1 / 18

Plant Science CSES 1203 Dr. Skulman

Plant Science CSES 1203 Dr. Skulman . Week I Seed Germination. Seed Germination. Is germination the beginning of a plant’s life cycle or the end or is it both beginning and end? Annual seed bearing plants do the following things according to the calendar:

tariq
Download Presentation

Plant Science CSES 1203 Dr. Skulman

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Plant ScienceCSES 1203Dr. Skulman Week I Seed Germination

  2. Seed Germination • Is germination the beginning of a plant’s life cycle or the end or is it both beginning and end? • Annual seed bearing plants do the following things according to the calendar: • Spring-seed is planted, germination follows, • Summer-plants grow, flower, and form seed, • Fall-seed ripens, is harvested or falls from plant, • Winter-seed is dormant or in storage, • Spring-seed is planted, yearly cycle is complete.

  3. Taxonomy Kingdom-All plants (500,000 species) Division-Seed producers (spermatophyta), and non-seed producers Classes : * gymnosperm (naked seed) * angiosperm (seed produced in an ovary) normal flower. We will examine angiosperm germination

  4. Monocot (hypogeal) germination

  5. Dicot (epigeal) germination

  6. Requirements for germination • Proper temperature, varies by species • Water • Oxygen • Light (not for all species, some grasses)

  7. Seed dormancy • Resting period for seed between harvest and planting • Can last from several weeks to many years • Dormancy delays germination until conditions become favorable • Soybeans in Arkansas • Harvested in Fall (followed by winter-unfavorable) • Planted in Spring (conditions now favorable)

  8. Role of water in germination • Water absorbed by seed from soil • Water causes seed to swell • Releases hormones in seed • Hormones stimulate enzymes to break down stored starch to glucose (C6H1206) • Glucose is a simple plant sugar that is used to provide energy for germination

  9. Roles of Temperature and Oxygen in Germination • Oxygen- all living cells require oxygen for respiration; plant cells of root, stem and leaves are actively growing • Temperature- physiological reactions within plants are influenced by temperature; too high or too low stops reactions in plants

  10. Moncots and dicots • Dicots: • Examples, oak trees, beans, clover, shrubs • Leaves have netted venation • Taproot system • Monocots: • Examples-corn, grass, wheat, rice, cattails • Long, slender leaves with parallel veins • Fibrous root system

  11. Other comparisons between monocot and dicot plants Monocot Leaves Dicot Leaves

  12. Class Seed Germination Discussion Questions: • As a farmer, why would you want seed to germinate all at the same time? • Why do farmers/gardeners till their land before planting seed? • In the spring some farmers will apply herbicides to the soil for weed control. • Why would extended herbicidal activity be an advantage?

  13. What foods are derived from germinated seed? 1. Sprouts such as Mung bean or “alfalfa” sprouts

  14. 2. Barley grain is used to make beer and wiskey. However, the grain cannot be used directly, but must first be modified. What is this “modification”? Malting – a process where the grain is initially germinated and then oven dried to different stages of color.

  15. The End

  16. Monocot (hypogeal) germination

More Related