Studies on the Ultra-Structural Changes in Root (Wilt) Diseased Palms
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1993
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Coconut root (wilt) disease, a debilitating malady is characterized by external symptoms like flaccidity, yellowing and necrosis. Anatomy of the diseased roots revealed alterations in vascular tissues in the form of tylosis of xylem vessels, gummosis and phloem necrosis. In the course of the investigation to detect submicroscopic pafhogen(s) associated with the disease, tissues of submeristem, bases of rudimentary leaves, rachilla of juvenile inflorescence, spear leaf, mature leaf and root tips were studied. The samples examined were from palms of various intensities of disease. The prominent structural changes noticed were an elaboration of the membrane system with unusually large number of cell organelles, presence of paramural bodies and accumulation of electron dense material filling the sieve tube indicating necrotic obliteration of the phloem cells and deposition of callose adjacent to the sieve pores. Disproportionately high number of phytoferritin particles and cuneate crystalline inclusions were the other prominent alterations observed. These structural anomalies in relation to the disease are discussed.
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J.Plantn.Crops 1993 suppl. v-21 p-113-118