Field studies on <sub>14</sub>C assimilate fixation and movement in oil-seed rape (<i>B. napus</i>)

Chapman, J.; Daniels, R. W.; Scarisbrick, D. H.

doi:10.1017/s0021859600041423

Cited by 44 publications

(29 citation statements)

References 14 publications

(10 reference statements)

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“…1B-D) at early flowering, but decreased to the lowest on leaf 8 during the early pod-filling stage, according to the growth stage key described by Harper and Berkenkamp (1975). This observation is consistent with findings of other studies in which leaves were reported to be an important sources of photosynthates up to early flower, when stems and pods became more significant exporters of photosynthates (Major et al 1978;Chapman et al 1984).…”

Section: Photosynthetic Ratessupporting

confidence: 90%

“…Leaves establish the sink potential in terms of structures such as number of pods per plant or number of seeds per pod and as a source of translocated photosynthates during their senescence, but eventually stems and pods become more important sources of photosynthates (Major et al 1978;Chapman et al 1984).…”

Section: Mots Clés: Colza Oléagineux Brassica Napus Photosynthèse mentioning

confidence: 99%

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Relationship of physiological characters to yield parameters in oilseed rape (Brassica napus L.)

Chongo¹,

McVetty²

2001

Can. J. Plant Sci.

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Relationship of physiological characters to yield parameters in oilseed rape (Brassica napus L.). Can. J. Plant Sci. 81: 1-6. The physiological basis of seed yield in oilseed rape (Brassica napus L.) still remains unclear, and conclusions on the contribution of such traits to seed yield are difficult to make. Nine cultivars, classified into three yield groups (high, medium and low) based on significant differences in seed yield from previous trials, were tested over two locations and years. Leaf chlorophyll content, net photosynthetic rate per unit leaf area (P A ), per unit leaf dry matter (P DM ) and per unit leaf chlorophyll (P C ), transpiration rate (T R ) and water use efficiency (WUE) were investigated on fully expanded leaf numbers 4 (vegetative), 6 (early flowering) and 8 (early podding stage) on the main stem and related to seed yield, total dry matter (TDM) and harvest index (HI) of each yield group. Differences among yield groups for seed yield, TDM and HI were significant. Chlorophyll content was lowest on leaf 4, but increased with leaf age. Correlations between net photosynthetic rate and seed yield were not found. However, cultivars in the high yield group maximized their net photosynthetic rates (P A , P DM , and P C ) on leaf 6 during early flowering at the time when T R was lowest and WUE at its highest. In the medium and low groups, photosynthetic rates were highest on leaf 4, but decreased to lowest values on leaf 8, together with the high yield group. In general, the results indicate that the largest contribution to net photosynthesis by oilseed rape leaves occurred during the vegetative and early flowering stages compared with the early pod-filling stage. Nous avons testé pendant deux ans à deux emplacements neuf cultivars répartis en trois catégories de rendement : élevé, moyen et bas, constituées d'après les différences significatives observées dans des essais antérieurs. La teneur en chlorophylle de la feuille, le rendement photosyntéthique net par unité de surface foliaire (P SF ), par unité de matière sèche (P MS ) et par unité de chlorophylle foliaire (P c ), le taux de transpiration (T R ) et l'efficience d'utilisation de l'eau (EUE) étaient mesurés sur la quatrième (stade végétatif), la sixième (début floraison) et la huitième (stade début de formation des gousses) feuilles déployées de la tige principale, puis mis en relation avec le rendement grainier (RG), le rendement total en m.s. (m.s.t.) et l'indice de récolte (IR) de chaque catégorie de rendement. Les différences constatées entre les catégories de rendement quant à ces trois critères étaient statistiquement significatives. La teneur en chlorophylle marquait son plus bas niveau dans la feuille 4, mais elle augmentait avec l'âge des feuilles. Nous n'avons pas relevé de corrélation entre le rendement photosynthétique net et le rendement grainier. Toutefois, les cultivars situés dans la catégorie de rendement supérieure maximisaient leur rendement photosynthétique net (P SF , P MS et P c ) dans la feuille 6 en début de floraiso...

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Section: Photosynthetic Ratessupporting

confidence: 90%

Section: Mots Clés: Colza Oléagineux Brassica Napus Photosynthèse mentioning

confidence: 99%

Relationship of physiological characters to yield parameters in oilseed rape (Brassica napus L.)

Chongo¹,

McVetty²

2001

Can. J. Plant Sci.

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“…The changing importance of different photosynthesizing organs as sources of assimilates for developing seeds was also recognized in field studies with a B. napus winter cultivar in the United Kingdom (Chapman et al 1984). Major sources of assimilates for developing seeds between early flowering and maturity were, in chronological order, upper leaves, stems and finally the pods themselves.…”

Section: Carbon/nitrogen Metabolismmentioning

confidence: 93%

Physiological Constraints and Their Genetic Manipulation

Thurling¹

1993

Monographs on Theoretical and Applied Genetics

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“…Clarke (1978) also found that foliage removal at the flowering stage had a greater impact on seed yield than foliage removal at the end of flowering. Tolerance of defoliation at late flowering and pod filling stages probably occurs because canola plants rely on photosynthates assimilated directly by the stems and pod walls and stored photosynthates for seed filling (Major et al 1978;Chapman et al 1984).…”

Section: Effect Of Defoliation On Grain Yield Yield Components and Omentioning

confidence: 99%

Response of canola to simulated diamondback moth (Lepidoptera: Plutellidae) defoliation at different growth stages

Ramachandran¹,

Buntin²,

All³

2000

Can. J. Plant Sci.

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In field trials conducted during 1995–1998, canola cultivar "Falcon" was subjected to different levels of simulated insect defoliation at four stages of crop growth. Plants were 0, 33, 67 and 100% defoliated at rosette and flowering stages during the 1995–1996 season as well as 2–4 leaf stage during the 1996–1997 and 1997–1998 seasons. Plants were 0, 50 and 100% defoliated at pod filling stage during all seasons. Over all seasons, defoliation did not consistently affect the number of plants per unit area, plant height, 1000 seed weight, and oil content of seeds for most of the defoliation treatments. However, defoliation at the 2–4 leaf and rosette stages made plants more susceptible to cold injury. Generally, canola could withstand a higher level of defoliation as crop development progressed. Maximum yield reductions occurred for defoliations at the 2–4 leaf stage followed by the rosette and flowering stages of the crop. No significant yield losses were recorded for defoliations at the pod filling stage. Results suggest that canola is most sensitive to defoliation in its early stages of growth. Greater amounts of defoliation can be tolerated as crop development progresses. The relationships between defoliation and yield loss were used to establish diamondback moth economic injury levels for canola at different crop growth stages. Key words: Canola, Brassica napus, oilseed rape, simulated defoliation, economic injury level

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Field studies on ₁₄C assimilate fixation and movement in oil-seed rape (B. napus)

Cited by 44 publications

References 14 publications

Relationship of physiological characters to yield parameters in oilseed rape (Brassica napus L.)

Relationship of physiological characters to yield parameters in oilseed rape (Brassica napus L.)

Physiological Constraints and Their Genetic Manipulation

Response of canola to simulated diamondback moth (Lepidoptera: Plutellidae) defoliation at different growth stages

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Field studies on 14C assimilate fixation and movement in oil-seed rape (B. napus)

Cited by 44 publications

References 14 publications

Relationship of physiological characters to yield parameters in oilseed rape (Brassica napus L.)

Relationship of physiological characters to yield parameters in oilseed rape (Brassica napus L.)

Physiological Constraints and Their Genetic Manipulation

Response of canola to simulated diamondback moth (Lepidoptera: Plutellidae) defoliation at different growth stages

Contact Info

Product

Resources

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Field studies on ₁₄C assimilate fixation and movement in oil-seed rape (B. napus)