What are the physiological changes during seed germination?

Due to imbibition of water the seed coat becomes more permeable to O2 and water and less resistant to outward growth of embryo. After imbibition, the inner contents of the seed increase in volume, thereby exerting pressure on the seed coat leading to rupture of the seed coat. The plumule and radical emerge thereafter.

What is physiology of seed development?

The seed development process, from ovule fertilization to physiological maturity, can be divided into four phases according to http://agritech.tnau.ac.in/seed/seedconcepts.html. Phases I and II comprise cell division and expansion. Reserve accumulation occurs in Phase III as seed dry mass increases.

What are the factors affecting seed storage?

Factors influencing seed storage. Biotic.

What causes deterioration of the seeds when stored at room temperature?

High seed moisture content along with high temperature and ambient oxygen would trigger series of metabolic changes, such as the accumulation of the reactive oxygen species, loss of membrane integrity, increase in respiration and the consumption of storage reserves, and thus lead to seed deterioration (McDonald, 1999; …

What is mobilization of stored product during seed germination?

Germination is shortly followed by the mobilization of food reserves from the seed storage organs or endosperm, providing essential energy to fuel growth until the seedling becomes photoautotrophic.

What changes do seeds and seedlings undergo during germination and early growth?

Such five changes or steps occurring during seed germination are: (1) Imbibition (2) Respiration (3) Effect of Light on Seed Germination(4) Mobilization of Reserves during Seed Germination and Role of Growth Regulators and (5) Development of Embryo Axis into Seedling.

What is physiology simple?

Physiology is the study of how the human body works. It describes the chemistry and physics behind basic body functions, from how molecules behave in cells to how systems of organs work together. It helps us understand what happens in a healthy body in everyday life and what goes wrong when someone gets sick.

What are the different stages of seed storage?

The storage period can thus be effectively divided into stages: • pre-harvest; • harvesting–warehouse; • warehouse; and • warehouse–planting. Following this logical sequence is essential from the outset to ensure that seed of the highest possible initial quality and safe moisture content is placed in warehouse storage.

Which is the most crucial for seed storage?

Low degrees of moisture and temperature are the two most important factors in storage of seeds for food. Both of these factors reduce seed respiration and the growth of pests.

How does storage affect seed viability?

However, seeds age during storage, resulting in decline in quality and ultimately loss of viability if storage conditions are not appropriate (Harrington 1972). Moisture, temperature, and the proportion of oxygen are key environmental factors that affect seed deterioration and loss of viability.

What is seed mobilization?

The mobilization of seed storage proteins upon seed imbibition and germination is a crucial process in the establishment of the seedling. Various means are used in such cases to prevent proteolytic attack until after imbibition of the seed with water.