In:
Journal of the American Society for Horticultural Science, American Society for Horticultural Science, Vol. 141, No. 4 ( 2016-07), p. 389-394
Abstract:
Gibberellins (GAs) are phytohormones that regulate plant height and flowering time in plants. Plants with reduced GA or disrupted in GA signaling exhibit a dwarf phenotype. DELLA proteins are transcriptional repressors that attenuate GA-mediated promotion of plant growth. Alleles in which the eponymous DELLA motif in these proteins is disrupted result in constitutive repression of GA signaling and a dominantly inherited dwarf phenotype. We found that the dwarf Helianthus annuus (sunflower) cultivar Sunspot is hyposensitive to GA 3 as compared with the tall cultivar Mammoth Grey. Sequencing of the HaDella1 gene indicates that ‘Sunspot’ has a single nucleotide polymorphism resulting in a missense mutation in the DELLA motif as compared with ‘Mammoth Grey’ and the reference sequence. Helianthus annuus has five genes encoding DELLA proteins, including HaDella1 . We propose that the DELLA motif alteration in the HaDella1 gene results in a dominant mutation in ‘Sunspot’ and is the cause of its dwarf phenotype.
Type of Medium:
Online Resource
ISSN:
0003-1062
,
2327-9788
DOI:
10.21273/JASHS.141.4.389
Language:
Unknown
Publisher:
American Society for Horticultural Science
Publication Date:
2016
detail.hit.zdb_id:
2040057-3
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