AI Article Synopsis
- Cucumber seedlings exhibit gravitropism and peg formation due to auxin distribution.
- Researchers isolated five auxin efflux carrier partial cDNAs and two full-length cDNAs (CsPIN2, CsPIN3) to study auxin regulation.
- Phylogenetic analysis suggests that cucumber (CsPIN) proteins have diversified in comparison to Arabidopsis (AtPIN) proteins.
Article Abstract
Cucumber seedlings display not only gravitropism but also peg formation in response to gravity. Gravimorphogenesis is mediated by auxin distribution. As first step to reveal the mechanism that regulates auxin distribution by auxin efflux, we isolated five partial cDNAs of auxin efflux carriers by RT-PCR method. In addition, we isolated two full-length cDNAs (CsPIN2, CsPIN3) from a cucumber cDNA library. CsPIN2, AtPIN3, AtPIN4 and AtPIN7 fall within the same clade. CsPIN3, AtPIN1 and CsPIN1 fall within the same clade. CsPIN5, CsPIN6 and AtPIN2 fall within the same clade. Our phylogenetic analysis of PIN in cucumber and Arabidopsis indicates that cucumber may diversify CsPIN protein compared with AtPIN protein.
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