difference between hylum and micropyle
Answers
Answer:
The hilum is a scar on the seed coat, marking the place where the seed was attached to the ovary tissue (via the funiculus). It is controlling the relationships between the external environment and the embryo.
The permeability of the seeds depends on different factors, one of which is the cutin in the hilum region. The hilum is also a potential path for an invasion of pathogens in the seeds.
In the final stages of seeds’ formation, the water content in the seed is controlled by the hilum. It opens in low humidity and closes in high humidity (10% humidity of the seed weight), preventing water absorption. This function of the hilum explains the higher longevity of harder seeds.
Explanation:
The micropyle is a pore in the seed coat of the nucellus. During the fertilization the pollen tube is passing through the micropyle. When the seed starts to germinate, the water enters the seed through the micropyle. The micropyle is also a potential path for an invasion of pathogens in the seeds.
Sometimes the micropyle is naturally closed by a waxy “lid”. This “lid” regulates pathogen susceptibility and water absorption in the seed. Plants with such “lid” have lower infections, compared to those with open micropyle.
Answer:
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