Abstract
The second foliar leaves of Cheyenne, a drought-hardy, and Ponca, a drought-susceptible variety of winter wheat were compared anatomically before and after subjection to specific periods of moisture stress. Plants were grown in the greenhouse, and the severity of stress was estimated by measurements of the relative turgidity of the leaves. Stained and mounted serial sections were examined with regard to over-all histology, cell patterns, and cellular inclusions. Significant contrasts between untreated plants of the two varieties were: (a) relatively larger amounts of xylem tissue in Ponca, and (b) a greater proportion of sclerenchyma tissue in Cheyenne. The leaves of stressed plants showed pronounced wilting after more than 4 days of drought, and the water content level in the tissue was directly related to anatomical changes. Changes resulting from water stress were thickened cell walls, increased deposition of lignin in xylem elements and bundle sheath cells, and progressive plasmolysis in nuclei and plastids. The degree of anatomical disorganization as correlated with specific levels of internal moisture stress was greater in variety Ponca than in Cheyenne. When rewatered after 4 days of drought, 75% of the Cheyenne plants survived, but variety Ponca showed only 63% survival. The differential response between the two varieties is attributed to underlying physiological differences which may in part account for the greater drought resistance in Cheyenne.
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Claims 11
Claim · model-written summary
In untreated plants, Ponca had relatively larger amounts of xylem tissue than Cheyenne.
- Taxon
- winter wheat
Triticum aestivume0 - Material
- Poncae0
- Outcome
- xylem tissuee1
- Direction
- relatively largere1
- Comparator
- Cheyennee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The second foliar leaves of Cheyenne, a drought-hardy, and Ponca, a drought-susceptible variety of winter wheat were compared anatomically before and after subjection to specific periods of moisture stress”
e1“Significant contrasts between untreated plants of the two varieties were: (a) relatively larger amounts of xylem tissue in Ponca, and (b) a greater proportion of sclerenchyma tissue in Cheyenne”
Claim · model-written summary
In untreated plants, Cheyenne had a greater proportion of sclerenchyma tissue than Ponca.
- Taxon
- winter wheatTriticum aestivume0
- Material
- Cheyennee0
- Outcome
- sclerenchyma tissuee1
- Direction
- greater proportione1
- Comparator
- Poncae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The second foliar leaves of Cheyenne, a drought-hardy, and Ponca, a drought-susceptible variety of winter wheat were compared anatomically before and after subjection to specific periods of moisture stress”
e1“Significant contrasts between untreated plants of the two varieties were: (a) relatively larger amounts of xylem tissue in Ponca, and (b) a greater proportion of sclerenchyma tissue in Cheyenne”
Claim · model-written summary
Water stress thickened leaf cell walls of wheat.
- Taxon
- winter wheatTriticum aestivume0
- Treatment
- water stresse2
- Outcome
- cell wallse2
- Direction
- thickenede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The second foliar leaves of Cheyenne, a drought-hardy, and Ponca, a drought-susceptible variety of winter wheat were compared anatomically before and after subjection to specific periods of moisture stress”
e2“Changes resulting from water stress were thickened cell walls, increased deposition of lignin in xylem elements and bundle sheath cells, and progressive plasmolysis in nuclei and plastids”
Claim · model-written summary
Water stress increased lignin deposition in xylem elements and bundle sheath cells of wheat leaves.
- Taxon
- winter wheatTriticum aestivume0
- Organ / stage
- xylem elements and bundle sheath cellse2
- Treatment
- water stresse2
- Outcome
- deposition of lignine2
- Direction
- increasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The second foliar leaves of Cheyenne, a drought-hardy, and Ponca, a drought-susceptible variety of winter wheat were compared anatomically before and after subjection to specific periods of moisture stress”
e2“Changes resulting from water stress were thickened cell walls, increased deposition of lignin in xylem elements and bundle sheath cells, and progressive plasmolysis in nuclei and plastids”
Claim · model-written summary
Water stress caused progressive plasmolysis in nuclei and plastids of wheat leaves.
- Taxon
- winter wheatTriticum aestivume0
- Organ / stage
- nuclei and plastidse2
- Treatment
- water stresse2
- Outcome
- plasmolysise2
- Direction
- progressivee2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The second foliar leaves of Cheyenne, a drought-hardy, and Ponca, a drought-susceptible variety of winter wheat were compared anatomically before and after subjection to specific periods of moisture stress”
e2“Changes resulting from water stress were thickened cell walls, increased deposition of lignin in xylem elements and bundle sheath cells, and progressive plasmolysis in nuclei and plastids”
Claim · model-written summary
The degree of anatomical disorganization was greater in Ponca than in Cheyenne, as correlated with internal moisture stress.
- Taxon
- winter wheatTriticum aestivume0
- Material
- Poncae3
- Treatment
- internal moisture stresse3
- Outcome
- anatomical disorganizatione3
- Direction
- greatere3
- Comparator
- Cheyennee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The second foliar leaves of Cheyenne, a drought-hardy, and Ponca, a drought-susceptible variety of winter wheat were compared anatomically before and after subjection to specific periods of moisture stress”
e3“The degree of anatomical disorganization as correlated with specific levels of internal moisture stress was greater in variety Ponca than in Cheyenne”
Claim · model-written summary
Water content level in the tissue was related to anatomical changes in stressed wheat leaves; the direction is not stated.
- Taxon
- winter wheatTriticum aestivume0
- Treatment
- water content level in the tissuee5
- Outcome
- anatomical changese5
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The second foliar leaves of Cheyenne, a drought-hardy, and Ponca, a drought-susceptible variety of winter wheat were compared anatomically before and after subjection to specific periods of moisture stress”
e5“The leaves of stressed plants showed pronounced wilting after more than 4 days of drought, and the water content level in the tissue was directly related to anatomical changes”
Claim · model-written summary
75% of Cheyenne plants survived when rewatered after 4 days of drought.
- Taxon
- winter wheatTriticum aestivume0
- Material
- Cheyennee0
- Treatment
- rewatered after 4 days of droughte4
- Outcome
- plants survivede4
- Value
- 75%e4
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The second foliar leaves of Cheyenne, a drought-hardy, and Ponca, a drought-susceptible variety of winter wheat were compared anatomically before and after subjection to specific periods of moisture stress”
e4“When rewatered after 4 days of drought, 75% of the Cheyenne plants survived, but variety Ponca showed only 63% survival”
Claim · model-written summary
Only 63% of Ponca plants survived when rewatered after 4 days of drought.
- Taxon
- winter wheatTriticum aestivume0
- Material
- Poncae0
- Treatment
- rewatered after 4 days of droughte4
- Outcome
- survivale4
- Value
- 63%e4
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The second foliar leaves of Cheyenne, a drought-hardy, and Ponca, a drought-susceptible variety of winter wheat were compared anatomically before and after subjection to specific periods of moisture stress”
e4“When rewatered after 4 days of drought, 75% of the Cheyenne plants survived, but variety Ponca showed only 63% survival”
Claim · model-written summary
The differential drought response of the two varieties may partly reflect underlying physiological differences that account for the greater drought resistance of Cheyenne.
- Taxon
- winter wheatTriticum aestivume0
- Material
- Cheyennee6
- Outcome
- drought resistancee6
- Qualifier
- underlying physiological differencese6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The second foliar leaves of Cheyenne, a drought-hardy, and Ponca, a drought-susceptible variety of winter wheat were compared anatomically before and after subjection to specific periods of moisture stress”
e6“The differential response between the two varieties is attributed to underlying physiological differences which may in part account for the greater drought resistance in Cheyenne”
Claim · model-written summary
Stressed wheat leaves showed pronounced wilting after more than 4 days of drought.
- Taxon
- winter wheatTriticum aestivume0
- Treatment
- more than 4 days of droughte5
- Outcome
- wiltinge5
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The second foliar leaves of Cheyenne, a drought-hardy, and Ponca, a drought-susceptible variety of winter wheat were compared anatomically before and after subjection to specific periods of moisture stress”
e5“The leaves of stressed plants showed pronounced wilting after more than 4 days of drought, and the water content level in the tissue was directly related to anatomical changes”
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