Sieve-element plastids ofTriticum andAegilops (Poaceae) |
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Authors: | E P Eleftheriou |
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Institution: | (1) Botanical Institute, University of Thessaloniki, GR-54006 Thessaloniki, Greece |
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Abstract: | Fourteen taxa of the Triticum-Aegilops group have been investigated for their sieve-element plastids. At maturity they contain dense and thin crystalloid inclusions and are classified into the PIIc' plastid type; onlyAe. comosa var.biaristata lacked the thin crystalloids and thus conforms to the PII c type. The proteinaceous nature of the crystalloids was demonstrated by application of proteolytic enzymes. Ultrastructural evidence suggests that both kinds of crystalloid inclusions are involved in the sealing of sieve-plate pores of injured sieve tubes. Measurements and calculations of the spacings and angles carried out on crystalloid prints permitted the construction of a two- and three-dimensional pattern forT. aestivum thin crystalloids. |
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Keywords: | Poaceae Triticum Aegilops Sieve-element plastids crystalloid inclusions ultrastructure two- and three-dimensional patterns |
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