The 23rd Session of the International Poplar Commission The Mechanism of 2n Pollen Formatiom in Populus × euramericana and P. × popularis Speaker Jin-feng Zhang (Jennifer) zjf@bjfu.edu.cn Beijing Forestry University P.R.China OUTLINE 1 Introduction 2 Materials and Methods 3 Results and Analysis 4 Discussion 1 Introduction 1.1 Polyploid breeding is an important part in poplar breeding ● ● Triploid white poplar trees Triploid and aneuploid hybrids in Populus trichocarpa ×
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filament topped by an anther with pollen sacs that produce pollen d. Carpel has a long style with a stigma on which pollen may land e. Ovary at the base of the style‚ containing one or more ovules f. Pistil- single carpel or group of fused carpels Stamen Anther Filament Stigma Carpel Style Ovary Receptacle Sepal Petal (a) Structure of an idealized flower Fig. 38-5a Stigma Pollen tube 2 sperm Style Ovary
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relationship with plants because they are able to get rewards such as pollen and nectar. With these they have the ability to continue on with their daily work. Applying Your Knowledge 1. The rise in prominence of one major group does not necessarily result in the total replacement of a previously dominant group because one group may work better in the part than the other group. Gymnosperms for example produce excess amount of pollen‚ they are wind pollinated and they reach the appropriate species
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fertile parts of the flower c. Androecium * Microsporophylls * House of man d. Gynoecium * The carpels‚ house of women * Megasporophylls that are folwed lengthwise enclosing one or more ovules e. Stigma * Receives the pollen f. Ovary * Enclosed the ovules 2. The Ovules Are Attached to the Ovary Wall at the Placenta a. Placenta * The portion of the ovary where the ovules originate and to which they remain attached until maturity b. Placentation
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“How Flowers Changed the World” Questions and Answers 1. Eiseley states that observers from the far side of our solar system could have perceived only one change in the whole history of the planet Earth. Describe this change and explain what would have been responsible for it. a. Eiseley says they would be able to “discern a subtle change in the light emanating from our planet”. What Eiseley is talking about is the evolution of earth from a place with red deserts like Mars and blackness of naked
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Expt. 7. Sexual Plant Reproduction: Testing conditions required for pollen germination and tube growth ____________________________________________________________________________ File: pollen Modified from E. Moctezuma & others for BSCI 442 (Sze) Objectives: Get familiar with the parts of flowers: male and female organs Observe pollen germination and tube growth in real time. Test the conditions that stimulate pollen germination and tube growth. Observe cytoplasmic streaming (due to
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CHAPTER 2 SEXUAL REPRODUCTION IN FLOWERING PLANTS 2.1 2.2 2.3 2.4 2.5 Flower – A Fascinating Organ of Angiosperms Pre-fertilisation : Structures and Events Double Fertilisation Post-fertilisation: Structures and Events Apomixis and Polyembryony Are we not lucky that plants reproduce sexually? The myriads of flowers that we enjoy gazing at‚ the scents and the perfumes that we swoon over‚ the rich colours that attract us‚ are all there as an aid to sexual reproduction. Flowers do not exist only
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such as cucurbits‚ which may exhibit poor pollination by fruitabortion‚ fruit deformity or poor maturation. Hand-pollination is an option only on a small scale‚ but is a common technique by home and small market gardeners‚ involving the transfer of pollen with an artist’s brush or cotton swab from male to female flowers. Sometimes the corolla is removed from male flowers and the flower itself is brushed against the stigmas of female flowers. The principal reasons for hand pollination include a paucity
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A Term Paper On The Importance of Male Sterility and self incompatibility in crop improvement By Idu Paul Odey CONTENT 0. Introduction 1. Male Sterility (MS) and Self-Incompatibility 1. Male Sterility (MS) 2. Self-Incompatibility (SI) 2. Types of Male Sterility and Self-Incompatibility Systems 1. Types of Male Sterility 2. Types of Self-Incompatibility 3. How MS and SI affect Reproduction in plant and correction
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pistil and stamens. Sepals once covered the flower buds‚ but eventually open up. The petals are there to attract pollinators such as bees and humming birds. Petals attract pollinators so that they can transport pollen from flower to flower. Plants without petals depend on the wind to carry the pollen. The stamens are the males fertilizing organs and the pistil is the female fertilizing organ.The stamen is composed of the filament and anther. The pistil is composed of the ovary‚ style‚ and stigma.
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