Abstract
Summary— Pea seeds were grown in a glasshouse and subsequently transferred to and grown in an environmentally controlled growth chamber (20 C day, for 16 h; 13 C night, for 8 h). Seven days after anthesis, plants were exposed to 28 or 31 C for 6 h during the middle of the day, for 2 or 4 consecutive days. Control plants were maintained at 20 C. Elevated temperatures did not influence growth and development of the leaves, flowers, or the number of pods per plant. However, they reduced the number of seeds per pod. By categorizing the different stages of flower and pod development at the time of elevated temperature treatment, we determined that developing seeds were thermally sensitive from about 6-12 days after the flower opened. Developing seeds exposed to high temperature during this period aborted and the net result was a reduction in pea seed yield. Extrapolating these data to field conditions we suggest relevant criteria to diagnose an effect of high temperature where reduced yields are obtained. growth / development / yield / seed abortion / critical thermoperiod / field diagnosis Rsum — Effet d'une courte priode de hautes tempratures diurnes pendant la floraison sur le nombre de graines par gousse du pois protagineux (Pisum sativum L). Des pois ont t cultivs en serre, puis en chambre de culture (16 h de jour 20 C ; 8 h de nuit 13 C). Sept jours aprs le dbut de la floraison, une partie des plantes a t soumise, pendant 2 ou 4 j conscutifs, des tempratures leves, 28 ou 31 C ; la priode de traitement tait de 6 h au milieu de la photophase. Les autres plantes, maintenues 20 C, servaient de tmoins. Ni le dveloppement (mission des feuilles (tab II), progression de la floraison (tab III) et du stade limite d'avortement (fig En revanche, le nombre de graines par gousse est significativement affect par les hautes tempratures (fig En regroupant les fleurs et les gousses selon le stade de dveloppement qu'elles avaient atteint au dbut du traitement, on dtermine que les graines sont sensibles aux hautes tempratures entre 6 et 12 j aprs ouverture de la fleur. Des graines en dveloppement, soumises des hautes tempratures pendant cette priode, avortent, ce qui rduit le rendement en graines. Cette tude permet de dfinir les variables pertinentes mesurer sur la plante, pour diagnostiquer un effet des tempratures leves, au champ. dveloppement / croissance / rendement / avortement de graines / priode critique / diagnostic cultural
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Claims 5
Claim · model-written summary
Elevated temperature did not affect leaf and flower growth or development or pods per plant.
- Taxon
- pea (Pisum sativum L)
Lathyrus oleraceust0 - Treatment
- Elevated temperaturese0
- Outcome
- growth and development of the leaves, flowers, or the number of pods per plante0
- Direction
- did not influencee0
- Comparator
- 20 Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Control plants were maintained at 20 C. Elevated temperatures did not influence growth and development of the leaves, flowers, or the number of pods per plant.”
t0“pea (Pisum sativum L)”
Claim · model-written summary
Elevated temperature reduced pea seeds per pod.
- Taxon
- pea (Pisum sativum L)Lathyrus oleraceust0
- Treatment
- Elevated temperaturese0
- Outcome
- number of seeds per pode0
- Direction
- reducede0
- Comparator
- 20 Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Control plants were maintained at 20 C. Elevated temperatures did not influence growth and development of the leaves, flowers, or the number of pods per plant. However, they reduced the number of seeds per pod.”
t0“pea (Pisum sativum L)”
Claim · model-written summary
Developing pea seeds were heat sensitive about 6–12 days after flower opening.
- Taxon
- pea (Pisum sativum L)Lathyrus oleraceust0
- Organ / stage
- developing seedse0
- Outcome
- developing seeds were thermally sensitivee0
- Qualifier
- about 6-12 days after the flower openede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“developing seeds were thermally sensitive from about 6-12 days after the flower opened”
t0“pea (Pisum sativum L)”
Claim · model-written summary
High temperature in the sensitive period caused developing pea seed abortion.
- Taxon
- pea (Pisum sativum L)Lathyrus oleraceust0
- Treatment
- high temperaturee0
- Outcome
- Developing seeds exposed to high temperature during this period abortede0
- Comparator
- 20 Ce1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Developing seeds exposed to high temperature during this period aborted”
e1“Control plants were maintained at 20 C.”
t0“pea (Pisum sativum L)”
Claim · model-written summary
High temperature reduced pea seed yield.
- Taxon
- pea (Pisum sativum L)Lathyrus oleraceust0
- Treatment
- high temperaturee0
- Outcome
- pea seed yielde0
- Direction
- reductione0
- Comparator
- 20 Ce1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Developing seeds exposed to high temperature during this period aborted and the net result was a reduction in pea seed yield.”
e1“Control plants were maintained at 20 C.”
t0“pea (Pisum sativum L)”
The same questions in other papers
heat · yield · Lathyrus oleraceus (pea)Results differ
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