PIN6 is required for nectary auxin response and short stamen development

被引:74
作者
Bender, Ricci L. [1 ]
Fekete, Megan L. [1 ]
Klinkenberg, Peter M. [1 ]
Hampton, Marshall [2 ]
Bauer, Brittany [1 ]
Malecha, Matthew [1 ]
Lindgren, Khrystyne [3 ]
A. Maki, Jennifer [3 ]
Perera, M. Ann D. N. [4 ,5 ]
Nikolau, Basil J. [4 ,5 ]
Carter, Clay J. [1 ]
机构
[1] Univ Minnesota, Dept Biol, Duluth, MN 55812 USA
[2] Univ Minnesota, Dept Math & Stat, Duluth, MN 55812 USA
[3] Coll St Scholastica, Dept Chem, Duluth, MN 55811 USA
[4] Iowa State Univ, Dept Biochem Biophys & Mol Biol, Ames, IA 50011 USA
[5] Iowa State Univ, WM Keck Metabol Res Lab, Ames, IA 50011 USA
基金
美国国家科学基金会;
关键词
nectar; nectaries; nectary; PIN6; MYB57; Arabidopsis; DIFFERENTIAL GENE-EXPRESSION; BOX PROTEIN TIR1; ARABIDOPSIS-THALIANA; PLANT DEVELOPMENT; FLORAL NECTAR; STARCH METABOLISM; AUX/IAA PROTEINS; RNA-SEQ; FLOWERS; BIOSYNTHESIS;
D O I
10.1111/tpj.12184
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
The PIN family of proteins is best known for its involvement in polar auxin transport and tropic responses. PIN6 (At1g77110) is one of the remaining PIN family members in Arabidopsis thaliana to which a biological function has not yet been ascribed. Here we report that PIN6 is a nectary-enriched gene whose expression level is positively correlated with total nectar production in Arabidopsis, and whose function is required for the proper development of short stamens. PIN6 accumulates in internal membranes consistent with the ER, and multiple lines of evidence demonstrate that PIN6 is required for auxin-dependent responses in nectaries. Wild-type plants expressing auxin-responsive DR5:GFP or DR5:GUS reporters displayed intense signal in lateral nectaries, but pin6lateral nectaries showed little or no signal for these reporters. Further, exogenous auxin treatment increased nectar production more than tenfold in wild-type plants, but nectar production was not increased in pin6 mutants when treated with auxin. Conversely, the auxin transport inhibitor N-1-naphthylphthalamic acid (NPA) reduced nectar production in wild-type plants by more than twofold, but had no significant effect onpin6lines. Interestingly, a MYB57 transcription factor mutant, myb57-2, closely phenocopied the loss-of-function mutant pin6-2. However, PIN6 expression was not dependent on MYB57, and RNA-seq analyses of pin6-2 and myb57-2 mutant nectaries showed little overlap in terms of differentially expressed genes. Cumulatively, these results demonstrate that PIN6 is required for proper auxin response and nectary function in Arabidopsis. These results also identify auxin as an important factor in the regulation of nectar production, and implicate short stamens in the maturation of lateral nectaries.
引用
收藏
页码:893 / 904
页数:12
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