[The structural characteristics, alternative splicing and genetic experession analysis of ADP-ribosylation-factor 1 (arf1) in cotton].

The full-length cDNA,DNA and promoter of ADP-ribosylation-factor 1 (arf1) was isolated from Gossypium hirsutum Y18 by means of isocaudarner inverse PCR (II-PCR) and rapid isolating cDNA 5′unknown sequence and promoter (RICUP) established in our lab. Results indicated that the gene is 4 360 bp in size,including seven exons and six introns. Interestingly,alterative splicing occurs at intron I. Differential processing of intron 1 yields three different transcripts with 1 026 bp,1103bp and 1 544 bp in sizes,respectively. Arf1 encodes 181 amino acids. Sequence analysis indicated that sequence upstream transcription initiation site of arf1 includes typical initiator,TATA box,CCAAT box,GC box and several forward and reverse repeat sequences. And typical promoter structures,such as AT-rich sequence and palindrome structure have been detected in the sequence downstream transcription initiation site. Southern blot analysis indicated that the gene has two copies in the genome of cotton. Northern blot confirmed the predominate expression of arf1 in reproductive organs of cotton,including bud,flower,fiber and boll. Also,the feature and character of arf1 and its promoter have been studied. This study will lay foundation for the other research on function of arf1 in the development of reproductive organs in cotton.