Changes in the Structural Properties of Chloroplasts and Mitochondria in Response to Low Temperature in Perennial Ryegrass (Lolium perenne L.)

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  • ペレニアルライグラス(Lolium perenne L.)における低温に応答した葉緑体とミトコンドリアの構造変化

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Abstract

Changes in the ultrastructural properties of chloro-plasts and mitochondria in response to low temperature were analyzed by transmission electron microscopy in perennial ryegrass (Lolium perenne L.). Specimens from plants treated at 4℃ for 24 hr revealed increases in the sizes of chloroplasts in mesophyll cells and mitochondria in mesophyll and vascular bundle sheath cells. Longer cold treatments caused smaller amount of changes in the sizes of these organelles. The enlargement of chloroplasts in mesophyll cells was accompanied by a proportional decrease in the size of vacuoles. The lamella structure of chloroplast was maintained in mesophyll cells even after one month of cold treatment. DNA gel blot analyses showed no significant degradation of chloroplast or mitochondrial DNA during the cold treatment. The observed changes resembled changes that occur in cells of woody plants during seasonal transitions from summer to winter, suggesting that such changes are commonly involved in the process of cold acclimation in a wide variety of plants. Possible mechanisms that caused the observed changes were discussed in view of acquisition of cold tolerance in plants.

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