Floral Biology of sunflower

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Presentation Description

Sunflower, flower, emasculation, pollination, stigma, anther, gynoecium, anthesis, androecium, A.K. Chhabra, CCSHAU, Hisar, Haryana, India, Ashok Chhabra, Electronic manual, floral biology, helianthus

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By: amulya237 (23 month(s) ago)

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By: ramachandragiri (23 month(s) ago)

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By: megirish (29 month(s) ago)

hello sir, I am an M.Sc student, my research is on Sunflower crop and your ppt on floral biology on sunflower is very informative, so kindly send it to my mail ID- me.kl1202@gmail.com, I hope you will do so, thanking you.

By: mkramyasri (35 month(s) ago)

Dear Sir/Mam, I m a Ph.D. Scholar, working in sunflower pollinators. Your ppt is too good and it will be very use full for my work. Kindly send it to my email ID - mkramyasri@yahoo.com -Regards, Ramya

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Presentation Transcript

Slide 1: 

UNFLOWER Floral Biology S

Slide 2: 

UNFLOWER Floral Biology S

Slide 3: 

A Crop of Sunflower at Full Bloom (Helianthus annus) Inflorescence is heliotropic UNFLOWER S Floral Biology © A.K. Chhabra

Slide 7: 

Head is attached to main stem at varying angles. Involucral bracts (phyllaries) which vary in size and shape surround the head Involucral bracts (phyllaries) UNFLOWER S Floral Biology © A.K. Chhabra

Slide 8: 

Involucral bracts (phyllaries) Ray florets (folded) Ray florets are uncoiled from the centre first Capitulum UNFLOWER S Floral Biology © A.K. Chhabra

Slide 9: 

Ray florets almost opened uncovering the disc florets Ray florets (folded) Disc florets The inner disc florets, which are hermaphrodite and fertile, are arranged in arcs radiating from the centre of the head. UNFLOWER S Floral Biology © A.K. Chhabra

Slide 10: 

Completely opened ray florets Disc florets UNFLOWER S Floral Biology © A.K. Chhabra

Slide 11: 

Click on this flower to See various stages of anthesis UNFLOWER S Floral Biology © A.K. Chhabra

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1 2 3 4 5 6 Progressive stages of anthesis (Disc florets) The outer whorl of disc flowers open first proceeding gradually towards the centre of the head. In general, 2 to 4 whorls open daily and complete flowering occurs within a head in 5-8 days UNFLOWER S Floral Biology © A.K. Chhabra

Slide 13: 

Side view of capitulum Disc florets Ray florets Tubular sepals UNFLOWER S Floral Biology © A.K. Chhabra

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Different Stages of Disc Floret Development Sepals free at the top Sepals fused to form a tubular structure Pappus (scales) Modified petals seed (achene) Ovary UNFLOWER S Floral Biology © A.K. Chhabra

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Cluster of Disc florets Tubular sepals Sepals free at the top Towards centre of capitulum Towards Periphery of capitulum Progressive Stages of Stigma emergence UNFLOWER S Floral Biology © A.K. Chhabra

Slide 16: 

Disc Floret Showing Receptive Bi-fid Stigma Each disc floret consists of inferior ovary, two pappus scales (modified sepals) and a tubular corolla formed by the fusion of five petals, except at the tip. Five anthers are united to form a tube with separate filaments attached to the base of corolla tube. Inside the anther tube is the style, terminating in a divided stigma. When the flower is fully developed, the style is elongated and the bifid stigma curls outward. bifid stigma curls outward corolla tube anthers are united ovary Pappus (second is broken) Close view on next slide UNFLOWER S Floral Biology © A.K. Chhabra

Slide 17: 

bifid stigma curls outward corolla tube 5 anthers are united Close-up of top portion of Disc Floret UNFLOWER S Floral Biology © A.K. Chhabra

Slide 18: 

Tubular sepals Sepals free at the top Pappus Pappus achne achne Attachment of pappus even at physiological maturity of seed (achne) UNFLOWER S Floral Biology © A.K. Chhabra

Slide 19: 

Developmental Stages of Disc Florets 1 2 3 4 5 6 7 8 9 10 UNFLOWER S Floral Biology © A.K. Chhabra

Slide 20: 

Various Parts of Disc Floret Unfolded tubular corolla Stigma Anthers forming A tubular structure Corolla Removed Stigma Stigma Anthers forming A tubular structure Stigma UNFLOWER S Floral Biology © A.K. Chhabra

Slide 21: 

Anthers forming A tubular structure Anthers detached from the anther tube 1 2 3 4 5 Androecium showing tubular structure of anthers and 5 individual anthers UNFLOWER S Floral Biology © A.K. Chhabra

Slide 22: 

Ray Florets Bracts Peduncle Back view of sunflower capitulum UNFLOWER S Floral Biology © A.K. Chhabra

Slide 23: 

Ray Florets Hairy Bracts Peduncle Back view of sunflower capitulum UNFLOWER S Floral Biology © A.K. Chhabra

Slide 24: 

Ray Florets Bracts Hairy Peduncle Back view of sunflower capitulum UNFLOWER S Floral Biology © A.K. Chhabra

Slide 25: 

Ray Florets Bracts with hairy margins Side view of sunflower bracts UNFLOWER S Floral Biology © A.K. Chhabra

Slide 26: 

Mature Capitulum Mature seeds Ready to harvest Bracts UNFLOWER S Floral Biology © A.K. Chhabra

Slide 27: 

Achne Mature Seeds UNFLOWER S Floral Biology © A.K. Chhabra

Slide 28: 

Disc florets Ray florets Tubular sepals Close-up UNFLOWER S Floral Biology © A.K. Chhabra

Slide 29: 

A-line showing no pollen production

Slide 30: 

B-line

Slide 31: 

Collection of pollen from B-line

Slide 32: 

Dusting B-pollen on A-line head Maintenance of A-line

Slide 33: 

Head of R-line showing abundance of pollen grains

Slide 34: 

Multi shoot Plant of Restorer line in Sunflower

Slide 35: 

Bagging (Selfing or sib mating) in Sunflower

Slide 36: 

A Few CLOSE-UP Views ... Label them UNFLOWER S Floral Biology © A.K. Chhabra

Slide 37: 

Close-up

Slide 38: 

Close-up

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Close-up

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Close-up

Slide 41: 

Close-up

Slide 42: 

Close-up

Slide 43: 

Close-up

Slide 44: 

Close-up

Slide 45: 

UNFLOWER S Floral Biology © A.K. Chhabra Close-up

Slide 46: 

Close-up

Slide 47: 

Close-up

Slide 48: 

UNFLOWER S Floral Biology © A.K. Chhabra Close-up

Slide 58: 

Floral Biology of Crop Plants: Sunflower (c) A.K. Chhabra © A.K. Chhabra 2002 Click here to end the show