Premium
VASCULAR DYSFUNCTION IN FUSARIUM WILT OF TOMATO
Author(s) -
Corden Malcolm E.,
Chambers Henrietta L.
Publication year - 1966
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1966.tb07336.x
Subject(s) - vascular bundle , xylem , biology , petiole (insect anatomy) , notching , waterproofing , vascular tissue , fusarium oxysporum , botany , wilting , anatomy , materials science , genus , composite material , metallurgy
Leaves on tomato plants infected with Fusarium oxysporum f. lycopersici frequently wilt unilaterally when the vascular bundles supplying the affected leaflets are diseased. However, when the vascular bundles on one side of healthy petioles are severed by notching the petiole base, the entire leaf remains turgid. Leaflets on the notched side receive water by diffusion between bundles at the petiole tip. Lateral translocation of water out of individual vessels and between bundles in diseased xylem is impaired by the impregnation of vessel walls, intercellular spaces, and cells adjacent to vessels with the products of vascular discoloration. Waterproofing of vascular bundles can be induced in excised healthy leaves by culture filtrates of the pathogen and catechol. Waterproofing of vessels may play an important role in vascular dysfunction by confining water to individual vessels and thereby increasing the importance of vessel occlusions.