{"id":{"repo_id":"greece","oai_identifier":"oai:10442/0289"},"canonical_url":"https://search.dev.ndltd.org/etd/greece/oai:10442/0289","repository":{"repo_id":"greece","name":"Greek National Archive of PhD Theses","base_url":"https://phdtheses.ekt.gr/eadd_oai/request"},"display":{"title":"ΜΕΛΕΤΗ ΤΟΥ ΦΛΟΙΩΜΑΤΟΣ ΣΤΟ ΑΓΡΩΣΤΩΔΕΣ ΦΥΤΟ AEGILOPS COMOSA VAR THESSALICA ΣΕ ΕΠΙΠΕΔΟ ΟΠΤΙΚΗΣ ΚΑΙ ΗΛΕΚΤΡΟΝΙΚΗΣ ΜΙΚΡΟΣΚΟΠΙΑΣ","abstract":"THE ONTOGENY AND DIFFERENTATION OF PHLOEM OF THE GRASS AEGILOPS COMOSA VAR. THESSALICA HAS BEEN STUDIED BY MEANS OF LIGHT AND ELECTRON MICROSCOPY. IT WAS FOUND THAT THIS GRASS BELONGS TO THE C3 PHOTOSYNTHETIC TYPE. THE PROTOPHLOEM SIEVE ELEMENTS IN THE LEAF AND THE STEM DIFFERENTIATE EARLIER THAN THOSE OF METAPHLOEM, BUT SOON AFTER THEIR MATURATION THEY OBLITERATE. IN THE ROOT, HOWEVER, PROTOPHLOEM SIEVE ELEMENTS DO NOT OBLITERATE, AND THIS IS ATTRIBUTABLE TO THEPRESENCE OF COMPANION CELLS. IN ROOTS IN PARTICULAR THE ONTOGENY OF PROTOPHLOEM VIA SUCCESSIVE ASYMMETRICAL CELL DIVISIONS WAS STUDIED, IN WHICH MICROTUBULES PLAY A SIGNIFICANT ROLE. PLASTIDS DEVELOP CUNEATE CRYSTALLOID INCLUSIONS OFPROTEINASES COMPOSITION AND PROVIDE THE INITIAL INDICATION OF DIFFERENTIATIONONSET. MATURE SIEVE ELEMENTS ARE DEVOID OF FUNCTIONAL NUCLEUS, ORGANIZED CYTOPLASM, RIBOSOMES, DICTYOSOMES, MICROTUBULES AND VACUOLES.","abstract_html":"THE ONTOGENY AND DIFFERENTATION OF PHLOEM OF THE GRASS AEGILOPS COMOSA VAR. THESSALICA HAS BEEN STUDIED BY MEANS OF LIGHT AND ELECTRON MICROSCOPY. IT WAS FOUND THAT THIS GRASS BELONGS TO THE C3 PHOTOSYNTHETIC TYPE. THE PROTOPHLOEM SIEVE ELEMENTS IN THE LEAF AND THE STEM DIFFERENTIATE EARLIER THAN THOSE OF METAPHLOEM, BUT SOON AFTER THEIR MATURATION THEY OBLITERATE. IN THE ROOT, HOWEVER, PROTOPHLOEM SIEVE ELEMENTS DO NOT OBLITERATE, AND THIS IS ATTRIBUTABLE TO THEPRESENCE OF COMPANION CELLS. IN ROOTS IN PARTICULAR THE ONTOGENY OF PROTOPHLOEM VIA SUCCESSIVE ASYMMETRICAL CELL DIVISIONS WAS STUDIED, IN WHICH MICROTUBULES PLAY A SIGNIFICANT ROLE. PLASTIDS DEVELOP CUNEATE CRYSTALLOID INCLUSIONS OFPROTEINASES COMPOSITION AND PROVIDE THE INITIAL INDICATION OF DIFFERENTIATIONONSET. MATURE SIEVE ELEMENTS ARE DEVOID OF FUNCTIONAL NUCLEUS, ORGANIZED CYTOPLASM, RIBOSOMES, DICTYOSOMES, MICROTUBULES AND VACUOLES.","abstract_has_math":false,"creators":["Eleutheriou, Eleftherios","Ελευθερίου, Ελευθέριος"],"institution":"Aristotle University Of Thessaloniki (AUTH)","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":1981,"date_issued":"1981","date_published":"1981","updated_at":"2026-07-24T02:25:11Z","subjects":["Βοτανική","Διαφοροποίηση","Μικροσωληνίσκοι","Οντογένεση","ΟΠΤΙΚΗ ΚΑΙ ΗΛΕΚΤΡΟΝΙΚΗ ΜΙΚΡΟΣΚΟΠΙΑ","ΣΥΓΚΡΙΤΙΚΗ ΑΝΑΤΟΜΙΑ","ΦΛΟΙΩΜΑ","Ωρίμανση","Aegilops","COMPARATIVE ANATOMY","Differentiation","LIGHT AND ELECTRON MICROSCOPY","Microtubules","Ontogeny","Phloem","SIEVE ELEMENTS","STRUCTUREAT MATURITY","Γεωπονικές Επιστήμες και Κτηνιατρική","Γεωπονία, Δασολογία και Αλιεία","Agricultural and Veterinary Sciences","Agriculture, Forestry and Fisheries"],"languages":["gre"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["10.12681/eadd/0289"],"render_values":[{"text":"10.12681/eadd/0289","href":"https://doi.org/10.12681/eadd/0289","code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/10442/hedi/0289","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Eleutheriou, Eleftherios","Ελευθερίου, Ελευθέριος"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["1981"]},{"key":"dc:publisher","label":"Institution","values":["Aristotle University Of Thessaloniki (AUTH)","Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ)"]},{"key":"dc:type","label":"Dc Type","values":["PhD Thesis"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Βοτανική","Διαφοροποίηση","Μικροσωληνίσκοι","Οντογένεση","ΟΠΤΙΚΗ ΚΑΙ ΗΛΕΚΤΡΟΝΙΚΗ ΜΙΚΡΟΣΚΟΠΙΑ","ΣΥΓΚΡΙΤΙΚΗ ΑΝΑΤΟΜΙΑ","ΦΛΟΙΩΜΑ","Ωρίμανση","Aegilops","COMPARATIVE ANATOMY","Differentiation","LIGHT AND ELECTRON MICROSCOPY","Microtubules","Ontogeny","Phloem","SIEVE ELEMENTS","STRUCTUREAT MATURITY","Γεωπονικές Επιστήμες και Κτηνιατρική","Γεωπονία, Δασολογία και Αλιεία","Agricultural and Veterinary Sciences","Agriculture, Forestry and Fisheries"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["gre"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["10.12681/eadd/0289","http://hdl.handle.net/10442/hedi/0289"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["THE ONTOGENY AND DIFFERENTATION OF PHLOEM OF THE GRASS AEGILOPS COMOSA VAR. THESSALICA HAS BEEN STUDIED BY MEANS OF LIGHT AND ELECTRON MICROSCOPY. IT WAS FOUND THAT THIS GRASS BELONGS TO THE C3 PHOTOSYNTHETIC TYPE. THE PROTOPHLOEM SIEVE ELEMENTS IN THE LEAF AND THE STEM DIFFERENTIATE EARLIER THAN THOSE OF METAPHLOEM, BUT SOON AFTER THEIR MATURATION THEY OBLITERATE. IN THE ROOT, HOWEVER, PROTOPHLOEM SIEVE ELEMENTS DO NOT OBLITERATE, AND THIS IS ATTRIBUTABLE TO THEPRESENCE OF COMPANION CELLS. IN ROOTS IN PARTICULAR THE ONTOGENY OF PROTOPHLOEM VIA SUCCESSIVE ASYMMETRICAL CELL DIVISIONS WAS STUDIED, IN WHICH MICROTUBULES PLAY A SIGNIFICANT ROLE. PLASTIDS DEVELOP CUNEATE CRYSTALLOID INCLUSIONS OFPROTEINASES COMPOSITION AND PROVIDE THE INITIAL INDICATION OF DIFFERENTIATIONONSET. MATURE SIEVE ELEMENTS ARE DEVOID OF FUNCTIONAL NUCLEUS, ORGANIZED CYTOPLASM, RIBOSOMES, DICTYOSOMES, MICROTUBULES AND VACUOLES.","Η ΟΝΤΟΓΕΝΕΣΗ ΚΑΙ Η ΔΙΑΦΟΡΟΠΟΙΗΣΗ ΤΟΥ ΦΛΟΙΩΜΑΤΟΣ ΣΤΟ ΑΓΡΩΣΤΩΔΕΣ ΦΥΤΟ AEGILOPS COMOSA VAR. THESSALICA ΜΕΛΕΤΗΘΗΚΕ ΜΕ ΤΟ ΟΠΤΙΚΟ ΚΑΙ ΗΛΕΚΤΡΟΝΙΚΟ ΜΙΚΡΟΣΚΟΠΙΟ. ΒΡΕΘΗΚΕ ΟΤΙ ΤΟ ΦΥΤΟ ΑΥΤΟ ΑΝΗΚΕΙ ΣΤΑ C3 ΦΩΤΟΣΥΝΘΕΤΙΚΑ ΕΙΔΗ. ΣΤΑ ΦΥΛΛΑ ΚΑΙ ΤΟ ΒΛΑΣΤΟ ΤΑ ΗΘΜΟΣΤΟΙΧΕΙΑ ΠΡΩΤΟΦΛΟΙΩΜΑΤΟΣ ΔΙΑΦΟΡΟΠΟΙΟΥΝΤΑΙ ΝΩΡΙΤΕΡΑ ΠΑΡΑ ΤΟΥ ΜΕΤΑΦΛΟΙΩΜΑΤΟΣ, ΑΛΛΑ ΣΥΝΤΟΜΑ ΜΕΤΑ ΤΗΝ ΩΡΙΜΑΝΣΗ ΤΟΥΣ ΚΑΤΑΣΤΡΕΦΟΝΤΑΙ. ΑΝΤΙΘΕΤΑ ΣΤΗ ΡΙΖΑ ΤΑ ΗΘΜΟΣΤΟΙΧΕΙΑ ΠΡΩΤΟΦΛΟΙΩΜΑΤΟΣ ΔΕΝ ΚΑΤΑΣΤΡΕΦΟΝΤΑΙ, ΠΡΑΓΜΑ ΠΟΥ ΑΠΟΔΙΔΕΤΑΙ ΣΤΗΝΥΠΑΡΞΗ ΣΥΝΟΔΩΝ ΚΥΤΤΑΡΩΝ. ΙΔΙΑΙΤΕΡΑ ΣΤΗ ΡΙΖΑ ΜΕΛΕΤΗΘΗΚΕ Η ΟΝΤΟΓΕΝΕΣΗ ΤΟΥ ΠΡΩΤΟΦΛΟΙΩΜΑΤΟΣ ΜΕΣΑ ΑΠΟ ΔΙΑΔΟΧΙΚΕΣ ΑΣΥΜΜΕΤΡΕΣ ΚΥΤΤΑΡΟΔΙΑΙΡΕΣΕΙΣ, ΣΤΙΣ ΟΠΟΙΕΣ ΟΙ ΜΙΚΡΟΣΩΛΗΝΙΣΚΟΙ ΔΙΑΔΡΑΜΑΤΙΖΑΝ ΣΗΜΑΝΤΙΚΟ ΡΟΛΟ. ΤΑ ΠΛΑΣΤΙΔΙΑ ΑΝΑΠΤΥΣΣΟΥΝ ΣΦΗΝΟΕΙΔΗΚΡΥΣΤΑΛΛΟΕΙΔΗ ΕΓΚΛΕΙΣΤΑ ΠΡΩΤΕΙΝΙΚΗΣ ΦΥΣΗΣ ΚΑΙ ΑΠΟΤΕΛΟΥΝ ΤΗΝ ΠΡΩΤΗ ΕΝΔΕΙΞΗ ΕΝΑΡΞΗΣ ΔΙΑΦΟΡΟΠΟΙΗΣΗΣ. ΤΑ ΩΡΙΜΑ ΗΘΜΟΣΤΟΙΧΕΙΑ ΣΤΕΡΟΥΝΤΑΙ ΛΕΙΤΟΥΡΓΙΚΟΥ ΠΥΡΗΝΑ, ΟΡΓΑΝΩΜΕΝΟΥ ΚΥΤΟΠΛΑΣΜΑΤΟΣ, ΡΙΒΟΣΩΜΑΤΩΝ, ΔΙΚΤΥΟΣΩΜΑΤΩΝ, ΜΙΚΡΟΣΩΛΗΝΙΣΚΟΥ ΚΑΙ ΧΥΜΟΤΟΠΙΩΝ."]},{"key":"dc:title","label":"Title","values":["ΜΕΛΕΤΗ ΤΟΥ ΦΛΟΙΩΜΑΤΟΣ ΣΤΟ ΑΓΡΩΣΤΩΔΕΣ ΦΥΤΟ AEGILOPS COMOSA VAR THESSALICA ΣΕ ΕΠΙΠΕΔΟ ΟΠΤΙΚΗΣ ΚΑΙ ΗΛΕΚΤΡΟΝΙΚΗΣ ΜΙΚΡΟΣΚΟΠΙΑΣ","A LIGHT AND ELECTRON MICROSCOPY STUDY ON PHLOEM DIFFERENTIATION OF THE GRASS AEGILOPS COMOSA VAR THESSALICA"]}]}],"canonical_facts":{"dc:creator":["Eleutheriou, Eleftherios","Ελευθερίου, Ελευθέριος"],"dc:date":["1981"],"dc:description":["THE ONTOGENY AND DIFFERENTATION OF PHLOEM OF THE GRASS AEGILOPS COMOSA VAR. THESSALICA HAS BEEN STUDIED BY MEANS OF LIGHT AND ELECTRON MICROSCOPY. IT WAS FOUND THAT THIS GRASS BELONGS TO THE C3 PHOTOSYNTHETIC TYPE. THE PROTOPHLOEM SIEVE ELEMENTS IN THE LEAF AND THE STEM DIFFERENTIATE EARLIER THAN THOSE OF METAPHLOEM, BUT SOON AFTER THEIR MATURATION THEY OBLITERATE. IN THE ROOT, HOWEVER, PROTOPHLOEM SIEVE ELEMENTS DO NOT OBLITERATE, AND THIS IS ATTRIBUTABLE TO THEPRESENCE OF COMPANION CELLS. IN ROOTS IN PARTICULAR THE ONTOGENY OF PROTOPHLOEM VIA SUCCESSIVE ASYMMETRICAL CELL DIVISIONS WAS STUDIED, IN WHICH MICROTUBULES PLAY A SIGNIFICANT ROLE. PLASTIDS DEVELOP CUNEATE CRYSTALLOID INCLUSIONS OFPROTEINASES COMPOSITION AND PROVIDE THE INITIAL INDICATION OF DIFFERENTIATIONONSET. MATURE SIEVE ELEMENTS ARE DEVOID OF FUNCTIONAL NUCLEUS, ORGANIZED CYTOPLASM, RIBOSOMES, DICTYOSOMES, MICROTUBULES AND VACUOLES.","Η ΟΝΤΟΓΕΝΕΣΗ ΚΑΙ Η ΔΙΑΦΟΡΟΠΟΙΗΣΗ ΤΟΥ ΦΛΟΙΩΜΑΤΟΣ ΣΤΟ ΑΓΡΩΣΤΩΔΕΣ ΦΥΤΟ AEGILOPS COMOSA VAR. THESSALICA ΜΕΛΕΤΗΘΗΚΕ ΜΕ ΤΟ ΟΠΤΙΚΟ ΚΑΙ ΗΛΕΚΤΡΟΝΙΚΟ ΜΙΚΡΟΣΚΟΠΙΟ. ΒΡΕΘΗΚΕ ΟΤΙ ΤΟ ΦΥΤΟ ΑΥΤΟ ΑΝΗΚΕΙ ΣΤΑ C3 ΦΩΤΟΣΥΝΘΕΤΙΚΑ ΕΙΔΗ. ΣΤΑ ΦΥΛΛΑ ΚΑΙ ΤΟ ΒΛΑΣΤΟ ΤΑ ΗΘΜΟΣΤΟΙΧΕΙΑ ΠΡΩΤΟΦΛΟΙΩΜΑΤΟΣ ΔΙΑΦΟΡΟΠΟΙΟΥΝΤΑΙ ΝΩΡΙΤΕΡΑ ΠΑΡΑ ΤΟΥ ΜΕΤΑΦΛΟΙΩΜΑΤΟΣ, ΑΛΛΑ ΣΥΝΤΟΜΑ ΜΕΤΑ ΤΗΝ ΩΡΙΜΑΝΣΗ ΤΟΥΣ ΚΑΤΑΣΤΡΕΦΟΝΤΑΙ. ΑΝΤΙΘΕΤΑ ΣΤΗ ΡΙΖΑ ΤΑ ΗΘΜΟΣΤΟΙΧΕΙΑ ΠΡΩΤΟΦΛΟΙΩΜΑΤΟΣ ΔΕΝ ΚΑΤΑΣΤΡΕΦΟΝΤΑΙ, ΠΡΑΓΜΑ ΠΟΥ ΑΠΟΔΙΔΕΤΑΙ ΣΤΗΝΥΠΑΡΞΗ ΣΥΝΟΔΩΝ ΚΥΤΤΑΡΩΝ. ΙΔΙΑΙΤΕΡΑ ΣΤΗ ΡΙΖΑ ΜΕΛΕΤΗΘΗΚΕ Η ΟΝΤΟΓΕΝΕΣΗ ΤΟΥ ΠΡΩΤΟΦΛΟΙΩΜΑΤΟΣ ΜΕΣΑ ΑΠΟ ΔΙΑΔΟΧΙΚΕΣ ΑΣΥΜΜΕΤΡΕΣ ΚΥΤΤΑΡΟΔΙΑΙΡΕΣΕΙΣ, ΣΤΙΣ ΟΠΟΙΕΣ ΟΙ ΜΙΚΡΟΣΩΛΗΝΙΣΚΟΙ ΔΙΑΔΡΑΜΑΤΙΖΑΝ ΣΗΜΑΝΤΙΚΟ ΡΟΛΟ. ΤΑ ΠΛΑΣΤΙΔΙΑ ΑΝΑΠΤΥΣΣΟΥΝ ΣΦΗΝΟΕΙΔΗΚΡΥΣΤΑΛΛΟΕΙΔΗ ΕΓΚΛΕΙΣΤΑ ΠΡΩΤΕΙΝΙΚΗΣ ΦΥΣΗΣ ΚΑΙ ΑΠΟΤΕΛΟΥΝ ΤΗΝ ΠΡΩΤΗ ΕΝΔΕΙΞΗ ΕΝΑΡΞΗΣ ΔΙΑΦΟΡΟΠΟΙΗΣΗΣ. ΤΑ ΩΡΙΜΑ ΗΘΜΟΣΤΟΙΧΕΙΑ ΣΤΕΡΟΥΝΤΑΙ ΛΕΙΤΟΥΡΓΙΚΟΥ ΠΥΡΗΝΑ, ΟΡΓΑΝΩΜΕΝΟΥ ΚΥΤΟΠΛΑΣΜΑΤΟΣ, ΡΙΒΟΣΩΜΑΤΩΝ, ΔΙΚΤΥΟΣΩΜΑΤΩΝ, ΜΙΚΡΟΣΩΛΗΝΙΣΚΟΥ ΚΑΙ ΧΥΜΟΤΟΠΙΩΝ."],"dc:identifier":["10.12681/eadd/0289","http://hdl.handle.net/10442/hedi/0289"],"dc:language":["gre"],"dc:publisher":["Aristotle University Of Thessaloniki (AUTH)","Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ)"],"dc:subject":["Βοτανική","Διαφοροποίηση","Μικροσωληνίσκοι","Οντογένεση","ΟΠΤΙΚΗ ΚΑΙ ΗΛΕΚΤΡΟΝΙΚΗ ΜΙΚΡΟΣΚΟΠΙΑ","ΣΥΓΚΡΙΤΙΚΗ ΑΝΑΤΟΜΙΑ","ΦΛΟΙΩΜΑ","Ωρίμανση","Aegilops","COMPARATIVE ANATOMY","Differentiation","LIGHT AND ELECTRON MICROSCOPY","Microtubules","Ontogeny","Phloem","SIEVE ELEMENTS","STRUCTUREAT MATURITY","Γεωπονικές Επιστήμες και Κτηνιατρική","Γεωπονία, Δασολογία και Αλιεία","Agricultural and Veterinary Sciences","Agriculture, Forestry and Fisheries"],"dc:title":["ΜΕΛΕΤΗ ΤΟΥ ΦΛΟΙΩΜΑΤΟΣ ΣΤΟ ΑΓΡΩΣΤΩΔΕΣ ΦΥΤΟ AEGILOPS COMOSA VAR THESSALICA ΣΕ ΕΠΙΠΕΔΟ ΟΠΤΙΚΗΣ ΚΑΙ ΗΛΕΚΤΡΟΝΙΚΗΣ ΜΙΚΡΟΣΚΟΠΙΑΣ","A LIGHT AND ELECTRON MICROSCOPY STUDY ON PHLOEM DIFFERENTIATION OF THE GRASS AEGILOPS COMOSA VAR THESSALICA"],"dc:type":["PhD Thesis"]},"updated_at":"2026-07-24T02:25:11Z"}