WheatBP

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Development Home Germination Early growth and tillering Stem elongation Wheat apex development Flowering and fertilisation Pollen release Grain growth 1 to 4 days Whole grain photographs Embryo sac: events inside Embryo sac: wall changes Embryo micrographs
Grain growth 4 to 10 days Cell layers inside a grain Grain filling 11 to 16 days Grain filling 17 to 21 days Grain filling 21 to 30 days Development of the embryo Dry down 30 to 40 days How we grew the plants Photography and microscopy
DAYS = days after flowering

Grain growth 1 to 4 days

Whole grain photographs

	Dorsal view of whole grains at 24 and 48 hours after fertilization. The female stigmas have collapsed and the maternal tissue is swelling rapidly.
	Long section of the whole grain 24 hrs after fertilization showing the large central embryo sac within the mother tissue. The embryo cannot be seen with the naked eye. The embryo sac and the mother tissues are expanding rapidly to make space for the endosperm.
	Long section of the whole grain at 3 days after fertilization. Further rapid growth of the maternal tissue and the embryo sac inside. The grain growth continues for between fifteen and eighteen days depending on the temperature. During this time the internal structure of the endosperm is created.
	Ventral view of whole grains at 24 and 48 hours after fertilization. The ventral groove is already a prominent feature.
	Long section of the whole grain at 4 days after fertilization. The embryo sac contains a large central liquid-filled vacuole with nuclei dividing freely in the peripheral cytoplasm. This vacuole will be filled with storage reserves of starch and protein during the grain filling stages. The first endosperm cells have no cell walls and are free to move around within the embryo sac.

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