pollination🥂💦💃🏽 Flashcards
autogamy
is rather rare
continuallly results in inbred depression
pollen g transfered from same flower
geitnogamy
two flowers of same plant
xeogamy
to a diff palnt
real / true
monocieois plant
male femae flowers on same plant are unisex
prevents autogamy not geitnogamy
eg- castor
cucurbitis
coconut
maize
`dioecious plants
male female on diff plant are unisex
prvents both autogamy and geitnogamy
eg- papaya
date palm
CONTRIVANCES/ ADAPTATIONS FOR SELF POLL.
monocliny= bixexuality
homocliny
cleisogamy
bud germination
CONTRIVANCES/ ADAPTATIONS FOR cross poll.
dicliny dichogamy- protoandry, protogamy chasmogamy heterostyly self sterrility / self incompability
monocliny- bisex
hrmaphrodite
eg- pea
homogamy
synchrony in pollen and stigma receptivvity
increases chances for self pollination
eg- pea
cleistogamy
in such flowers stigma and anther lie close to each other
they are invariably autogamous, as theres no chance of cross pollen landing
they never open thru their life
produce assured seed set even in absence of pollinators
eg- viola[ commmon pansy ] , oxalis , commenlina
chasmogamous flowers
exposed anters and stigma
dicliny- unisex
a device to prevent self pollination is to have unisex flowers
eg- date palm, papaya
dichogamy- stigma and anther do not mature at the same time
pollen release and stigam receptivity arent sync
- protoandry= salvia , sunfloweer
- protogamy= ficus sps [ banyan, peepeal, fig ]
chasmogamy
exposed anthers and stigam
heterostyly
anther and stigma are placed in different positions so that the pollen can not come in contact with stigma flower
self sterility / self incompatibily
this is a genetic mech., prevents self pollination, by inhibiting pollen germination or pollen tube growth in pistil
anemophily- wind
enormous pollen grain
small, light weight , dry
sigma is often hairy/ feathery to rap pollen g easily and
mucilaginous
well exposed stamen
neither fragrant or attractive
do not have necter g
anemophly-
max loss of pollen g in this, completely non directional
more common among pollinators
wind pis common in grasses
wind pollinate flowers often have - single ovule in each ovary n numerous flowers are packed into an inflorescence
eg- corn cob
tassels is styles and stigmas which wave in the wind to trap pollen g
eg- gymnosperms, maize [ corn ] , sugarcame , bamboo , cannabis , grasses , date palms , papaya
HYDROPHILY-
not all aquatic plants use water for pollination.
it is quite rare in flowering pants in only 30 generas mostly monocots
in most water pollinated species the pollen g is protected from wetinfg by mucilaginoius covering
two types- epihydrophily
- eg: valliseneria is dioecious [ unisex ] and flowers are unisex
- pedical [stalk] of female are long and coiled eventually they reach the water
- the male flowers are released on the surface od f water surface to bursting in inflorescence of male
- passively carried by water to female stigma
- hypohydrophily
-eg-: hydrilla sea grass[ sea grasses]
-in zostera female reamin submerged in water
- and the long riibbon like pollen g are relesed in water and some resch stigma
-F.W= valliseneria, hydrilla
-marine- zostera
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