Article

HPS4/SABRE regulates plant responses to phosphate starvation through antagonistic interaction with ethylene signalling.

MOE Key Laboratory of Bioinformatics, School of Life Sciences, Tsinghua University, Beijing, 100084, PR China.
Journal of Experimental Botany (impact factor: 5.36). 05/2012; 63(12):4527-38. DOI:10.1093/jxb/ers131 pp.4527-38
Source: PubMed

ABSTRACT The phytohormone ethylene plays important roles in regulating plant responses to phosphate (Pi) starvation. To date, however, no molecular components have been identified that interact with ethylene signalling in regulating such responses. In this work, an Arabidopsis mutant, hps4, was characterized that exhibits enhanced responses to Pi starvation, including increased inhibition of primary root growth, enhanced expression of Pi starvation-induced genes, and overproduction of root-associated acid phosphatases. Molecular cloning indicated that hps4 is a new allele of SABRE, which was previously identified as an important regulator of cell expansion in Arabidopsis. HPS4/SABRE antagonistically interacts with ethylene signalling to regulate plant responses to Pi starvation. Furthermore, it is shown that Pi-starved hps4 mutants accumulate more auxin in their root tips than the wild type, which may explain the increased inhibition of their primary root growth when grown under Pi deficiency.

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    Article: The maize aberrant pollen transmission 1 gene is a SABRE/KIP homolog required for pollen tube growth.
    Zhennan Xu, Hugo K Dooner
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    ABSTRACT: Maize (Zea mays) pollen tubes grow in the styles at a rate of >1 microm/sec. We describe here a gene required to attain that striking rate. The aberrant pollen transmission 1 (apt1) gene of maize was identified by an Ac-tagged mutation that displayed a severe pollen transmission deficit in heterozygotes. Rare apt1 homozygotes can be recovered, aided by phenotypic selection for Ac homozygotes. Half of the pollen in heterozygotes and most of the pollen in homozygotes germinate short and twisted pollen tubes. The apt1 gene is 26 kb long, makes an 8.6-kb pollen-specific transcript spliced from 22 exons, and encodes a protein of 2607 amino acids. The APT1 protein is homologous to SABRE and KIP, Arabidopsis proteins of unknown function involved in the elongation of root cortex cells and pollen tubes, respectively. Subcellular localization analysis demonstrates that APT1 colocalizes with a Golgi protein marker in growing tobacco pollen tubes. We hypothesize that the APT1 protein is involved in membrane trafficking and is required for the high secretory demands of tip growth in pollen tubes. The apt1-m1(Ac) mutable allele is an excellent tool for selecting Ac transpositions because of the strong negative selection pressure operating against the parental Ac site.
    Genetics 02/2006; 172(2):1251-61. · 4.01 Impact Factor
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Keywords

Arabidopsis mutant
 
cell expansion
 
ethylene signalling
 
hps4
 
HPS4/SABRE antagonistically interacts
 
increased inhibition
 
Molecular cloning
 
molecular components
 
overproduction
 
Pi
 
Pi deficiency
 
Pi starvation
 
Pi starvation-induced genes
 
Pi-starved hps4 mutants
 
plant responses
 
regulating plant responses
 
responses
 
roles
 
root tips
 
root-associated acid phosphatases
 

Hailan Yu