Linked Life Data

17619151

Source:http://linkedlifedata.com/resource/pubmed/id/17619151

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1-2
pubmed:dateCreated
2007-8-10
pubmed:abstractText
Increasing its root to shoot ratio is a plant strategy for restoring water homeostasis in response to the long-term imposition of mild water stress. In addition to its important role in diverse fundamental processes, indole-3-acetic acid (IAA) is involved in root growth and development. Recent extensive characterizations of the YUCCA gene family in Arabidopsis and rice have elucidated that member's function in a tryptophan-dependent IAA biosynthetic pathway. Through forward- and reverse-genetics screening, we have isolated Tos17 and T-DNA insertional rice mutants in a CONSTITUTIVELY WILTED1 (COW1) gene, which encodes a new member of the YUCCA protein family. Homozygous plants with either a Tos17 or T-DNA-inserted allele of OsCOW1 exhibit phenotypes of rolled leaves, reduced leaf widths, and lower root to shoot ratios. These phenotypes are evident in seedlings as early as 7-10 d after germination, and remain until maturity. When oscow1 seedlings are grown under low-intensity light and high relative humidity, the rolled-leaf phenotype is greatly alleviated. For comparison, in such conditions, the transpiration rate for WT leaves decreases approx. 5- to 10-fold, implying that this mutant trait results from wilting rather than being a morphogenic defect. Furthermore, a lower turgor potential and transpiration rate in their mature leaves indicates that oscow1 plants are water-deficient, due to insufficient water uptake that possibly stems from that diminished root to shoot ratio. Thus, our observations suggest that OsCOW1-mediated IAA biosynthesis plays an important role in maintaining root to shoot ratios and, in turn, affects water homeostasis in rice.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Sep
pubmed:issn
0167-4412
pubmed:author
pubmed:issnType
Print
pubmed:volume
65
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
125-36
pubmed:meshHeading
pubmed-meshheading:17619151-Amino Acid Sequence, pubmed-meshheading:17619151-DNA, Bacterial, pubmed-meshheading:17619151-Gene Expression Regulation, Enzymologic, pubmed-meshheading:17619151-Gene Expression Regulation, Plant, pubmed-meshheading:17619151-Genes, Plant, pubmed-meshheading:17619151-Homeostasis, pubmed-meshheading:17619151-Indoleacetic Acids, pubmed-meshheading:17619151-Molecular Sequence Data, pubmed-meshheading:17619151-Multigene Family, pubmed-meshheading:17619151-Mutation, pubmed-meshheading:17619151-Oryza sativa, pubmed-meshheading:17619151-Oxygenases, pubmed-meshheading:17619151-Phenotype, pubmed-meshheading:17619151-Phylogeny, pubmed-meshheading:17619151-Plant Roots, pubmed-meshheading:17619151-Plant Shoots, pubmed-meshheading:17619151-Sequence Alignment, pubmed-meshheading:17619151-Sequence Homology, Amino Acid, pubmed-meshheading:17619151-Tryptamines, pubmed-meshheading:17619151-Water
pubmed:year
2007
pubmed:articleTitle
Constitutively wilted 1, a member of the rice YUCCA gene family, is required for maintaining water homeostasis and an appropriate root to shoot ratio.
pubmed:affiliation
National Research Laboratory of Plant Functional Genomics, Division of Molecular and Life Sciences, Pohang University of Science and Technology, Pohang, Korea.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't