Abstract
Seed number, the most variable yield component of legumes is strongly affected by heat stress (HS) and water deficit (WD). The objective of this paper is to investigate whether HS and WD reduced seed number in field pea through their negative effects on biomass production rather than by specific effects on the developing reproductive organs. Several field and glasshouse experiments were carried out in southern France, in which HS and / or WD of various intensities, durations and positions in the plant lifecycle were imposed on several pea cultivars. WD and HS reduced seed number, in an intensity-dependent manner. They also changed the distribution of seeds along the stem. Plants subjected to WD and mild HS had more seeds on the basal phytomers than did control plants, making it possible to exclude direct effects of stress on seed development. In contrast, severe HS resulted in the immediate abortion of reproductive organs. WD and HS also decreased net photosynthesis (Pn), but only during the period of constraint. Quantitative relationships between Pn and soil water status and between Pn and leaf temperature were established. Nevertheless, in all cases there was a single linear relationship between final seed number and plant growth rate during the critical period for seed set (from the beginning of flowering to the beginning of seed fill for the last seed-bearing phytomer). This reflects the reproductive plasticity of pea, which adjusts the number of reproductive sinks in an apparent balance with assimilate availability in the plant.
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Claims 8
Claim · model-written summary
Water deficit and heat stress reduced seed number according to intensity.
- Taxon
- field peat0
- Treatment
- WD and HSe0
- Outcome
- seed numbere0
- Direction
- reducede0
- Qualifier
- in an intensity-dependent mannere0
Not reportedComparator
Verbatim
e0“WD and HS reduced seed number, in an intensity-dependent manner.”
t0“field pea”
Claim · model-written summary
Water deficit and heat stress changed seed distribution along stems.
Verbatim
e0“They also changed the distribution of seeds along the stem.”
t0“field pea”
Claim · model-written summary
Water deficit and mild heat stress increased seeds on basal phytomers relative to controls.
Verbatim
e0“Plants subjected to WD and mild HS had more seeds on the basal phytomers than did control plants”
t0“field pea”
Claim · model-written summary
Severe heat stress caused immediate reproductive organ abortion.
Verbatim
e0“severe HS resulted in the immediate abortion of reproductive organs”
t0“field pea”
Claim · model-written summary
Water deficit and heat stress decreased net photosynthesis during constraint.
- Taxon
- field peat0
- Treatment
- WD and HSe0
- Outcome
- net photosynthesis (Pn)e0
- Direction
- decreasede0
- Qualifier
- only during the period of constrainte0
Not reportedComparator
Verbatim
e0“WD and HS also decreased net photosynthesis (Pn), but only during the period of constraint.”
t0“field pea”
Claim · model-written summary
Net photosynthesis was quantitatively related to soil water status.
Verbatim
e0“Quantitative relationships between Pn and soil water status and between Pn and leaf temperature were established.”
t0“field pea”
Claim · model-written summary
Net photosynthesis was quantitatively related to leaf temperature.
Verbatim
e0“between Pn and leaf temperature were established.”
t0“field pea”
Claim · model-written summary
Final seed number had one linear relationship with plant growth rate during the critical seed set period.
Not reportedSettingDirection
Verbatim
e0“there was a single linear relationship between final seed number and plant growth rate during the critical period for seed set”
t0“field pea”
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