Abstract
Varying the position of stem inoculation, the concentration of inoculum and the age of plant affected the reaction of cotton, Gossypium sp., to infection with Xanthomonas malvacearum (E. F. Sm.) Dowson. The extent of stem discoloration, internal and external, and the probability of disease ocurring in leaves by bacteria moving within the plant increased ( a ) the nearer the point of stem inoculation was to the apex, and ( b ) the higher the concentration of inoculum. The leaf symptoms were not the angular spots typical of primary leaf infection. Instead, bacteria seemed to lodge in, discolour and blacken sections of leaf veins. Then tissue next to the affected veins became water‐soaked and leaf sectors dependent upon these veins died and dried. These symptoms usually developed 14 to 55 days after inoculation in the expanding leaves. The amounts of stem discoloration and the probabilities of leaf symptoms developing were less when hypocotyls of old plants were inoculated than when hypocotyls of young plants were inoculated. The probabilities of leaf symptoms developing were similar, however, when young tissues in young and old plants were inoculated. American cotton, Gossypium hirsutum , was less affected by stem inoculation than Egyptian cotton, G. barbadense. Of the resistance factors against primary leaf infection only B 6m gave appreciable stem resistance.
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Claims 8
Claim · model-written summary
Stem discoloration and leaf disease probability increased when inoculation was closer to the apex.
- Treatment
- the nearer the point of stem inoculation was to the apexe0
- Outcome
- stem discoloration, internal and external, and the probability of disease ocurring in leavese0
- Direction
- increasede0
Not reportedTaxonInteractorComparator
Verbatim
e0“The extent of stem discoloration, internal and external, and the probability of disease ocurring in leaves by bacteria moving within the plant increased ( a ) the nearer the point of stem inoculation was to the apex”
Claim · model-written summary
Stem discoloration and leaf disease probability increased with inoculum concentration.
- Taxon
- cotton
Gossypium hirsutumt0 - Treatment
- the higher the concentration of inoculume0
- Outcome
- stem discoloration, internal and external, and the probability of disease ocurring in leavese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The extent of stem discoloration, internal and external, and the probability of disease ocurring in leaves by bacteria moving within the plant increased ( a ) the nearer the point of stem inoculation was to the apex, and ( b ) the higher the concentration of inoculum.”
t0“cotton”
Claim · model-written summary
Leaf symptoms involved darkened veins followed by water-soaked tissue and death of dependent leaf sectors.
- Taxon
- COTTONGossypium hirsutumt0
- Outcome
- leaf veinse0
- Qualifier
- water‐soakede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“bacteria seemed to lodge in, discolour and blacken sections of leaf veins. Then tissue next to the affected veins became water‐soaked and leaf sectors dependent upon these veins died and dried.”
t0“COTTON”
Claim · model-written summary
Leaf symptoms developed 14 to 55 days after inoculation in expanding leaves.
- Taxon
- COTTONGossypium hirsutumt0
- Organ / stage
- expanding leavese0
- Outcome
- symptomse0
- Value
- 14 to 55 dayse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These symptoms usually developed 14 to 55 days after inoculation in the expanding leaves.”
t0“COTTON”
Claim · model-written summary
Old plants inoculated at the hypocotyl had less stem discoloration and fewer leaf symptoms than young plants.
- Taxon
- COTTONGossypium hirsutumt0
- Treatment
- hypocotyls of old plants were inoculatede0
- Outcome
- stem discoloration and the probabilities of leaf symptoms developinge0
- Direction
- lesse0
- Comparator
- hypocotyls of young plants were inoculatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The amounts of stem discoloration and the probabilities of leaf symptoms developing were less when hypocotyls of old plants were inoculated than when hypocotyls of young plants were inoculated.”
t0“COTTON”
Claim · model-written summary
Leaf symptom probability was similar after inoculation of young tissues in young and old plants.
- Taxon
- COTTONGossypium hirsutumt0
- Treatment
- young tissues in young and old plants were inoculatede0
- Outcome
- probabilities of leaf symptoms developinge0
- Direction
- similare0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The probabilities of leaf symptoms developing were similar, however, when young tissues in young and old plants were inoculated.”
t0“COTTON”
Claim · model-written summary
American cotton was less affected by stem inoculation than Egyptian cotton.
- Taxon
- Gossypium hirsutumGossypium hirsutume0
- Material
- American cottone0
- Treatment
- stem inoculatione0
- Outcome
- affectede0
- Direction
- lesse0
- Comparator
- Egyptian cottone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“American cotton, Gossypium hirsutum , was less affected by stem inoculation than Egyptian cotton, G. barbadense.”
Claim · model-written summary
Among resistance factors tested, B 6m alone gave appreciable stem resistance.
- Taxon
- COTTONGossypium hirsutumt0
- Material
- B 6me0
- Outcome
- stem resistancee0
- Direction
- appreciablee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Of the resistance factors against primary leaf infection only B 6m gave appreciable stem resistance.”
t0“COTTON”
The same questions in other papers
inoculation · disease · Gossypium hirsutum (cotton)Positive and negative results
17 papers in the same direction as this paper · 23 in the opposite direction · 1 reporting no difference from an alternative
- negative
- negative
- negative
38 papers more in this group
See all 42 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.