Abstract
| Original language | English |
|---|---|
| Pages (from-to) | 873-883 |
| Number of pages | 11 |
| Journal | Journal of Plant Research |
| Volume | 130 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 2017 |
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Vascular development of the grapevine (Vitis vinifera L.) inflorescence rachis in response to flower number, plant growth regulators and defoliation. / Gourieroux, Aude M.; Holzapfel, Bruno P.; McCully, Margaret E.; Scollary, Geoffrey R.; Rogiers, Suzy Y.
In: Journal of Plant Research, Vol. 130, No. 5, 2017, p. 873-883.Research output: Contribution to journal › Article
TY - JOUR
T1 - Vascular development of the grapevine (Vitis vinifera L.) inflorescence rachis in response to flower number, plant growth regulators and defoliation
AU - Gourieroux, Aude M.
AU - Holzapfel, Bruno P.
AU - McCully, Margaret E.
AU - Scollary, Geoffrey R.
AU - Rogiers, Suzy Y.
PY - 2017
Y1 - 2017
N2 - The grapevine inflorescence is a determinate panicle and as buds emerge, shoot, flower and rachis development occur simultaneously. The growth and architecture of the rachis is determined by genetic and environmental factors but here we examined the role of flower and leaf number as well as hormones on its elongation and vascular development. The consequences of rachis morphology and vascular area on berry size and composition were also assessed. One week prior to anthesis, Merlot and Cabernet Sauvignon field vines were exposed to manual flower removal, exogenous plant growth regulators or pre-bloom leaf removal. Manual removal of half the flowers along the vertical axis of the inflorescence resulted in a shorter rachis in both cultivars. Conversely, inflorescences treated with gibberellic acid (GA3) and the synthetic cytokinin, 6-benzylaminopurine (BAP) resulted in a longer rachis while pre-bloom removal of all leaves on the inflorescence-bearing shoot did not alter rachis length relative to untreated inflorescences. Across the treatments, the cross-sectional areas of the conducting xylem and phloem in the rachis were positively correlated to rachis girth, flower number at anthesis, bunch berry number, bunch berry fresh mass and bunch sugar content at harvest. Conversely, average berry size and sugar content were not linked to rachis vascular area. These data indicate that the morphological and vascular development of the rachis was more responsive to flower number and plant growth regulators than to leaf removal.
AB - The grapevine inflorescence is a determinate panicle and as buds emerge, shoot, flower and rachis development occur simultaneously. The growth and architecture of the rachis is determined by genetic and environmental factors but here we examined the role of flower and leaf number as well as hormones on its elongation and vascular development. The consequences of rachis morphology and vascular area on berry size and composition were also assessed. One week prior to anthesis, Merlot and Cabernet Sauvignon field vines were exposed to manual flower removal, exogenous plant growth regulators or pre-bloom leaf removal. Manual removal of half the flowers along the vertical axis of the inflorescence resulted in a shorter rachis in both cultivars. Conversely, inflorescences treated with gibberellic acid (GA3) and the synthetic cytokinin, 6-benzylaminopurine (BAP) resulted in a longer rachis while pre-bloom removal of all leaves on the inflorescence-bearing shoot did not alter rachis length relative to untreated inflorescences. Across the treatments, the cross-sectional areas of the conducting xylem and phloem in the rachis were positively correlated to rachis girth, flower number at anthesis, bunch berry number, bunch berry fresh mass and bunch sugar content at harvest. Conversely, average berry size and sugar content were not linked to rachis vascular area. These data indicate that the morphological and vascular development of the rachis was more responsive to flower number and plant growth regulators than to leaf removal.
KW - Bunch stem
KW - Gibberellic acid
KW - Grapevine
KW - Inflorescence
KW - Leaf removal
KW - Phloem
KW - Rachis
KW - Xylem
UR - http://www.scopus.com/inward/record.url?scp=85017590079&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85017590079&partnerID=8YFLogxK
U2 - 10.1007/s10265-017-0944-2
DO - 10.1007/s10265-017-0944-2
M3 - Article
VL - 130
SP - 873
EP - 883
JO - The Botanical Magazine Tokyo
JF - The Botanical Magazine Tokyo
SN - 0006-808X
IS - 5
ER -