Flower Structure of sorghum

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Floral Sorghum Biology © A.K. Chhabra Sorghum vulgare

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Sorghum Plants with lose inflorescence © A.K. Chhabra

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Sorghum Plants with lose panicle © A.K. Chhabra Height generally varies from 40-600cm. It's stem has 7-18 nodes & internodes.

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Sorghum Plants with compact inflorescence © A.K. Chhabra It releases 25-100 million pollen grain.

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Sorghum Plants with compact panicle © A.K. Chhabra Height generally varies from 40-600cm. It's stem has 7-18 nodes & internodes.

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© A.K. Chhabra Sorghum Panicle enclosed in the flag leaf Flag leaf

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Sorghum Lose panicle inside flag leaf © A.K. Chhabra Flag leaf Main rachis Primary branch The inflorescence is a panicle with a central rachis from which come primary branches. They give rise to secondary & Some times tertiary branches which carry the racemes of spike-lets

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Sorghum Lose panicle © A.K. Chhabra Main rachis Primary branch The inflorescence is a panicle with a central rachis from which come primary branches. They give rise to secondary & Some times tertiary branches which carry the racemes of spike-lets Secondary branches

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Sorghum Compact panicle © A.K. Chhabra The inflorescence is a panicle with a central rachis from which come primary branches. They give rise to secondary & Some times tertiary branches which carry the racemes of spike-lets

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Part of Panicle Spike-lets Close-up View of Panicle

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© A.K. Chhabra Sorghum Part of the panicle Awn Pair of spikelets For further close-up, see the next slide………………… Primary branch Secondary branch

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© A.K. Chhabra Sorghum Part of the panicle Awn Pair of spikelets For further close-up, see the next slide………………… Pedicillate spikelet Sessile spikelet Secondary branch

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Different Views of Spikelets

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© A.K. Chhabra Sorghum Part of the panicle Awn Pair of spikelets For another view see the next slide………………… Pedicillate Spikelet (sterile) Sessile Spikelet (perfect)

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© A.K. Chhabra Sorghum Part of the panicle Awn Pair of spikelets For further close-up, see the next slide………………… Pedicillate Spikelet (sterile) Sessile Spikelet (perfect)

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© A.K. Chhabra Sorghum Awn Pair of spikelets Pedicillate Spikelet (sterile) Sessile Spikelet (perfect) For another view see the next slide…………………

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© A.K. Chhabra Sorghum Awn Pair of spikelets Pedicillate Spikelet (sterile) Sessile Spikelet (perfect) For another view see the next slide…………………

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© A.K. Chhabra Sorghum Awn Terminal spikelets with one sessile and a pair of pedicellate spikelets Pedicillate Spikelet (sterile) Sessile Spikelet (perfect) For another view see the next slide………………… Pedicillate Spikelet (sterile)

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© A.K. Chhabra Sorghum Awn Terminal spikelets with one sessile and a pair of pedicellate spikelets Pedicillate Spikelet (sterile) Sessile Spikelet (perfect) For another view see the next slide………………… Pedicillate Spikelet (sterile) Pedicillate Spikelet (sterile)

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© A.K. Chhabra Sorghum Awn Terminal spikelets with one sessile and a pair of pedicellate spikelets Pedicillate Spikelet (sterile) Sessile Spikelet (perfect) Pedicillate Spikelet (sterile)

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Different Views of Florets

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© A.K. Chhabra Sorghum Open bisexual floret (anthers removed) Glume I Lemma hidden inside glume II bears awn Sessile spikelet Glume II Bifid feathery stigma Palea Two styles (bifurcated) For another view see the next slide………………… Perfect flower consist of two glumes one hairy lemma, a small palea, small awn, 3 stamens two lodicules & one pistil.

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© A.K. Chhabra Sorghum Open bisexual floret (anthers intact) Glume I Lemma hidden inside glume II bears awn Sessile spikelet Glume II Bifid feathery stigma anther Awn Perfect flower consist of two glumes one hairy lemma, a small palea, small awn, 3 stamens two lodicules & one pistil. Ovary has two styles with feathery stigmas

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Sorghum Compact panicle At anthesis © A.K. Chhabra Extruding anthers Direction of flowering For another Close view see the next slide…………………

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Sorghum Anthesis © A.K. Chhabra Extruding anthers Extruding stigma For another view see the next slide…………………

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For another view see the next slide………………… Sorghum Anthesis © A.K. Chhabra Extruding anthers Extruding stigma Glume Awn Lemma tip Part of Panicle

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Sorghum Anthesis © A.K. Chhabra Extruding anthers Extruding stigma For another view see the next slide………………… Glume Awn Lemma tip Part of Panicle

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For another view see the next slide………………… Sorghum Anthesis © A.K. Chhabra Extruding anthers Extruding stigma Awn Glume Awn Lemma tip Part of Panicle

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Sorghum Anthesis © A.K. Chhabra Extruding anthers Extruding stigma For another view see the next slide………………… Glume Awn Lemma tip Part of Panicle

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Sorghum Spike-lets arrangement on inflorescence Secondary branch Tertiary branch Fertile sessile spikelet Sterile Pedicellate spikelet Awns Part of Panicle

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Sorghum Anthesis © A.K. Chhabra Extruding anthers Extruding stigma Awn For another view see the next slide………………… Part of Panicle

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Sorghum Anthesis © A.K. Chhabra Extruding anthers Extruding stigma Awn For another view see the next slide………………… Part of Panicle

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Sorghum Glume © A.K. Chhabra

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Sorghum Sterile spikelet / floret (closed) © A.K. Chhabra

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Sorghum Lemma with awn © A.K. Chhabra Lemma Awn For another view see the next slide…………………

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Sorghum Lemma with awn © A.K. Chhabra Lemma Awn

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Sorghum Palea © A.K. Chhabra Palea For another view see the next slide…………………

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Sorghum Anther © A.K. Chhabra

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For another view see the next slide………………… Sorghum Gynoecium © A.K. Chhabra Ovary Style Style Hairy stigma

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For another view see the next slide………………… For another view see the next slide………………… Sorghum Gynoecium © A.K. Chhabra Ovary Style Style Hairy stigma

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For another view see the next slide………………… For another view see the next slide………………… Sorghum Gynoecium CLOSEUP © A.K. Chhabra Ovary Style Style Hairy stigma

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For another view see the next slide………………… Sorghum Gynoecium © A.K. Chhabra Ovary Style Style Hairy stigma CLOSEUP 2

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Sorghum Ovary and anthers © A.K. Chhabra Ovary Filament anther Hairy stigma removed

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Controlled Pollination In Sorghum