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Preliminary Studies on Flowering Control by Means of Photoperiod in Coreopsis Grandiflora ’Early Sunrise’

Author: HuXiaoLong
Tutor: HuHuiRong
School: Huazhong Agricultural University
Course: Ornamental Plants and Horticulture
Keywords: Big Flower Coreopsis Moved to light Quantitative long day plant The Young Flower bud differentiation
CLC: S682.11
Type: Master's thesis
Year: 2007
Downloads: 139
Quote: 4
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Abstract


Big Flower Coreopsis is very important in the modern garden perennial flowers, mainly used in today's more stylish flower border design 'dawn' varieties in plant configuration. Better meet the needs of production and consumption, it is necessary to carry out the flowering control. Using light cycle regulation has a simple, pollution-free, quantitative analysis of 'dawn' big flower Jinji daisy photoperiod characteristics, which can directly guide large-scale production. The main results of this study are as follows: ① 'dawn' Big Flower Coreopsis is a quantitative long-day plants, long day, higher plants, plant width, branching more. Long-day promotion of 'dawn' Big Flower Coreopsis flowering can accelerate flower production; the short photoperiod control 'dawn' Big Flower Coreopsis plant type. ② respectively, based on leaf number and emergence of the number of weeks, using Transitive light method measured: 'dawn' the big flower Coreopsis young the end of the 20-26 leaf stage, long day can speed up the young end of the process . Emergence number of weeks as a basis for relocation light, and simplifies the process of pilot studies; supplemented leaf number of observations for the production to provide a reliable parameter. ③ 'dawn' Big Flower Coreopsis flower bud differentiation process is divided into eight stages: vegetative growth early, late vegetative growth, inflorescence primordium bract primordium ray florets primordium, tubular flower primordium, tubular flower corolla and stamen primordium tubular flower pistil primordium. 'The Chenguang' Big Flower Coreopsis flower bud differentiation photoperiod response began in the first 17 weeks after emergence, LD and SD in the inflorescence primordium and nutrition early growth stage. ④ 'dawn' Big Flower Coreopsis exist in plant height, plant width, number of branches and flower bud differentiation period significant linear regression equation followed by plant height: y = 0.1308x 0.3052 (R ~ 2 = 0.8490) branch number: y = 0.1855x-0.7608 (R ~ 2 = .8096), plant width: y = 0.1239x-.2228 (R ~~ 2 = 0.7857), leaf number: y = 0.1855x-0.7608 (R ~~ 2 = 0.5603), the emergence of the number of weeks: y = 0.2258x-2.1650 (R-2 = 0.4471) and leaf division number (y = 0.3117x 1.660) (R-2 = 0.1902). The data analysis can be seen: the more sensitive indicators of light cycle, and the flower bud differentiation period; data derivation can come: long day on the 'dawn' Big Flower Coreopsis civilized induced major role in the inflorescence original base to the bract primordium differentiation stage.

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CLC: > Agricultural Sciences > Gardening > Ornamental Horticulture ( flowers and ornamental trees) > Perennial Flowers > Perennial Flowers Class > Chrysanthemum
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