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논문 기본 정보

자료유형
학술저널
저자정보
저널정보
한국현미경학회 한국현미경학회지 한국현미경학회지 제38권 제4호
발행연도
2008.1
수록면
307 - 314 (8page)

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초록· 키워드

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Hydrophytes such as Spirodela polyrhiza form dormant turions to withstand cold winters. The turion is an anatomically distinct structure from which a vegetative frond arises later during germination. The turions sink to the bottom of the pond when temperatures drop and remain there throughout the winter. In the spring, they float to the surface and germinate into a new frond from the turion primordium. Unlike fronds, turions are known to possess small aerenchyma, starch grains, and relatively dense cytoplasm. These features allow the turions to survive the cold winter season at the bottom of the pond. Spirodela polyrhiza has been investigated previously to a great extent, especially in its physiological, biochemical and ecological attributes. However, a little is known about the structural features of the frond and turion during turion development. Thus, the aim of the present study was to reveal the structural characteristics of the frond and turion with regard to tissue differentiation, aerenchyma development, starch distribution, and ultrastructure, with the use of electron microscopy. A moderate degree of mesophyll tissue differentiation was found in the frond, whereas the turion did not exhibit such differentiation. Within the frond tissue, approximately 37~45% of the cellular volume was occupied by a large aerenchyma, but only 9~15% was taken up by the aerenchyma in the turion. The turion cells, especially those of the turion primordium, were derived from frond cells, and contained cytoplasm. Their cytoplasm was densely packed with plastids, mitochondria, endoplasmic reticulum, Golgi bodies, and microtubules. Plasmodesmata were also well developed within these cells. The most striking feature observed was the distribution of starch grains within the plastids of turion cells. Before the turion sank to the bottom of the pond, a considerable amount of starch accumulated in the plastid stroma. The starch grains dissolved when temperatures rose in the spring, and this promptly provided the nutrients which the primordium needed for turion germination. The turion therefore, was an appropriate dormant structure for free-floating, reduced hydrophytes like Spirodela polyhriza due to its small aerenchyma and large starch grains that aided in the purpose of sinking below the surface of the water to survive cold winters. The new fronds that arose from such turions grew rapidly in the spring, beginning the new life cycle.
#Hydrophytes #Spirodela polyhriza #Electron microscopy #Turion #Dormant structural developoment

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참고문헌 (24)

참고문헌 신청
Appenroth KJ / 1993 / Photophysiology of turion germination in Spirodela polyrhiza (L.) Schieiden XI. structural changes during red light induced responses / J Plant Physiol google schola Appenroth KJ / 2003 / No photoperiodoc control of the formation of turions in eight clones of Spirodela polyrhiza / J Plant Physiol 160 : 1329 ~ 1334 google schola Chaloupkova K / 1994 / The abscisic acid induction of a novel peroxidase is antagonized by cytokinin in Spirodela polyrhiza (L.) / Plant Physiol 105 : 497 ~ 507 google schola Fahn A / 1990 / Plant Anatomy / Pergamon Press : 10 ~ 49 google schola Harada T / 2003 / Starch degradation and sucrose metabolism during anaerobic growth of pondweed (Potamogeton distinctus A. Benn / turions. Plant and Soil 253 : 125 ~ 135 google schola

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