Abstract
Previous work on the effects of water stress on wheat spike morphogenesis and floret survival has been conducted mainly on standard height (nondwarf) cultivars. Effects of water stress on the spike were therefore studied using a semidwarf spring wheat ( Triticum aestivum L.). Plants were raised in the glasshouse under 8 h and 16 h photoperiods, and 7‐day periods of water stress were imposed during different development phases up to spike‐emergence. Water stress at critical times generally caused floret and sometimes whole spikelet death at the terminal ends of the spike. Water stress during the late vegetative phase just before spike initiation adversely affected the final number of fertile florets per spike, the reduction in fertile florets being accounted for by fewer spikelet primordia being formed. Water stress during late internode elongation prior to spike emergence resulted in death of florets and whole spikelets at the terminal and basal ends of the spike. The spike initial had minimum sensitivity to water stress during the period immediately following the initiation of the terminal spikelet. Stress effects in semidwarf wheat particularly during internode elongation, appeared to be similar to those reported for conventional standard height spring wheats. Greater spikelet number per spike was obtained in the short days (8 h) than in the long days (16 h). This was mainly due to photoperiod and possibly also because water stress of the same duration and similar intensity may have been relatively less severe in the prolonged development phases in the short days.
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Claims 8
Claim · model-written summary
Water stress at critical times killed florets and sometimes terminal spikelets.
- Taxon
- Wheat
Triticum aestivumt0 - Organ / stage
- terminal ends of the spikee0
- Treatment
- Water stresse0
- Outcome
- floret and sometimes whole spikelet deathe0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water stress at critical times generally caused floret and sometimes whole spikelet death at the terminal ends of the spike.”
t0“Wheat”
Claim · model-written summary
Late vegetative water stress reduced fertile florets per spike.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- Water stress during the late vegetative phasee0
- Outcome
- final number of fertile florets per spikee0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water stress during the late vegetative phase just before spike initiation adversely affected the final number of fertile florets per spike, the reduction in fertile florets being accounted for by fewer spikelet primordia being formed.”
t0“Wheat”
Claim · model-written summary
Late vegetative water stress reduced formation of spikelet primordia.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- Water stresse1
- Outcome
- spikelet primordia being formede0
- Direction
- fewere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the reduction in fertile florets being accounted for by fewer spikelet primordia being formed.”
t0“Wheat”
e1“Water stress during the late vegetative phase just before spike initiation adversely affected the final number of fertile florets per spike”
Claim · model-written summary
Water stress during internode elongation killed terminal and basal florets and spikelets.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- Water stress during late internode elongatione0
- Outcome
- death of florets and whole spikeletse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water stress during late internode elongation prior to spike emergence resulted in death of florets and whole spikelets at the terminal and basal ends of the spike.”
t0“Wheat”
Claim · model-written summary
The spike initial had minimum stress sensitivity after terminal spikelet initiation.
- Taxon
- WheatTriticum aestivumt0
- Organ / stage
- spike initiale0
- Outcome
- minimum sensitivity to water stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The spike initial had minimum sensitivity to water stress during the period immediately following the initiation of the terminal spikelet.”
t0“Wheat”
Claim · model-written summary
Semidwarf wheat stress effects appeared similar to standard height spring wheats.
- Taxon
- wheatTriticum aestivume0
- Outcome
- Stress effectse0
- Comparator
- conventional standard height spring wheatse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Stress effects in semidwarf wheat particularly during internode elongation, appeared to be similar to those reported for conventional standard height spring wheats.”
Claim · model-written summary
Short days produced more spikelets per spike than long days.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- short days (8 h)e0
- Outcome
- spikelet number per spikee0
- Direction
- Greatere0
- Comparator
- long days (16 h)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Greater spikelet number per spike was obtained in the short days (8 h) than in the long days (16 h).”
t0“Wheat”
Claim · model-written summary
The greater spikelet number in short days was mainly attributed to photoperiod and possibly milder relative water stress.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- water stresse0
- Outcome
- spikelet number per spikee1
- Qualifier
- photoperiode0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This was mainly due to photoperiod and possibly also because water stress of the same duration and similar intensity may have been relatively less severe in the prolonged development phases in the short days.”
t0“Wheat”
e1“Greater spikelet number per spike was obtained in the short days (8 h) than in the long days (16 h).”
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