PHYSIOLOGY & EC CROPS
PHYSIOLOGY & EC CROPS AGR 4512
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This 8 page Class Notes was uploaded by Elaina Gorczany on Friday September 18, 2015. The Class Notes belongs to AGR 4512 at University of Florida taught by Jerry Bennett in Fall. Since its upload, it has received 14 views. For similar materials see /class/206612/agr-4512-university-of-florida in Agricultural & Resource Econ at University of Florida.
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Date Created: 09/18/15
CHAPTER 12 FLOWERING AND FRUITING Factors that initiate change from vegetative to reproductive growth 1 Photo eriod enth of da niht 2 Temperature 3 Time Although we talk about short and long day plants it is actually the night period that results in flowering in photoperiod responsive plants Nzctoperiod length of night period For photoperiod responsive plants interruption of night with light flashes prevents flowering in shortday plants while interruption of light with dark periods has no effect on flowering Factors Affecting Photoperiod and Temperature Latitude Time of year sun declination 4 0 Winter months in northern hemisphere Vernilization Some plants will not flower even if grown in an optimal photoperiod unless they are exposed to a cold period during vegetative growth This cold period known as VERNALIZATION wneat sugarpeet rye P Phytochrome pigment exists in a red form Pr or farred Pfr form Temperature modifies the reversion of Pfr to Pr Warm temperature increases rate of Pfr to Pr Receptors of photopgriod Leaves Receptors of vernalization Meristems Florigequot hypothesized as plantproduced verna39ization hormones that promote flowering Neither compound has been isolated or characterized so their existence remains onl conecture SHORTDAY PLANT LONGDAV PLANT Fi 122 Generalized TIME To FLOWERINva vPv Pl P umml anirmn maximum PHOTOPERIOD p Reproductive Growth Floral initiation occurs after floral induction and is the morphological transition of meristems from a vegetative to a floral state Fruit set Failure of most flowers to set fruit is the rule rather than the exception 50 to 75 failure is not uncommon Reasons Lack of pollination leaf desiccation and fertilization weak pollen incompatibility abortion of flowers and fruits REPRODUCTIVE GROWTH 1 Flowerinduction 2 Flowerinitiation 3 Pollination 4 Fertilization 5 Seed set 6 Seed growth 7 Seed maturation
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