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BUZZ: an essential gene for postinitiation root hair growth and a mediator of root architecture in Brachypodium distachyon

Journal Article · · New Phytologist
DOI:https://doi.org/10.1111/nph.19079· OSTI ID:1991247
 [1];  [2];  [2];  [3];  [2];  [2];  [4];  [2];  [2];  [2];  [5];  [2]
  1. Washington State University, Pullman, WA (United States); University of Massachusetts Amherst
  2. Washington State University, Pullman, WA (United States)
  3. Washington State University, Pullman, WA (United States); South Dakota State University, Brookings, SD (United States)
  4. Northeast Normal University, Changchun (China)
  5. University of Massachusetts, Amherst, MA (United States)
Here, we discover a player in root development. Recovered from a forward-genetic screen in Brachypodium distachyon, the buzz mutant initiates root hairs but they fail to elongate. In addition, buzz roots grow twice as fast as wild-type roots. Also, lateral roots show increased sensitivity to nitrate, whereas primary roots are less sensitive to nitrate. Using whole-genome resequencing, we identified the causal single nucleotide polymorphism as occurring in a conserved but previously uncharacterized cyclin-dependent kinase (CDK)-like gene. The buzz mutant phenotypes are rescued by the wild-type B. distachyon BUZZ coding sequence and by an apparent homolog in Arabidopsis thaliana. Moreover, T-DNA mutants in A. thaliana BUZZ have shorter root hairs. BUZZ mRNA localizes to epidermal cells and develops root hairs and, in the latter, partially colocalizes with the NRT1.1A nitrate transporter. Based on qPCR and RNA-Seq, buzz overexpresses ROOT HAIRLESS LIKE SIX-1 and -2 and misregulates genes related to hormone signaling, RNA processing, cytoskeletal, and cell wall organization, and to the assimilation of nitrate. Overall, these data demonstrate that BUZZ is required for tip growth after root hair initiation and root architectural responses to nitrate.
Research Organization:
University of Massachusetts, Amherst, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB); Washington State University CAHNRS Emerging Research Initiative
Grant/Contract Number:
FG02-03ER15421
OSTI ID:
1991247
Alternate ID(s):
OSTI ID: 2483316
Journal Information:
New Phytologist, Journal Name: New Phytologist Journal Issue: 5 Vol. 239; ISSN 0028-646X
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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