Abstract
The first leaves of resistant (var. Khapli) and susceptible (var. Little Club) species of wheat were heavily inoculated with P. graminis (Race 15B). The effect of the frequency of the pustules on their size and on the leaves is described. The oxygen consumption, total dry weight, total nitrogen, and sugar contents of leaf disks were measured at frequent intervals after inoculation. At infections of Little Club massive increases in dry weight occurred in 10 to 15 days, but the percentage total nitrogen remained close to that of healthy leaves. Oxygen consumption per unit dry weight or per unit of tissue nitrogen rose to from 2.5 to 3.0 times that for healthy tissue and then fell off again. The duration and degree of the rise were dependent on environmental conditions. At infections on Khapli, both dry weight and the percentage total nitrogen declined rapidly and the leaves turned yellow and died in about eight days, suggesting a rapid breakdown of protein. Oxygen consumption per unit dry weight or per unit of tissue nitrogen rose more rapidly, to from 2.0 to 2.5 times that of healthy tissue, and declined again sooner than at infections on Little Club. With both species, the 'accumulation' at infections of radioactive glucose, or its products, roughly paralleled the course of respiration. With leaves of Little Club, initially low in carbohydrate and having a low respiratory quotient, a marked rise in the respiratory quotient occurred at developing infections; little or no rise occurred with Khapli. The results of the sugar analyses suggested that the increase in respiration following infection was not initially dependent on an increase in the sugar content above that found in the healthy leaf. The significance of the results is discussed.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 11
Claim · model-written summary
Little Club infections gained dry weight over 10 to 15 days.
- Taxon
- WHEAT
Triticum aestivumt0 - Material
- Little Clube0
- Outcome
- dry weighte0
- Direction
- increasese0
- Qualifier
- 10 to 15 dayse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At infections of Little Club massive increases in dry weight occurred in 10 to 15 days”
t0“WHEAT”
Claim · model-written summary
Little Club total nitrogen percentage stayed near healthy leaves.
- Taxon
- WHEATTriticum aestivumt0
- Outcome
- percentage total nitrogene0
- Direction
- remained closee0
- Comparator
- healthy leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“percentage total nitrogen remained close to that of healthy leaves”
t0“WHEAT”
Claim · model-written summary
Little Club oxygen consumption rose 2.5 to 3 times healthy tissue then fell.
- Taxon
- WHEATTriticum aestivumt0
- Outcome
- Oxygen consumption per unit dry weight or per unit of tissue nitrogene0
- Direction
- rosee0
- Value
- 2.5 to 3.0 timese0
- Comparator
- healthy tissuee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Oxygen consumption per unit dry weight or per unit of tissue nitrogen rose to from 2.5 to 3.0 times that for healthy tissue and then fell off again”
t0“WHEAT”
Claim · model-written summary
The respiratory rise depended on environmental conditions.
- Taxon
- WHEATTriticum aestivumt0
- Outcome
- duration and degree of the risee0
- Setting
- environmental conditionse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The duration and degree of the rise were dependent on environmental conditions”
t0“WHEAT”
Claim · model-written summary
Khapli infection led to rapid declines in dry weight and nitrogen percentage.
- Taxon
- WHEATTriticum aestivumt0
- Material
- Khaplie0
- Outcome
- dry weight and the percentage total nitrogene0
- Direction
- declinede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At infections on Khapli, both dry weight and the percentage total nitrogen declined rapidly”
t0“WHEAT”
Claim · model-written summary
Khapli leaves yellowed and died within about eight days.
- Taxon
- WHEATTriticum aestivumt0
- Outcome
- leaves turned yellow and diede0
- Qualifier
- about eight dayse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the leaves turned yellow and died in about eight days”
t0“WHEAT”
Claim · model-written summary
Khapli oxygen consumption rose 2.0 to 2.5 times healthy tissue and declined sooner than Little Club.
- Taxon
- WHEATTriticum aestivumt0
- Outcome
- Oxygen consumption per unit dry weight or per unit of tissue nitrogene0
- Direction
- rosee0
- Value
- 2.0 to 2.5 timese0
- Comparator
- healthy tissuee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Oxygen consumption per unit dry weight or per unit of tissue nitrogen rose more rapidly, to from 2.0 to 2.5 times that of healthy tissue, and declined again sooner than at infections on Little Club”
t0“WHEAT”
Claim · model-written summary
Radioactive glucose accumulation tracked respiration in both species.
- Taxon
- WHEATTriticum aestivumt0
- Compound
- radioactive glucosee0
- Outcome
- accumulatione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the 'accumulation' at infections of radioactive glucose, or its products, roughly paralleled the course of respiration”
t0“WHEAT”
Claim · model-written summary
Little Club respiratory quotient rose at developing infections.
- Taxon
- WHEATTriticum aestivumt0
- Outcome
- respiratory quotiente0
- Direction
- risee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a marked rise in the respiratory quotient occurred at developing infections”
t0“WHEAT”
Claim · model-written summary
Khapli respiratory quotient showed little or no rise.
- Taxon
- WHEATTriticum aestivumt0
- Material
- Khaplie0
- Outcome
- little or no risee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“little or no rise occurred with Khapli”
t0“WHEAT”
Claim · model-written summary
The authors infer that the initial respiration increase did not require sugar accumulation beyond healthy leaves.
- Taxon
- WHEATTriticum aestivumt0
- Outcome
- increase in respiratione0
- Qualifier
- not initially dependent on an increase in the sugar contente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increase in respiration following infection was not initially dependent on an increase in the sugar content above that found in the healthy leaf”
t0“WHEAT”