ecological characteristics adapted to hightemperature environments, their yields will be affected once the temperature exceeds their appropriate temperature [2]. The ambient temperature exceeding the appropriate temperature during rice growth and development would lead to yield reduction [3]. When rice seedlings experience high temperatures above 35 °C, the protein type and content of leaves change considerably [6, 7], and the shoot length, dry weight, and other traits are negatively affected [8]
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