POLLINATION EXTRAS Flashcards
Pollination guarantees transfer of right type of pollen
True/false
False
Pollen from the same plant species that land on stigma is always compatible.
True/false
False
“Self-incompatible” pollen exists
Pollen from some other species is always incompatible.
True/false
True
Pistil does not have the ability to recognize right or wrong pollen.
True/false
False
What are the 2 ways in which the pistil rejects wrong pollen?
By preventing pollen germination on stigma or pollen tube growth in style.
The continuous dialogue between pollen grain and pistil is mediated by __________
Chemical constituents of pollen interacting with those of pistil
In the plants in which pollen grain is shed at 2-celled condition, when does the generative cell divide to form male gametes.
During growth of the pollen tube in stigma
Pollen tube enters ovary through ________ and then enters one of the ________ through _________
Micropyle, synergids, Filiform apparatus
________ guides the entry of pollen tube
Filiform apparatus
Pollen-pistil interaction includes all events from ____________ to _______
Pollen deposition on stigma, pollen tube entry into ovule
Pollen pistil interaction is a dynamic process.
True/false
True
Knowledge of pollen pistil interaction helps plant breeeder to manipulate pollen pistil interaction even in incompatible pollinations to get desired hybrids.
True/false
True
What are the steps to study pollen germination ?
1) dusting pollen from flowers on a glass slide containing a drop of sugar solution (10%)
2) After about 15-30 minutes , observe slide under low power lens of microscope
3)Likely to see pollen tubes coming out of pollen grains
Why is artificial hybridisation performed?
To produce commercially superior varieties.
What is contamination of stigma ?
germination of unwanted pollen
If the male parent bears bisexual flowers, removal of anthers from the flower bud after the anther dehisces using pair of forceps is necessary and this process is called emasculation.
True/false
False
Female, Before
________ is the proceess in which emasculated flowers are covered with a bag of suitable size generally made of ____________ to prevent contamination.
Bagging, butter paper
When the stigma of bagged flower attains ________, mature pollen grains from anthers of male parent are ____ and flowers are then ____ and _ are allowed to develop
receptivity, dusted on the stigma, rebagged, fruits
If female parent produces unisexual flowers, which step is skipped?
Emasculation
In unisexual female parents, how is bagging performed?
Female flower buds are bagged before flowers open.
