Abstract
Abstract To clarify the influence of post‐jointing drought on the ear‐bearing and seed‐setting characteristics of the main stem and tillers of winter wheat ( Triticum aestivum L.), a pot experiment was conducted with cultivars “Shannong 29” (SN29) and “Heng 0628” (H0628), and five water regimes: mild drought (WR1) and severe drought (WR2) for 0–5 days after jointing, mild drought (WR3) and severe drought (WR4) for 0–10 days after jointing and adequate water supply as a control (CK). The present study focused on primary tillers (appear in the axils of main stem leaves: T1, T2, T3, T4, etc.), as well as on secondary tillers (appear from the bud in the axil of the prophyll: T10 and T20; appear in the axil of the first leaf of the primary tiller T1: T11). The yield components of tillers showed a downward trend with increasing tiller position and drought degree and duration, and the kernels per spike, single kernels weight and grain yield per spike of tillers T2, T3, T10 and T4 decreased more than those of the other tillers. These outcomes may be related to the spike developmental stages at the time of the drought period. Severe drought during the period from when the stamen primordium is first present (Waddington’s stage 4) to when the carpel extends around the three sides of the ovule (Waddington’s stage 5) significantly decreased the seed set of tillers, but short‐term (5 days) mild drought during this period and even a short‐term severe drought before Waddington’s stage 4 had little effect on the seed set of tillers. The ear‐bearing capacity of tillers was determined not only by the spike developmental stage, but also by the gap from the main stem and the competition of nutrition and space between tillers. Although the ear‐bearing rate of tillers T3 and T10 decreased rapidly after the short‐term mild drought, the increase in the ear‐bearing rate of tillers T20 and T11 effectively compensated for the loss of the number of spikes per plant. Therefore, the short‐term mild drought at the jointing stage had no significant effect on the grain yield of the two cultivars. The tillers T2, T3, T10 and T4 were sensitive to soil moisture in the jointing stage and had high plasticity. During this period, if timely irrigation improves soil moisture, it is expected to increase the ear‐bearing rate and seed set of these tillers, thereby increasing grain yield.
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Claims 11
Claim · model-written summary
Tiller yield components decreased with higher tiller position and greater drought degree and duration.
- Taxon
- winter wheat
Triticum aestivumt0 - Treatment
- drought degree and duratione0
- Outcome
- yield components of tillerse0
- Direction
- downward trende0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The yield components of tillers showed a downward trend with increasing tiller position and drought degree and duration”
t0“winter wheat”
Claim · model-written summary
Kernels per spike, kernel weight and grain yield per spike of T2, T3, T10 and T4 decreased more than in other tillers.
- Taxon
- winter wheatTriticum aestivumt0
- Organ / stage
- tillers T2, T3, T10 and T4e0
- Outcome
- kernels per spike, single kernels weight and grain yield per spikee0
- Direction
- decreased moree0
- Comparator
- the other tillerse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the kernels per spike, single kernels weight and grain yield per spike of tillers T2, T3, T10 and T4 decreased more than those of the other tillers.”
t0“winter wheat”
Claim · model-written summary
Severe drought during Waddington stages 4 to 5 significantly decreased tiller seed set.
- Taxon
- winter wheatTriticum aestivumt0
- Treatment
- Severe droughte0
- Outcome
- seed set of tillerse0
- Direction
- decreasede0
- Qualifier
- Waddington’s stage 4e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Severe drought during the period from when the stamen primordium is first present (Waddington’s stage 4) to when the carpel extends around the three sides of the ovule (Waddington’s stage 5) significantly decreased the seed set of tillers”
t0“winter wheat”
Claim · model-written summary
Five days of mild drought during stages 4 to 5 had little effect on tiller seed set.
- Taxon
- winter wheatTriticum aestivumt0
- Treatment
- short‐term (5 days) mild droughte0
- Outcome
- seed set of tillerse0
- Direction
- little effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“short‐term (5 days) mild drought during this period and even a short‐term severe drought before Waddington’s stage 4 had little effect on the seed set of tillers.”
t0“winter wheat”
Claim · model-written summary
Short-term severe drought before Waddington stage 4 had little effect on tiller seed set.
- Taxon
- winter wheatTriticum aestivumt0
- Treatment
- short‐term severe droughte0
- Outcome
- seed set of tillerse0
- Direction
- little effecte0
- Qualifier
- before Waddington’s stage 4e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“short‐term (5 days) mild drought during this period and even a short‐term severe drought before Waddington’s stage 4 had little effect on the seed set of tillers.”
t0“winter wheat”
Claim · model-written summary
Spike developmental stage, separation from the main stem, and competition among tillers determined ear-bearing capacity.
- Taxon
- winter wheatTriticum aestivumt0
- Outcome
- ear‐bearing capacity of tillerse0
- Qualifier
- spike developmental stage, but also by the gap from the main stem and the competition of nutrition and space between tillerse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ear‐bearing capacity of tillers was determined not only by the spike developmental stage, but also by the gap from the main stem and the competition of nutrition and space between tillers.”
t0“winter wheat”
Claim · model-written summary
Short-term mild drought rapidly decreased ear-bearing rate of T3 and T10 tillers.
- Taxon
- winter wheatTriticum aestivumt0
- Treatment
- short‐term mild droughte0
- Outcome
- ear‐bearing rate of tillers T3 and T10e0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the ear‐bearing rate of tillers T3 and T10 decreased rapidly after the short‐term mild drought”
t0“winter wheat”
Claim · model-written summary
Ear-bearing rate of T20 and T11 tillers increased and compensated for spike loss per plant.
- Taxon
- winter wheatTriticum aestivumt0
- Outcome
- ear‐bearing rate of tillers T20 and T11e0
- Direction
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the increase in the ear‐bearing rate of tillers T20 and T11 effectively compensated for the loss of the number of spikes per plant.”
t0“winter wheat”
Claim · model-written summary
Short-term mild drought at jointing had no significant effect on grain yield of either cultivar.
- Taxon
- winter wheatTriticum aestivumt0
- Treatment
- short‐term mild droughte0
- Outcome
- grain yielde0
- Direction
- no significant effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the short‐term mild drought at the jointing stage had no significant effect on the grain yield of the two cultivars.”
t0“winter wheat”
Claim · model-written summary
T2, T3, T10 and T4 tillers were sensitive to soil moisture at jointing and showed high plasticity.
- Taxon
- winter wheatTriticum aestivumt0
- Outcome
- sensitive to soil moisture in the jointing stage and had high plasticitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The tillers T2, T3, T10 and T4 were sensitive to soil moisture in the jointing stage and had high plasticity.”
t0“winter wheat”
Claim · model-written summary
The authors expect timely irrigation at jointing to increase ear-bearing rate, seed set and grain yield.
- Taxon
- winter wheatTriticum aestivumt0
- Outcome
- timely irrigation improves soil moisturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“if timely irrigation improves soil moisture, it is expected to increase the ear‐bearing rate and seed set of these tillers, thereby increasing grain yield.”
t0“winter wheat”
The same questions in other papers
drought · yield · Triticum aestivum (wheat)Positive and negative results
536 papers in the same direction as this paper · 95 in the opposite direction
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