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Purine permease (PUP) family gene PUP11 positively regulates the rice seed setting rate by influencing seed development
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Purine permease (PUP) family gene PUP11 positively regulates the rice seed setting rate by influencing seed development
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Purine permease (PUP) family gene PUP11 positively regulates the rice seed setting rate by influencing seed development
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Journal Article
Purine permease (PUP) family gene PUP11 positively regulates the rice seed setting rate by influencing seed development
2024
Overview
Key message
Purine permease PUP11 is essential for rice seed development, regulates the seed setting rate, and influences the cytokinin content, sugar transport, and starch biosynthesis during grain development.
The distribution of cytokinins in plant tissues determines plant growth and development and is regulated by several cytokinin transporters, including purine permease (PUP). Thirteen
PUP
genes have been identified within the rice genome; however, the functions of most of these genes remain poorly understood. We found that
pup11
mutants showed extremely low seed setting rates and a unique filled seed distribution. Moreover, seed formation arrest in these mutants was associated with the disappearance of accumulated starch 10 days after flowering.
PUP11
has two major transcripts with different expression patterns and subcellular locations, and further studies revealed that they have redundant positive roles in regulating the seed setting rate. We also found that type-A
Response Regulator (RR)
genes were upregulated in the developing grains of the
pup11
mutant compared with those in the wild type. The results also showed that PUP11 altered the expression of several sucrose transporters and significantly upregulated certain starch biosynthesis genes. In summary, our results indicate that PUP11 influences the rice seed setting rate by regulating sucrose transport and starch accumulation during grain filling. This research provides new insights into the relationship between cytokinins and seed development, which may help improve cereal yield.
