Abstract
A field micro-plot experiment was conducted to study the effect of early-stage regulated deficit irrigation (RDI) on the stress tolerance of winter wheat in the late growth stage. Plants were subjected to two RDI treatments: proper water deficits (45-55% field water capacity) were imposed during tillering—the beginning of the spring growth stage (T1) and during the beginning of spring growth to the end of the stem elongation stage (T2). The control plants (CK) were maintained with an adequate water supply until anthesis. The results showed that T1 and T2 shortened the length of the first and second internodes, and increased their weight per unit length, and thereby enhanced stem lodging resistance. Although post-anthesis drought and waterlogging lowered leaf photosynthetic rate and root respiration rate, the two RDI treatments improved significantly compared to the control. The two RDI treatments had no significant effects on grain yield under post-anthesis well-watered conditions but increased grain yield and yield stability of wheat under post-anthesis water stress. In addition, T1 and T2 significantly reduced water consumption and increased water productivity (WP) of wheat compared to the control. In summary, this study shows that appropriate RDI at early growth stages increased grain yield and yield stability through improving population characteristics, root respiration and photosynthesis of plants under post-anthesis water stress conditions. Copyright © 2016 John Wiley & Sons, Ltd. Une expérience de terrain en micro-parcelle a été menée pour étudier l'effet du déficit d'irrigation (RDI) au stade précoce du blé d'hiver sur sa tolérance au stress en fin de la croissance. Les plantes ont été soumises à deux traitements de RDI: les déficits en eau ont été imposés du tallage au stade de développement de la pousse (T1), et de ce stade à la fin du stade tige d'allongement de la tige (T2). Les plantes de contrôle (CK) ont eu un approvisionnement en eau adéquat jusqu'à la floraison. Les résultats ont montré que T1 et T2 raccourcissent la longueur des premier et deuxième inter-nœuds, et augmentent leur poids par unité de longueur, et, par voie de conséquence, augmentent la résistance de la tige. Bien que la sécheresse et l'engorgement post-anthèse aient abaissé le taux de photosynthèse des feuilles et le taux de respiration des racines, les deux traitements de RDI ont montré une amélioration considérable du rendement par rapport au contrôle. Les deux traitements RDI n'ont pas montré d'effet significatif sur le rendement en grain en cas de post-anthèse correctement arrosée, alors que ce même rendement a augmenté et avec une meilleure stabilité dans le cas de post-anthèse hydriquement stressée. En outre, T1 et T2 se sont accompagnés d'une réduction significative de la consommation en eau du blé et de l'augmentation de la productivité de l'eau (WP). En résumé, cette étude montre qu'une RDI appropriée au début de croissance a augmenté le rendement en grain et la stabilité du rendement grâce à l'amélioration des caractéristiques de la population, la respiration des racines et la photosynthèse des plantes sous conditions de stress hydrique post-anthèse. Copyright © 2016 John Wiley & Sons, Ltd.
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Claims 11
Claim · model-written summary
RDI shortened the first and second internodes.
- Taxon
- Winter Wheat
Triticum aestivumt0 - Treatment
- T1 and T2e0
- Outcome
- length of the first and second internodese0
- Direction
- shortenede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“T1 and T2 shortened the length of the first and second internodes”
t0“Winter Wheat”
Claim · model-written summary
RDI increased internode weight per unit length.
- Taxon
- Winter WheatTriticum aestivumt0
- Treatment
- T1 and T2e0
- Outcome
- weight per unit lengthe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“T1 and T2 shortened the length of the first and second internodes, and increased their weight per unit length”
t0“Winter Wheat”
Claim · model-written summary
RDI enhanced stem lodging resistance.
- Taxon
- Winter WheatTriticum aestivumt0
- Treatment
- T1 and T2e0
- Outcome
- stem lodging resistancee0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“T1 and T2 shortened the length of the first and second internodes, and increased their weight per unit length, and thereby enhanced stem lodging resistance.”
t0“Winter Wheat”
Claim · model-written summary
Post-anthesis drought and waterlogging lowered leaf photosynthetic rate.
- Taxon
- Winter WheatTriticum aestivumt0
- Treatment
- post-anthesis drought and waterlogginge0
- Outcome
- leaf photosynthetic ratee0
- Direction
- lowerede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“post-anthesis drought and waterlogging lowered leaf photosynthetic rate and root respiration rate”
t0“Winter Wheat”
Claim · model-written summary
Post-anthesis drought and waterlogging lowered root respiration.
- Taxon
- Winter WheatTriticum aestivumt0
- Treatment
- post-anthesis drought and waterlogginge0
- Outcome
- root respiration ratee0
- Direction
- lowerede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“post-anthesis drought and waterlogging lowered leaf photosynthetic rate and root respiration rate”
t0“Winter Wheat”
Claim · model-written summary
RDI significantly improved leaf photosynthesis and root respiration under post-anthesis stress.
- Taxon
- Winter WheatTriticum aestivumt0
- Treatment
- two RDI treatmentse0
- Outcome
- leaf photosynthetic rate and root respiration ratee0
- Direction
- improvede0
- Comparator
- the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Although post-anthesis drought and waterlogging lowered leaf photosynthetic rate and root respiration rate, the two RDI treatments improved significantly compared to the control.”
t0“Winter Wheat”
Claim · model-written summary
RDI did not significantly affect grain yield with post-anthesis adequate water.
- Taxon
- Winter WheatTriticum aestivumt0
- Treatment
- two RDI treatmentse0
- Outcome
- grain yielde0
- Direction
- no significant effectse0
- Qualifier
- post-anthesis well-watered conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The two RDI treatments had no significant effects on grain yield under post-anthesis well-watered conditions”
t0“Winter Wheat”
Claim · model-written summary
RDI increased grain yield under post-anthesis water stress.
- Taxon
- wheatTriticum aestivume0
- Treatment
- two RDI treatmentse1
- Outcome
- grain yielde0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased grain yield and yield stability of wheat under post-anthesis water stress”
e1“The two RDI treatments had no significant effects on grain yield”
t0“Winter Wheat”
Claim · model-written summary
RDI increased yield stability under post-anthesis water stress.
- Taxon
- wheatTriticum aestivume0
- Treatment
- two RDI treatmentse1
- Outcome
- yield stabilitye0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased grain yield and yield stability of wheat under post-anthesis water stress”
e1“The two RDI treatments had no significant effects on grain yield”
Claim · model-written summary
RDI significantly reduced water consumption.
- Taxon
- wheatTriticum aestivume0
- Treatment
- T1 and T2e0
- Outcome
- water consumptione0
- Direction
- reducede0
- Comparator
- the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“T1 and T2 significantly reduced water consumption and increased water productivity (WP) of wheat compared to the control.”
Claim · model-written summary
RDI increased wheat water productivity.
- Taxon
- wheatTriticum aestivume0
- Treatment
- T1 and T2e0
- Outcome
- water productivity (WP)e0
- Direction
- increasede0
- Comparator
- the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“T1 and T2 significantly reduced water consumption and increased water productivity (WP) of wheat compared to the control.”
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