Effect of Continuous or Discontinuous Water Restrictions on the Architecture of Two- And Five-Months-Old Garden Rose (Rosa Hybrida 'Radrazz')

Huché-Thélier, Lydie; Morel, Philippe; Coz, E. Le; Sintes, Gérard; Guillemain, Gilles; Crespel, Laurent

doi:10.17660/actahortic.2013.990.45

Cited by 3 publications

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“…Consequently, relatively few long axes were exposed to water restriction which was applied after budbreak on order 2 axes, i.e., at the time of formation of higher order axes. In our study, significant decreases in the number of determined axes were mainly observed for orders 3 and 4 (Supplementary Table S1 ), as reported in R. hybrida ‘Radrazz’ submitted to drought/re-watering cycles ( Huché-Thélier et al, 2013 ).…”

Section: Discussionsupporting

confidence: 84%

“…Plant architecture is the result of the positioning of aerial organs in space according to organization rules specific to each species. It depends on two processes, growth and branching, which are controlled by genetic and environmental factors, including the quantity and quality of light ( Kawamura and Takeda, 2002 ; Niinemets and Lukjanova, 2003 ; Evers et al, 2006 ; Girault et al, 2008 ; Rameau et al, 2015 ), temperature ( Khayat and Zieslin, 1982 ; Battey, 2000 ) as well as water supply ( Cameron et al, 2006 ; Burnett and van Iersel, 2008 ; Demotes-Mainard et al, 2013 ; Huché-Thélier et al, 2013 ). Climate forecast models consider an average global rise in temperature of ∼2∘C between now and 2100, accompanied by an increase in the frequency of heat waves and droughts (IPCC, fifth assessment, 2013).…”

Section: Introductionmentioning

confidence: 99%

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Genotypic differences in architectural and physiological responses to water restriction in rose bush

et al. 2015

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The shape and, therefore, the architecture of the plant are dependent on genetic and environmental factors such as water supply. The architecture determines the visual quality, a key criterion underlying the decision to purchase an ornamental potted plant. The aim of this study was to analyze genotypic responses of eight rose bush cultivars to alternation of water restriction and re-watering periods, with soil water potential of -20 and -10 kPa respectively. Responses were evaluated at the architectural level through 3D digitalization using six architectural variables and at the physiological level by measuring stomatal conductance, water content, hormones [abscisic acid (ABA), auxin, cytokinins, jasmonic acid, and salicylic acid (SA)], sugars (sucrose, fructose, and glucose), and proline. Highly significant genotype and watering effects were revealed for all the architectural variables measured, as well as genotype × watering interaction, with three distinct genotypic architectural responses to water restriction – weak, moderate and strong – represented by Hw336, ‘Baipome’ and ‘The Fairy,’ respectively. The physiological analysis explained, at least in part, the more moderate architectural response of ‘Baipome’ compared to ‘The Fairy,’ but not that of Hw336 which is an interspecific hybrid. Such physiological responses in ‘Baipome’ could be related to: (i) the maintenance of the stimulation of budbreak and photosynthetic activity during water restriction periods due to a higher concentration in conjugated cytokinins (cCK) and to a lower concentration in SA; (ii) a better resumption of budbreak during the re-watering periods due to a lower concentration in ABA during this period. When associated with the six architectural descriptors, cCK, SA and ABA, which explained the genotypic differences in this study, could be used as selection criteria for breeding programs aimed at improving plant shape and tolerance to water restriction.

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Section: Discussionsupporting

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Genotypic differences in architectural and physiological responses to water restriction in rose bush

et al. 2015

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“…A composição e o desenvolvimento das gemas definem a arquitetura da copa em espécies lenhosas (BARTHÉLÉMY & CARAGLIO, 2007). O desenvolvimento da arquitetura da copa é controlado por fatores genéticos e ambientais (BARTHÉLÉMY & CARAGLIO, 2007), incluindo a disponibilidade de luz (GIRAULT et al, 2008;RAMEAU et al, 2015), água (DEMOTES-MAINARD et al, 2013;HUCHÉ-THÉLIER et al, 2013) e temperatura (BATTEY, 2000). As espécies lenhosas do cerrado stricto sensu apresentam diferentes padrões de ramificação da copa (SOUZA et al, 2011), capacidade de conquista do espaço aéreo, vulnerabilidade, simetria e complexidade das copas (PRADO et al, 2020).…”

Section: Introductionunclassified

Comparação do momento de brotação, conteúdo de gemas e arquitetura de copas entre espécies lenhosas de Cerrado stricto sensu e Floresta Estacional Semidecidual

Cruz

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No Cerrado existe uma ampla riqueza de fitofisionomias, incluindo o cerrado stricto sensu (CSS) e as florestas estacionais semideciduais (FES). A distribuição das plantas entre ambientes abertos e florestais são influenciados pelas características ambientais, como a intensidade luminosa. O objetivo deste estudo foi o de determinar a composição, abertura de gemas e as características da arquitetura da copa em espécies lenhosas que ocorrem em CSS e em FES. Nossa hipótese é que as características ambientais são determinantes sobre a composição e abertura de gemas e da arquitetura da copa das espécies ocorrentes no CSS e em FES. Cinco gemas de cada indivíduo de cada espécie foram coletadas em cada área de estudo e dissecadas. Em adição, foi determinado o período e o intervalo de abertura das gemas, além da esquematização de toda estrutura vegetativa acima do solo e a incidência de luz que chega nas copas de cada indivíduo de cada espécie lenhosa em cada área de estudo. As espécies de CSS apresentaram gemas maiores, com maior número de órgãos pré-formados que em FES. Todas as gemas das espécies lenhosas estudadas de CSS e de FES apresentaram tricomas. A presença de catafilos foi evidenciada apenas em Xylopia aromatica ocorrente no CSS e em FES, Bauhinia cfr. ungulata de CSS e Bauhinia cfr. rufa de FES. Xylopia aromatica apresentou dois tipos de gemas, uma simples, com catafilos ausentes e outra composta protegidas por catafilos, tanto em CSS e em FES. As espécies Miconia albicans de FES e CSS e B. cfr. ungulata iniciaram o desenvolvimento das gemas após o início do período chuvoso. Apenas B. cfr ungulata teve o aumento do número de gemas abertas correlacionado com o aumento da precipitação. Bauhinia cfr. rufa ocorrente em CSS iniciou o desenvolvimento das gemas no final da estação seca e X. aromatica ocorrente em CSS e FES apresentou gemas em desenvolvimento durante a estação seca e chuvosa, sendo X. aromatica a espécie com maior intervalo de tempo de abertura de gemas. As plantas que ocorrem em CSS, receberam maior intensidade de luz na copa do que as plantas de FES, o que pode ter influenciado no maior tamanho da gema nas espécies de CSS. O padrão da ramificação das copas das espécies lenhosas de CSS e de FES foram semelhantes nos dois ambientes, não sendo influenciada pela diferença de luz, o que sugere que as espécies lenhosas estudadas podem ter se desenvolvido em ambientes com uma ampla variabilidade de condições de luz ao longo do processo evolutivo. Palavras-chave: alometria; pré-formação; padrão de ramificação; neoformação.

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Heritability of Plant Architecture in Diploid Roses (Rosa spp.)

Wu¹,

Liang²,

Byrne³

2019

horts

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Plant architecture is a crucial trait in plant breeding because it is linked to crop yield. For ornamental crops such as roses, plant architecture is key for their aesthetic and economic value. In 2015, six rose plant architectural traits were evaluated on 2- to 3-year-old plants of F1 rose populations in May and December in College Station, TX, to estimate variability and heritability. The traits included plant height, the number of primary shoots, the length of primary shoots, the number of nodes on the primary shoot, the number of secondary shoots per primary shoot, and the number of tertiary shoots per primary shoot. Among these traits, plant height, the number of primary shoots, and the length of primary shoots showed a substantial amount of variability, whereas the number of secondary and tertiary shoots per primary shoot were skewed toward zero. Using a random effects model restricted maximum likelihood (REML) analysis, the architectural traits demonstrated low to moderate narrow-sense heritability (0.12–0.50) and low to high broad-sense heritability (0.34–0.92). Plant height and the number of primary shoots changed little after the first growth phase, whereas the other four traits were affected greatly by the genotype-by-environment (growth phase) interaction.

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Effect of Continuous or Discontinuous Water Restrictions on the Architecture of Two- And Five-Months-Old Garden Rose (Rosa Hybrida 'Radrazz')

Cited by 3 publications

References 0 publications

Genotypic differences in architectural and physiological responses to water restriction in rose bush

Genotypic differences in architectural and physiological responses to water restriction in rose bush

Comparação do momento de brotação, conteúdo de gemas e arquitetura de copas entre espécies lenhosas de Cerrado stricto sensu e Floresta Estacional Semidecidual

Heritability of Plant Architecture in Diploid Roses (Rosa spp.)

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