{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,20]],"date-time":"2025-11-20T19:09:37Z","timestamp":1763665777287,"version":"build-2065373602"},"reference-count":129,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2025,8,15]],"date-time":"2025-08-15T00:00:00Z","timestamp":1755216000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Britton Fund","award":["SCBGP-FB18-14","SCBGP20-18"],"award-info":[{"award-number":["SCBGP-FB18-14","SCBGP20-18"]}]},{"name":"Arizona Department of Agriculture (ADA) Specialty Crop","award":["SCBGP-FB18-14","SCBGP20-18"],"award-info":[{"award-number":["SCBGP-FB18-14","SCBGP20-18"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Viruses"],"abstract":"<jats:p>Witches\u2019 broom disease of blue palo verde (Parkinsonia florida) was reported more than sixty years ago. Characteristic symptoms consist of dense clusters of shortened, brittle branches and stunted leaves. The suspect causal agent has been identified as palo verde broom virus (PVBV), genus, Emaravirus, family, Fimoviridae. Here, the first complete PVBV genome sequence was determined, and virus small interfering RNAs (vsiRNAs), primary metabolites, and phytohormone profiles were characterized from infected palo verde leaves, adventitious shoots, flowers, and seeds. Based on pairwise distances, PVBV RNAs 1\u20134 shared 54\u201365% nucleotide identity and 19\u201351% amino acid similarity, respectively, with other emaraviruses, while PVBV RNA 5 shared no sequence homology with any emaravirus. The 21\u201324-nt virus-derived vsiRNAs, indicative of post-transcriptional gene silencing (PTGS), represented nearly the entire PVBV genome in flowers, leaves, seeds, and adventitious shoots; however, PVBV RNA 3 and RNA 4 were most heavily targeted in all plant parts. Evidence that six major phytohormones were altered in PVBV-infected compared to virus-free trees indicated that emaravirus-infected trees mount classical defense responses to virus infection and\/or eriophyid mite infestations. Detection of PVBV RNA genome segments 1\u20135, accumulation of predominantly 21-nt vsiRNAs, homologous to the PVBV genome and transcripts, and altered levels of phytohormones and metabolites in PVBV-infected trees strongly implicate PVBV as the causal agent of witches\u2019 broom disease.<\/jats:p>","DOI":"10.3390\/v17081122","type":"journal-article","created":{"date-parts":[[2025,8,15]],"date-time":"2025-08-15T14:24:28Z","timestamp":1755267868000},"page":"1122","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["First Complete Genome Sequence of Palo Verde Broom Emaravirus, Virus-Derived siRNA Signatures, and Phytohormone-Metabolite Profiling of Witches\u2019 Broom-Affected Palo Verde Trees"],"prefix":"10.3390","volume":"17","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0608-2970","authenticated-orcid":false,"given":"Raphael O.","family":"Adegbola","sequence":"first","affiliation":[{"name":"School of Plant Sciences, The University of Arizona, 1140 E South Campus Drive, Tucson, AZ 85721, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Muhammad","family":"Ilyas","sequence":"additional","affiliation":[{"name":"School of Plant Sciences, The University of Arizona, 1140 E South Campus Drive, Tucson, AZ 85721, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4287-8677","authenticated-orcid":false,"given":"Dinusha C.","family":"Maheepala","sequence":"additional","affiliation":[{"name":"School of Plant Sciences, The University of Arizona, 1140 E South Campus Drive, Tucson, AZ 85721, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ursula K.","family":"Schuch","sequence":"additional","affiliation":[{"name":"School of Plant Sciences, The University of Arizona, 1140 E South Campus Drive, Tucson, AZ 85721, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4669-8443","authenticated-orcid":false,"given":"Judith K.","family":"Brown","sequence":"additional","affiliation":[{"name":"School of Plant Sciences, The University of Arizona, 1140 E South Campus Drive, Tucson, AZ 85721, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2025,8,15]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"128","DOI":"10.2307\/3088735","article-title":"Dieback and Episodic Mortality of Cercidium Microphyllum (Foothill Paloverde), a Dominant Sonoran Desert Tree","volume":"128","author":"Bowers","year":"2001","journal-title":"J. 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