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Lecture 8

Lecture 8 - Plants.pdf

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Christoph Richter

Lecture 8 - Plants Thursday, 30 January, 2014 12:08 PM Today's Topics: Announcements: Homework:  Land plant reproduction  Bio seminar - Patrick Lab 3 Gunning Midterm 1 on Tuesday  Plant life cycles Assignment 2 Lecture Topic: Term test  Do all assigned readings (don't need to know the major groups of bacteria and archaea  End-of-chapter questions and boxes  Don’t need to know specific species Land plants had to adjust to reproduction on land  Plants have an alternation of generations that switches between diploid and haploid (but both are multicellular)  In water, spores are easily spread by water ○ The sporophyte just has to release the spores and allow them to spread  Bryophytesstill require water even though they are land plants ○ Without water, the sperm cannot leave and achieve fertilization  Stoneworts:one of the oldest ancestors of land plants ○ Has a haploid and diploid phase ○ Life cycle contains two new qualities:  Female and male gametesin structures specific to those sexes  Typically in protists, when two gametes fertilize each other, the zygote is released but in stoneworts,it does not separate from the parent plant □ Fertilizaton happens towards the end of the summerand the parent plant dies □ In spring, the zygote starts meiosis and produces spores  Traits which aid land plant reproduction: ○ Specialized reproductive organs ex: Gametangia (the structures for produces gametes)have two types:  Antheridia in the male liverwortproduces sperm  Archegonia in the female liverwortproduces eggs  Gametesare protectedby gametangia ○ They nourish their offspring  The zygote grows as an embryo inside the parental plant  The parental tissue gives nutrients to the embryo through transfer cells  All land plants carry out alternation of generations ○ The process:  Spores form through meiosis  Gametophytesare produced by mitosis from the spores  Mitosis produces th
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