Bio 1B Lecture 13

Bio 1B Lecture 13 - Bio1BLecture13:Flowering o...

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Bio 1B Lecture 13: Flowering Vegetative Shoot Apical Meristem Shoot apical meristem is made up of meristematic cells o Indeterminate cells Main function: leaves and bud o However when it undergoes transition to flowering Changes occur Stops producing leaves Meristem enlarges Floral organs are produced Stamens, carpels, ovaries Meristem becomes determined All the meristematic cells are used up Meristem becomes committed to a particular  pathway Slides Vegetative shoot apical meristem Leaves have been taken off here o See the apical dome with its rapidly dividing  cells that don’t have any commitment or  any pathway o Also have leave produced by meristems Beginning of axillary buds associated  with this leaf primordia Meristem that has already become partially committed to  forming flowers Produced the primordia for sepals and petals Bumps will become stamen Some of meristem is left over and hasn’t  completed the transition yet Meristem in which apical meristem is used up Floral organs spread up apical dome and  consume all of the meristematic tissue
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As further in transition to flowering, meristem enlargens  Studies about flowering Two American workers, Garner and Allard o Worked for US department of agriculture lab in Maryland, tried to breed  plants Tobacco plant with large leaves Had big field and planted every springtime, tried to find one  good for tobacco Found that every fall, saw a couple large plants with large  leaves Named them Maryland Mammoth o Wanted to collect seeds from them
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Bio 1B Lecture 13 - Bio1BLecture13:Flowering o...

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