Abscisic acid employs NRP‐dependent PIN2 vacuolar degradation to suppress auxin‐mediated primary root elongation in Arabidopsis

2021 ◽  
Author(s):  
Yanying Wu ◽  
Yue Chang ◽  
Liming Luo ◽  
Wenqi Tian ◽  
Qingqiu Gong ◽  
...  
Keyword(s):  
Abscisic Acid ◽  
Root Elongation ◽  
Primary Root

Primary Root Elongation Rate and Abscisic Acid Levels of Maize in Response to Water Stress

Crop Science ◽  
2011 ◽  
Vol 51 (1) ◽  
pp. 157-172 ◽  
Author(s):  
Kristen A. Leach ◽  
Lindsey G. Hejlek ◽  
Leonard B. Hearne ◽  
Henry T. Nguyen ◽  
Robert E. Sharp ◽  
...  
Keyword(s):  
Abscisic Acid ◽  
Water Stress ◽  
Root Elongation ◽  
Primary Root ◽  
Elongation Rate ◽  
Root Elongation Rate ◽  
Response To Water

scholarly journals Abscisic acid modulates auxin-responsive hypocotyl elongation

2021 ◽  
Author(s):  
Ryan Emenecker ◽  
Joseph Cammarata ◽  
Irene Yuan ◽  
Lucia Strader
Keyword(s):  
Abscisic Acid ◽  
Root Elongation ◽  
Plant Hormone ◽  
Primary Root ◽  
Hypocotyl Elongation ◽  
Forward Genetics ◽  
Rna Seq ◽  
Wild Type ◽  
Inhibitory Effects ◽  
Aba Biosynthesis

Auxin regulates many aspects of plant growth and development in concert with other plant hormones. Auxin interactions with these other phytohormones to regulate distinct processes is not fully understood. Using a forward genetics screen designed to identify seedlings resistant to the suppressive effects of auxin on dark-grown hypocotyl elongation, we identified a mutant defective in ABA ALDEHYDE OXIDASE3 (AAO3), which encodes for the enzyme that carries out the final step in the biosynthesis of the plant hormone abscisic acid (ABA). We found that all examined ABA deficient mutants display resistance to the inhibitory effects of auxin on dark-grown hypocotyl elongation, suggesting that aspects of ABA signaling are downstream of auxin in regulating dark-grown hypocotyl elongation. Conversely, these mutants display wild type responsiveness to auxin in root elongation assays, suggesting that ABA does not act downstream of auxin in regulating elongation of the root. Our RNA-seq analysis suggests that many auxin-repressed genes in the hypocotyl require an intact ABA pathway for full repression. Our results suggest a model in which auxin partially requires intact ABA biosynthesis in order to regulate hypocotyl elongation, but not to regulate primary root elongation, suggesting that the genetic interactions between these two pathways are tissue-dependent.

Confirmation that abscisic acid accumulation is required for maize primary root elongation at low water potentials

1994 ◽  
Vol 45 (Special_Issue) ◽  
pp. 1743-1751 ◽  
Author(s):  
Robert E. Sharp ◽  
Yajun Wu ◽  
Gary S. Voetberg ◽  
Imad N. Saab ◽  
Mary E. LeNoble
Keyword(s):  
Abscisic Acid ◽  
Root Elongation ◽  
Primary Root ◽  
Water Potentials ◽  
Acid Accumulation

scholarly journals Abscisic Acid Accumulation Maintains Maize Primary Root Elongation at Low Water Potentials by Restricting Ethylene Production

2000 ◽  
Vol 122 (3) ◽  
pp. 967-976 ◽  
Author(s):  
William G. Spollen ◽  
Mary E. LeNoble ◽  
Timmy D. Samuels ◽  
Nirit Bernstein ◽  
Robert E. Sharp
Keyword(s):  
Abscisic Acid ◽  
Ethylene Production ◽  
Root Elongation ◽  
Primary Root ◽  
Water Potentials ◽  
Acid Accumulation

scholarly journals Two Expansin Genes, AtEXPA4 and AtEXPB5, Are Redundantly Required for Pollen Tube Growth and AtEXPA4 Is Involved in Primary Root Elongation in Arabidopsis thaliana

Genes ◽  
2021 ◽  
Vol 12 (2) ◽  
pp. 249
Author(s):  
Weimiao Liu ◽  
Liai Xu ◽  
Hui Lin ◽  
Jiashu Cao
Keyword(s):  
Arabidopsis Thaliana ◽  
Pollen Tube ◽  
Pollen Tube Growth ◽  
Cell Walls ◽  
Root Elongation ◽  
Expression Patterns ◽  
Primary Root ◽  
Pollen Grains ◽  
Tube Growth ◽  
Cell Wall Binding

The growth of plant cells is inseparable from relaxation and expansion of cell walls. Expansins are a class of cell wall binding proteins, which play important roles in the relaxation of cell walls. Although there are many members in expansin gene family, the functions of most expansin genes in plant growth and development are still poorly understood. In this study, the functions of two expansin genes, AtEXPA4 and AtEXPB5 were characterized in Arabidopsis thaliana. AtEXPA4 and AtEXPB5 displayed consistent expression patterns in mature pollen grains and pollen tubes, but AtEXPA4 also showed a high expression level in primary roots. Two single mutants, atexpa4 and atexpb5, showed normal reproductive development, whereas atexpa4atexpb5 double mutant was defective in pollen tube growth. Moreover, AtEXPA4 overexpression enhanced primary root elongation, on the contrary, knocking out AtEXPA4 made the growth of primary root slower. Our results indicated that AtEXPA4 and AtEXPB5 were redundantly involved in pollen tube growth and AtEXPA4 was required for primary root elongation.

scholarly journals The bacterial volatile N,N-dimethyl-hexadecylamine promotes Arabidopsis primary root elongation through cytokinin signaling and the AHK2 receptor

2021 ◽  
Vol 16 (4) ◽  
pp. 1879542
Author(s):  
Ernesto Vázquez-Chimalhua ◽  
Salvador Barrera-Ortiz ◽  
Eduardo Valencia-Cantero ◽  
José López-Bucio ◽  
León Francisco Ruiz-Herrera
Keyword(s):  
Root Elongation ◽  
Primary Root ◽  
Cytokinin Signaling

Early Pinus caribaea var. hondurensis root development. 2. Influence of soil strength

1996 ◽  
Vol 36 (7) ◽  
pp. 847 ◽  
Author(s):  
A Costantini ◽  
D Doley ◽  
HB So
Keyword(s):  
Root Development ◽  
Soil Type ◽  
Root Elongation ◽  
Primary Root ◽  
High Strength ◽  
Soil Strength ◽  
Shoot Development ◽  
Pinus Caribaea ◽  
Primary Shoot ◽  
Primary Roots

The influence of penetration resistance (PR), an easily measured indicator of soil strength, on the growth of Pinus caribaea var. hondurensis radicles and seedlings was investigated. Negative exponential relationships between PR and both radicle and primary root elongation were observed. All root elongation ceased at PR levels of 3.25 MPa. Tip diameters of radicles and primary roots were positively correlated with PR values up to 2.4 MPa, whilst numbers of primary roots, total root lengths and lengths of longest roots were all negatively correlated with PR. Hypocotyl elongation was also reduced by increasing PR, although the reductions occurred at higher PRs than those which inhibited root development. In contrast, primary shoot development was unaffected by PR levels which were sufficient to stop root elongation, but was reduced in soil with a PR of 4.8 MPa. There were significant family x soil type and family x PR interactions for radicle, hypocotyl, primary root and primary shoot development. 1f these interactions are correlated with performance in the field, then they may serve as useful indicators of family suitability to both soil type and high strength soils.

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