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Transgenic citrange lines with rol ABC genes behave rosette branching and extreme dwarfing.To explore the regulatory mechanism of plant hormones in axillary shoot growth of transgenic citrange,a full length cD NA of CPMAX2 was cloned from citrange [Citrus sinensis(L.) Osb × Poncirus trifoliate(L.) Raf.] by RT-PCR in this study.The expression of CPMAX2 was detected in axillary tender leaves of 3 transgenic citrange lines and the wild type.Additionally,we constructed an over-expression vector CPMAX2-p CAMBIA1301 for further study.The results showed that the c DNA sequence and its putative peptide sequence shared 99.66% and 99.14% of identity with its Citrus sinensis ortholog MAX2.The deduced amino acid sequence contained putatively one F-box and two LRR repeat domains that are highly conserved in MAX2 genes.CPMAX2 was obviously down-expressed in tender leaves of 3 transgenic citrange lines compared with the wild type.The results suggest CPMAX2 play an important role in regulating the rosette shoot growth in transgenic citrange with rol ABC genes.
Transgenic citrange lines with rol ABC genes behave rosette branching and extreme dwarfing. To explore the regulatory mechanism of plant hormones in axillary shoot growth of transgenic citrange, a full length cD NA of CPMAX2 was cloned from citrange [Citrus sinensis (L.) Osb × Poncirus trifoliate (L.) Raf.] By RT-PCR in this study. The expression of CPMAX2 was detected in axillary tender leaves of 3 transgenic citrange lines and the wild type. Additionally, we constructed an over- expression vector CPMAX2-p CAMBIA1301 for further study. The results showed that the DNA sequence and its putative peptide sequence shared 99.66% and 99.14% identity with its Citrus sinensis ortholog MAX2. The deduced amino acid sequence contained putatively one one F-box and two LRR repeat domains that are highly conserved in MAX2 genes.CPMAX2 was obviously down-expressed in tender leaves of 3 transgenic citrange lines compared with the wild type.The results suggest CPMAX2 play an important role in regulating the ro sette shoot growth in transgenic citrange with rol ABC genes.