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Vascular structure and distribution of vascular pathogens in cotton

1976; Academic Press; Volume: 9; Issue: 1 Linguagem: Inglês

10.1016/0048-4059(76)90078-3

1876-7974

C.H. Beckman, G.E. VanderMolen, W. C. Mueller, M. E. Mace,

Plant Pathogens and Fungal Diseases

Vascular transport patterns in cotton cultivars that are differentially resistant to Venticillium or Fusarium wilt were compared after the introduction of vinyl particles, spores or eosin dye into severed roots or stems. Spores and particles were effectively screened out of the transpiration stream by reticulate-scalariform end walls that occur periodically in the xylem vessels. Although spore trapping is an essential first step in the loicalization of vascular infections, innate vessel length is apparently not a differentiating factor in resistance, for differences in spore uptake distances were minor and not related to relative wilt resistance or susceptibility of the cultivars. Similarly, in all cultivars dye moved laterally from a single rootlet into essentially all the leaf bases. Therefore, differences in degree of articulation of vessels are ruled out as a possible determinant in resistance. When vinyl particle suspensions were taken up into the vascular elements of plants of different ages, the particle passage distances as plants matured. The increase in passage distances was compatible in all cultivars are therefore not related to resistance.