logging in or signing up Flower structure of onion chhabra61 Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: Embed: Flash iPad Copy Does not support media & animations WordPress Embed Customize Embed URL: Copy Thumbnail: Copy The presentation is successfully added In Your Favorites. Views: 599 Category: Education License: All Rights Reserved Like it (3) Dislike it (0) Added: September 19, 2010 This Presentation is Public Favorites: 2 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript Slide 1: FLORAL BIOLOGY OF ONION (Allium cepa L.) 2N=2X=16 Slide 2: Field View Seed Production Plot: Inflorescence (umbel) is present at the top of the green stem which is hollow from inside. The height may vary from 0.9m-1.2m depending upon genotype and other factors. Slide 3: Flowers in the umbel are enclosed in a membranous sheath called spathe. Inflorescence Membranous sheath Slide 4: The sheath is white-creamish in color. These are 2-3 in number. Inflorescence Close-up Membranous sheath Slide 5: The sheath splits because of the pressure created by growing flowers inside the umbel. Inflorescence Membranous sheath Flowers Slide 6: The sheath splits because of the pressure created by growing flowers inside the umbel. Inflorescence Close-up Membranous sheath: splitting Flowers Slide 7: There may be 50-2000 florets in an inflorescence. This depends upon genotype, time of planting and size and storage conditions of the mother bulb Inflorescence Close-up Membranous sheath Slide 8: Florets Close-up Perianth Slide 9: Florets Close-up 2 Perianth Slide 10: Florets Close-up Perianth Single floret Slide 11: Florets Close-up Single floret Slide 12: Florets Close-up Single floret Slide 13: Inflorescence Flowers are protandrous, so the crop is cross pollinated. The umbels are aggregates of cymes of 5-10 flowers each and the flowers open in a definite sequence. Anthers Slide 14: Anthesis Slide 15: Inflorescence Close-up The flowers are white to bluish in color. The perianth segments are 6 in 2 whorls spreading, reflexed, free and ovate. The stamens are also six in two whorls. Anthers (outer) Ovary Anthers (inner) Slide 16: Inflorescence Close-up Anthers are bi-locular and the ovary is superior. Stigma Slide 17: Floret TOP VIEW Anthers (outer) Ovary Anthers (inner) Ovary is superior and anthers are in two whorls, each having three stamens. Slide 18: Floret SIDE VIEW Ovary is superior and anthers are in two whorls, each having three stamens. Anthers (outer) Ovary Anthers (inner) Stigma Slide 19: Floret ANOTHER SIDE VIEW Ovary is superior and anthers are in two whorls, each having three stamens. Anthers (outer) Ovary Anthers (inner) Stigma Slide 20: Gynoecium Ovary Stigma Slide 21: Androecium Anthers may be of purple in color in some of the genotypes or their color changes with age of the flower also. Slide 22: Androecium Purple anthers Slide 23: Androecium Some florets have two ovaries with 7 stamens. Green anthers Two Stigmas Slide 24: Androecium Purple anthers Single Stigma Slide 25: Androecium 7 GREEN ANTHERS PURPLE ANTHERS Slide 26: Membranous Perianth Slide 27: Crop View at Seed Formation Stage Slide 28: Seed Formation Stage Slide 29: Seed Formation Stage Slide 30: Seed Formation Stage Slide 31: Seed Formation Stage Slide 32: Accessory Organs of Flower Slide 33: Seed Slide 34: T.S. Seed Slide 35: Mature Onion You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.