Abstract
Internode length and stem diameter are the primary traits affecting the lodging resistance of rice. Traits related to the length of the panicle (LP), uppermost internode (LUI), second internode (LSI), third internode (LTI), fourth internode (LFI), lowest internode (LLI) as well as stem diameter at the uppermost internode (SDUI), second internode (SDSI), third internode (SDTI), fourth internode (SDFI), and lowest internode (SDLI) in 120 Cheongcheong/Nagdong doubled haploid population were investigated using a quantitative trait locus (QTL) analysis. Thirty-four QTL regions affected LP and the length of each internode. Twenty-six QTL regions were associated with the stem diameter of each internode. RM12285-RM212 on chromosome 1 contained 10 QTLs related to the internode length, which have overlapped for over 2 years. Twenty-three candidate genes were screened using mark interval. Among the candidate genes, Os01g0803900, named OsCYPq1, which is in the Cytochrome P450 family, might be involved in gibberellins (GA) synthesis. GA is an essential plant growth regulator that affects plant height. OsCYPq1 catalyzes oxidation steps in the middle part of the GA pathway. OsCYPq1 is expected to provide valuable information to improve the marker assessment for target traits and QTL gene cloning in rice.
Highlights
In 2019 and 2020 analysis of correlation, each internode length has a high correlation with the stem diameter of each internode; for LUI, LFI, and LLI, there was no significant correlation with stem diameter at the uppermost internode (SDUI) (Table S1)
Magome et al reported two cytochrome P450 family genes, CYP714B1 and CYP714B2, encoded as GA 13-oxidase that reduced GA activity in rice plants. Their results revealed that CYP714B1 and CYP714B2 proteins can convert the GA12 to GA53. These results fully demonstrate the importance of the cytochrome P450 in GA biosynthesis
Current findings suggest that the cytochrome P450 family gene (OsCYPq1) has functional involvement in the stem diameter or internode elongation
Summary
Rice is a globally important food and a nutrition-rich crop. It feeds >50% of the world’s population. As the most important crop, its demand increases daily, increasing its attention in the scientific community to develop healthier and more productive rice cultivar to meet the feeding demand of the world. With the recent deterioration of the environment and the increasing number of typhoons, rice lodging has become serious [1]. Among these environmental conditions, lodging is considered one of the most affected environmental conditions that makes harvesting difficult and causes great loss of grain yield and quality [2].
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