Abstract
Drought and heat tolerance tests that were developed for sorghum ( Sorghum bicolor L. Moench) were adapted to and evaluated in field grown wheat ( Triticum aestivum L. and T. durum Desf.) during 1977/1978 and 1978/1979. The drought tolerance test is based on the measurement of the electroconductivity of aqueous media containing leaf discs that were previously water stressed in vitro by exposure to a solution of polyethylene glycol‐6,000 (PEG). The heat tolerance test is similarly based on exposure of leaf discs to heating, in vitro, to 44 C. Drought tolerance of wheat leaves decreased with plant age. For a given plant growth stage, some variation was revealed in drought tolerance, according to leaf position. Maximal separation of wheat cultivars in drought tolerance was obtained with 40% (w/v) solution of PEG, when plants were grown under conditions of favorable moisture regime and sampled during the late jointing growth stage. Wheat was more drought tolerant than maize, sorghum or millet, based on published data. When plants were sampled during a period of water stress, they were more drought tolerant than well‐watered plants, indicating adjustment of cell membrane stability to drought stress. Wheat cultivars varied in their ability to adjust, in this respect. Unlike in sorghum, drought and heat tolerance were not correlated in wheat. The inclusion of a limited number of barley ( Hordeum vulgare ) and triticale (X Triticosecale Wittmark ) genotypes in this study indicated that the methods discussed work equally well with these crop plants.
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Claims 9
Claim · model-written summary
Drought tolerance of wheat leaves decreased with plant age.
- Taxon
- Wheat
Triticum aestivumt0 - Organ / stage
- leavese1
- Outcome
- Drought tolerancee1
- Direction
- decreasede1
- Qualifier
- with plant agee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Drought and Heat Tolerance in Wheat”
e1“Drought tolerance of wheat leaves decreased with plant age”
Claim · model-written summary
Drought tolerance varied according to leaf position at a given growth stage.
- Taxon
- WheatTriticum aestivumt0
- Outcome
- drought tolerancee2
- Qualifier
- according to leaf positione2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Drought and Heat Tolerance in Wheat”
e2“For a given plant growth stage, some variation was revealed in drought tolerance, according to leaf position”
Claim · model-written summary
Maximal separation of wheat cultivars in drought tolerance was obtained with 40% (w/v) PEG under favourable moisture, sampled at late jointing.
- Taxon
- WheatTriticum aestivumt0
- Organ / stage
- late jointing growth stagee3
- Treatment
- 40% (w/v) solution of PEGe3
- Outcome
- separation of wheat cultivars in drought tolerancee3
- Value
- 40% (w/v)e3
- Qualifier
- favorable moisture regimee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Drought and Heat Tolerance in Wheat”
e3“Maximal separation of wheat cultivars in drought tolerance was obtained with 40% (w/v) solution of PEG, when plants were grown under conditions of favorable moisture regime and sampled during the late jointing growth stage”
Claim · model-written summary
Wheat sampled under water stress was more drought tolerant than well-watered plants.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- water stresse4
- Outcome
- drought tolerante4
- Direction
- moree4
- Comparator
- well‐watered plantse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Drought and Heat Tolerance in Wheat”
e4“When plants were sampled during a period of water stress, they were more drought tolerant than well‐watered plants”
Claim · model-written summary
Wheat membrane stability is adjusted under drought stress.
- Taxon
- WheatTriticum aestivumt0
- Outcome
- adjustment of cell membrane stabilitye5
- Qualifier
- to drought stresse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Drought and Heat Tolerance in Wheat”
e5“indicating adjustment of cell membrane stability to drought stress”
Claim · model-written summary
Wheat cultivars differed in their ability to adjust drought tolerance.
- Taxon
- WheatTriticum aestivume6
- Outcome
- ability to adjuste6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“Wheat cultivars varied in their ability to adjust, in this respect”
Claim · model-written summary
Drought and heat tolerance were not correlated in wheat, unlike in sorghum.
- Taxon
- wheatTriticum aestivume7
- Outcome
- drought and heat tolerancee7
- Direction
- not correlatede7
- Comparator
- sorghume7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“Unlike in sorghum, drought and heat tolerance were not correlated in wheat”
Claim · model-written summary
Wheat was more drought tolerant than maize, sorghum or millet, based on published data.
- Taxon
- WheatTriticum aestivume1
- Outcome
- drought tolerante1
- Direction
- moree1
- Comparator
- maize, sorghum or millete1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Wheat was more drought tolerant than maize, sorghum or millet, based on published data”
Claim · model-written summary
The drought and heat tolerance test methods work equally well with barley and triticale as with wheat.
- Outcome
- the methods discussed work equally welle1
Not reportedComparator
Schema note from the model: no comparator or numeric value stated in the abstract; outcome only
Verbatim
e1“the methods discussed work equally well with these crop plants”
The same questions in other papers
drought · disease · Triticum aestivum (wheat)Positive and negative results
21 papers in the same direction as this paper · 13 in the opposite direction
- negative
- negative
- negative
31 papers more in this group
See all 35 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.