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Reproduction week 3

by: Madilynn_Danielle

Reproduction week 3 BTNY 11000 - 010

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About this Document

covers how plants reproduce
Introduction To Plant Science
Peter B Goldsbrough,Robert E Pruitt
Class Notes
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This 3 page Class Notes was uploaded by Madilynn_Danielle on Monday September 12, 2016. The Class Notes belongs to BTNY 11000 - 010 at Purdue University taught by Peter B Goldsbrough,Robert E Pruitt in Fall 2016. Since its upload, it has received 4 views.

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Date Created: 09/12/16
Botany Week 3: Reproduction  Tubes arise at the end of the stolons and have no leaves associated with them  Bulbs are buds comprised of a short stem with numerous modified leaves attached to it  Reproductive Strategies o Offspring are clones of the plant o Requires less investment and less risk  Sexual Repo o Offspring are genetically variable o Is always expensive and can be risky  Asexual Repo o A very efficient strategy for colonizing a new area – many weeds and other pioneer use asexual o Different forms of asexual repo are possible o New plants can grow as off shoots from various structures – most often from modified stems o Some plants can produce small plantlets along the margins of leaves o Seeds can produce without pollination or fertilization apomixes o Asexually derived seeds survive in the soil and germinate the same way as sexually derived seeds but they are all clones of the parent o Seeds can also be produced by self-pollination  Sexual Repo o *Genetic variability*: is what allows organisms to adapt to their environment and evolve new capabilities o Central to plant sexual repo is the concept of alternation of generations o Sexual repo is not only performed by plants with flowers o Different organisms adapt to different life styles o The haploid and diploid parts of the life cycle alternate o Sometimes the diploid organisms dominate o Sometimes the haploid organisms dominate o In plants both parts of the life cycle are composed of multicellular organisms  Why Have Sex? o Sex is all about producing arrange of offspring with different genetic possibilities o In a completely stable environment clonal repo is a good strategy o When resources need to be exploited quickly, clonal repo is also a good strategy o When competition for resources exists or the environment is unpredictable, sexual repo is the way  Flowers o Some species are self-incompatible (reject their own pollen)  This can be due to the differences in the morphology or biochemical barriers or both o Most flowers are hermaphrodites (both male and female parts) o Some just have male (staminate) and some just have female (carpellate) o Monoecious - when a species has male and female flowers they may occur on the same plant o Dioecious - when a species has male and female flowers they may occur on separate male and female plants  Getting from the Anther to the Stigma o Wind – the main vector for inconspicuous flowers, flowers with no odor or nectar, and flowers with light pollen. Examples are grasses, olive, walnut, ragweed. Insects – are the main pollination vectors for colorful flowers and flowers with odor and nectar. Many examples. Other vectors include water, birds, bats, and other animals, including humans. Many red flowers are pollinated by birds, such as hummingbirds. Specific pollination vectors can increase the reproductive success of plants - less pollen and female resources are wasted on non- productive events  Events After Pollinating are Controlled by the Female o Pollen germination is frequently controlled through interactions with the stigma - typically restricted to pollen from the right species o Pollen tubes are guided through the female reproductive system to the ovules by signals from the female gametophyte o Release of the sperm cells into the female gametophyte also requires signals produced by the female gametophyte o For it to be successful the male need to listen to the female


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