title: SlARF2a plays a negative role in mediating axillary shoot formation.
abstract: SlARF2a is expressed in most plant organs, including roots, leaves, flowers and fruits. A detailed expression study revealed that SlARF2a is mainly expressed in the leaf nodes and cross-sections of the nodes indicated that SlARF2a expression is restricted to vascular organs. Decapitation or the application of 6-benzylaminopurine (BAP) can initially promote axillary shoots, during which SlARF2a expression is significantly reduced. Down-regulation of SlARF2a expression results in an increased frequency of dicotyledons and significantly increased lateral organ development. Stem anatomy studies have revealed significantly altered cambia and phloem in tomato plants expressing down-regulated levels of ARF2a, which is associated with obvious alterations in auxin distribution. Further analysis has revealed that altered auxin transport may occur via altered pin expression. To identify the interactions of AUX/IAA and TPL with ARF2a, four axillary shoot development repressors that are down-regulated during axillary shoot development, IAA3, IAA9, SlTPL1 and SlTPL6, were tested for their direct interactions with ARF2a. Although none of these repressors are directly involved in ARF2a activity, similar expression patterns of IAA3, IAA9 and ARF2a implied they might work tightly in axillary shoot formation and other developmental processes.
authors.affiliation: College of Horticulture, Shenyang Agricultural University, Shenyang 110866, Liaoning, People's Republic of China.|Key Laboratory of Protected Horticulture of Ministry of Education, No. 120 Dongling Road, Shenhe District 110866, People's Republic of China.
authors.forename: Tao
authors.initials: T
authors.lastname: Xu
authors.affiliation: College of Horticulture, Shenyang Agricultural University, Shenyang 110866, Liaoning, People's Republic of China.|Key Laboratory of Protected Horticulture of Ministry of Education, No. 120 Dongling Road, Shenhe District 110866, People's Republic of China.
authors.forename: Xin
authors.initials: X
authors.lastname: Liu
authors.affiliation: College of Horticulture, Shenyang Agricultural University, Shenyang 110866, Liaoning, People's Republic of China.|Key Laboratory of Protected Horticulture of Ministry of Education, No. 120 Dongling Road, Shenhe District 110866, People's Republic of China.
authors.forename: Rong
authors.initials: R
authors.lastname: Wang
authors.affiliation: College of Horticulture, Shenyang Agricultural University, Shenyang 110866, Liaoning, People's Republic of China.|Key Laboratory of Protected Horticulture of Ministry of Education, No. 120 Dongling Road, Shenhe District 110866, People's Republic of China.
authors.forename: Xiufen
authors.initials: X
authors.lastname: Dong
authors.affiliation: Zunyi Normal University, No. 830 Shanghai Road, Zunyi City, Guizhou Province, People's Republic of China.
authors.forename: Xiaoxi
authors.initials: X
authors.lastname: Guan
authors.affiliation: College of Horticulture, Shenyang Agricultural University, Shenyang 110866, Liaoning, People's Republic of China.|Key Laboratory of Protected Horticulture of Ministry of Education, No. 120 Dongling Road, Shenhe District 110866, People's Republic of China.
authors.forename: Yanling
authors.initials: Y
authors.lastname: Wang
authors.affiliation: College of Horticulture, Shenyang Agricultural University, Shenyang 110866, Liaoning, People's Republic of China.|Key Laboratory of Protected Horticulture of Ministry of Education, No. 120 Dongling Road, Shenhe District 110866, People's Republic of China.
authors.forename: Yun
authors.initials: Y
authors.lastname: Jiang
authors.affiliation: College of Horticulture, Shenyang Agricultural University, Shenyang 110866, Liaoning, People's Republic of China.|Key Laboratory of Protected Horticulture of Ministry of Education, No. 120 Dongling Road, Shenhe District 110866, People's Republic of China.
authors.forename: Zihang
authors.initials: Z
authors.lastname: Shi
authors.affiliation: College of Horticulture, Shenyang Agricultural University, Shenyang 110866, Liaoning, People's Republic of China.|Key Laboratory of Protected Horticulture of Ministry of Education, No. 120 Dongling Road, Shenhe District 110866, People's Republic of China.
authors.forename: Mingfang
authors.initials: M
authors.lastname: Qi
authors.affiliation: College of Horticulture, Shenyang Agricultural University, Shenyang 110866, Liaoning, People's Republic of China.|Key Laboratory of Protected Horticulture of Ministry of Education, No. 120 Dongling Road, Shenhe District 110866, People's Republic of China.
authors.forename: Tianlai
authors.initials: T
authors.lastname: Li
mesh_terms: D001593:Benzyl Compounds / Q000494:pharmacology*; D058506:Cambium / Q000235:genetics / Q000378:metabolism*; D018506:Gene Expression Regulation, Plant / Q000187:drug effects*; D007210:Indoleacetic Acids / Q000378:metabolism; D018551:Solanum lycopersicum / Q000235:genetics / Q000378:metabolism*; D052585:Phloem / Q000235:genetics / Q000378:metabolism*; D010940:Plant Proteins / Q000096:biosynthesis* / Q000235:genetics; D011687:Purines / Q000494:pharmacology*
chemical_list: D001593:Benzyl Compounds; D007210:Indoleacetic Acids; D010940:Plant Proteins; D011687:Purines; C480551:benzylaminopurine