Tolerance of white bean (Phaseolus vulgaris) to white mold (Sclerotinia sclerotiorum) associated with tolerance to oxalic acid
Material type:
ArticleLanguage: English Description: 26(1):111-117Subject(s): LOC classification: - 25659
| Item type | Current library | Collection | Call number | Copy number | Status | Date due | Barcode | Item holds | |
|---|---|---|---|---|---|---|---|---|---|
Journal Article
|
CIAT Library Document collection CINFOS | Document Collection CINFOS | 25659 (Browse shelf(Opens below)) | c.1 | Short Loan | 100055233 |
En cv. de frijol blanco tolerantes y susceptibles a Sclerotinia sclerotiorum, se estudio la posible funcion del acido oxalico, una fitotoxina, en la patognesis del hongo. El crecimiento del hongo fue mucho mas lento en el cv. tolerante Ex Rico-23 que en los cv. susceptibles Kentwood y Seafarer. La diferencia se equilibro por la tasa de difusion del acido oxalico en el tejido foliar. La absorcion de acido oxalico en hojas cortadas por el peciolo dio como resultado sintomas mas severos similares a los de la pudricion marron en las hojas del cv. Kentwood que en las de Ex Rico-23. Cuando el acido oxalico C(14) se suministro por los peciolos, la radioactividad en el tejido intervenal de Kentwood fue aprox. 3 veces superior a la de Ex Rico-23. Las autorradiografias de las hojas mostraron que la radioactividad en Ex Rico-23 se limitaba a las venas principales y que la actividad en el tejido intervenal era baja, en tanto que en Seafarer y Kentwood la radioactividad no se acumulo en las venas sino que se distribuyo uniformemente por el tejido foliar, con una ligera acumulacion a lo largo de las margenes foliares. (RA-CIAT) spa
The possible role of oxalic acid, a phytotoxin, in the pathogenesis of Sclerotinia sclerotiorum was studied in tolerant and susceptible white bean cv. The growth of S. sclerotiorum was much slower in the tolerant cv. Ex Rico-23 than in the susceptible cv. Kentwood and Seafarer. The difference was paralleled by the rate of diffusion in leaf tissue of oxalic acid. Uptake of oxalic acid into excised leaves through the petiole resulted in more severe brown rot- like symptoms in the leaves of cv. Kentwood than in those of Ex Rico- 23. When (14)C oxalic acid was fed through petioles, radioactivity in the interveinal tissue of Kentwood was about 3 times higher than that in Ex Rico-23. Autoradiographs of leaves showed that radioactivity in Ex Rico-23 was confined to major veins and that activity in the interveinal tissue was low, whereas in Seafarer and Kentwood radioactivity did not accumulate in the veins but was distributed uniformly throughout the leaf tissue, with a slight accumulation along leaf margins. (AS) eng