Lecture 5 Plants in the environment_6-1

Lecture 5 Plants in the environment_6-1 - 1 Read before...

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Unformatted text preview: 1 Read before lecture Attendance at lectures is not compulsory The lecture is available as handouts on d2l. Much other information is in the book If you decide to come to lectures you are committing to the following code of conduct No talking or cell phone use during class No leaving before the end of the lecture. If you come, you commit to stay the whole time Code of conduct for lectures Important information Quizzes There will be a quiz for each lecture The Thursday and following Tuesday quiz are available Tuesday by midnight. You have one week to complete each quiz Note, different office hours this week: Peter Chesson, BioSciences West 218, M 3:00-4:00, No Wednesday office hours. Instead, Friday 11:00- noon. The worlds largest flower The worlds Largest inflorescence Engelmanns prickly pear from Tucson Opener Key Players in Sexual Reproduction Pollen: the male gametophytes in seed plants 2 Pollination Pollen is vectored by wind or by animals Figure 39.4 Pollen Tubes Begin to Grow Figure 39.3 Self-Incompatibility Plant stigmas can exercise mate selection Figure 39.1 Development of Gametophytes and Nuclear Fusion Some basic details of Angiosperm sexual reproduction Megagametophytes (embryo sacs, n) develop in megasporangia (2n) Microgametophytes (pollen grains, n) develop in microsporangia (2n). Figure 39.5 Sperm Nuclei and Double Fertilization Details of fertilization Synergids attract pollen tube. Two sperm cells enter a synergid. One fertilizes the egg. The other unites with the polar nuclei to form the triploid endosperm Hence the term double fertilization Figure 39.6 Early Development of a Eudicot 3 Figure 39.7 Variety in Angiosperm Seeds During seed formation, the endosperm accumulates starch, lipids and proteins from the parent plant . Late in development, the seed becomes desiccated, and the embryo stops developing until germination Figure 39.8 Dispersal of Fruits Fruits develop, assisting in dispersal Figure 39.9 Flowering and the Apical Meristem Flowering may be the terminal stage in a plants life (semelparity, e.g....
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Lecture 5 Plants in the environment_6-1 - 1 Read before...

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