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Zhuping Fan, Yike Gao, Ling Guo, Ying Cao, Rong Liu, and Qixiang Zhang

distributed in a randomized complete block design, with three blocks in each population. To avoid contamination from other pollen, artificial emasculation was carried out the day before blooming, and the flowers were covered with bags after artificial

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David Shupert*, Natalie Anderson, and David Byrne

Seedlings from three interspecific backcross rose populations derived from a F1 population were used to study inheritance of several traits in roses. Three F1 plants (WOB13, WOB21, and WOB26) from the hybridization of the diploid parents Rosa wichuraiana and `Old Blush' were backcrossed to `Old Blush' to produced three populations to observe the segregation of several morphological and disease resistance traits. The segregating rose traits in the backcrosses are no prickles on stems, non-recurrent blooming habit, white single flowers, black spot resistance, and powdery mildew resistance present in the Rosa wichuraiana parent compared to prickles on stems, recurrent blooming habit, pink double flowers, black spot susceptible, and powdery mildew susceptible present in the `Old Blush' parent. Visual data was collected for the segregating traits using color standards and rating scales as appropriate. The three populations expressed the segregating traits to varying degrees. Under the environmental conditions at College Station, Texas the population `Old Blush' × WOB26 had a greater expression of the traits for no prickles on stems, recurrent blooming habit, disease resistance to black spot, and disease resistance to powdery mildew, which are traits desired in breeding programs. The segregation of flower color (white/pink), and flower type (single, semi double, and double) were similar in all three populations.

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Warner Orozco-Obando, Gwen N. Hirsch, and Hazel Y. Wetzstein

The general doctrine of flowering in Hydrangea macrophylla (Thunb.) Ser. is that floral induction occurs during the fall months with the flower appearing the following spring or summer. However, hydrangea cultivars differ widely in their relative abundance and duration of flower production. The objective of this study was to determine how developmental flowering patterns compared among different hydrangea genotypes. Flowering was characterized in 18 cultivars by assessing flower initiation in dormant buds of 1-year-old stems that received natural outdoor inductive conditions. Terminal and lateral buds were dissected and floral developmental stage categorized microscopically. In terminal buds, flower development was very consistent and occurred in 100% of buds for all cultivars except `Ayesha' (33%). In contrast, lateral buds showed a wide variation in flower induction among genotypes. `Ayesha', `Blushing Pink', `Freudenstein', and `Nigra' had 10% or fewer lateral buds with floral initials. `All Summer Beauty', `David Ramsey', `Masja', `Nightingale', and `Penny Mac' showed high levels of floral induction (>92%). Within a cultivar, flower development was more advanced in terminal than lateral buds. In several cultivars, a significant correlation between bud size (length) and floral stage was found. However, low r-square values indicated that flower stage was explained largely due to factors other than bud length. This study shows that floral induction patterns vary markedly among hydrangea cultivars and provides insight into why cultivars differ in the extent and reliability of seasonal blooming. Genotypes that possess floral primordia in lateral buds would be amenable to cultural practices that enhance lateral budbreak and recurrent blooming.

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David H. Byrne, Patricia Klein, Muqing Yan, Ellen Young, Jeekin Lau, Kevin Ong, Madalyn Shires, Jennifer Olson, Mark Windham, Tom Evans, and Danielle Novick

species is used as a source of resistance (or other trait), the cycle becomes longer, as the first step would be to convert the wild germplasm into a remontant or recurrent blooming type. As the recurrent gene is recessive, the initial hybrids are once

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Kevin M. Folta

genetic control is conferred by SEASONAL FLOWERING LOCUS (SFL; Brown and Wareing, 1965 ) and in rose it is encoded by RECURRENT BLOOMING (RB; Semeniuk, 1971 ). As rose and strawberry are phylogenetic neighbors, it may be assumed that a common mechanism

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David C. Zlesak

. There were 10 replications for each trait per cultivar (except floral data were not collected for ‘Nugget’ because it had finished blooming by this date). For internode length and flowering traits, each data point was taken from a different stem

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Derald Harp, Gaye Hammond, David C. Zlesak, Greg Church, Mark Chamblee, and Steve George

, 2013 ; Waliczek et al., 2015 ). Consumers are less willing or able to spend time in their gardens treating plants for recurrent pest and disease problems ( Harp et al., 2009 ; Waliczek et al., 2015 ; Zlesak et al., 2017 ). These traits are possessed

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Yihua Chen, Peng Jiang, Shivegowda Thammannagowda, Haiying Liang, and H. Dayton Wilde

habit of rose ( Rosa sp.) has been altered by centuries of breeding for the recessive locus recurrent blooming ( Iwata et al., 2012 ). Rb was recently identified as a TFL1 ortholog and rose cultivars with low RoTFL1 expression bloom repetitively

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Weijian Cai, Jason D. Zurn, Nahla V. Bassil, and Kim E. Hummer

produced were SF, blooming in the spring and producing one fruit crop per summer. PF forms of the diploid alpine strawberry, F. vesca subsp. vesca f. semperflorens , were common in Europe when Linnaeus named the genus ( Duchesne, 1766 ). F

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Claudia Negrón, Loreto Contador, Bruce D. Lampinen, Samuel G. Metcalf, Theodore M. DeJong, Yann Guédon, and Evelyne Costes

of a model. In the estimated model, States 3, 4, and 5 had similar observation probabilities as States 6, 7, and 8, respectively. Therefore, in this cultivar, a seven-state initial model with three recurrent states was used (i.e., transitions from