Quantitative analysis of the growth, development and distribution of flowers and pods in oil seed rape (<i>Brassica napus</i> L.)

Tayo, T. O.; Morgan, D. G.

doi:10.1017/s0021859600053466

Cited by 83 publications

(51 citation statements)

References 2 publications

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“…1). Previous studies in B. napus have indicated that under typical conditions a plant differentiates more floral primordia than its photosynthetic capacity can support (Tayo and Morgan 1975;McGregor 1981). Therefore, typically only early formed floral primordia develop into flowers, become pollinated and produce fertile pods, while the primordia formed later may not develop into flowers or pods.…”

Section: Pod Formation and Developmentmentioning

confidence: 97%

Response of three Brassica species to high temperature stress during reproductive growth

Angadi¹,

Cutforth²,

Miller³

et al. 2000

Can. J. Plant Sci.

243

193

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Response of three Brassica species to high temperature stress during reproductive growth. Can. J. Plant Sci. 80: 693-701. The effect of short periods of high temperature stress on the reproductive development and yield of three Brassica species were studied in a growth chamber experiment conducted for 2 yr. Two genotypes from Brassica juncea L. and one each from B. napus L. and B. rapa L. were grown under day/night temperatures of 20/15°C till early flowering or early pod development, subjected to high temperature stress of 28/15°C or 35/15°C for 7 d and then allowed to recover at 20/15°C. Species differed in optimum temperatures, with B. juncea and B. rapa having higher optimum temperature than B. napus. Dry matter was unaffected by moderate temperature stress, while it was reduced by high temperature stress. The 35/15°C treatment was injurious to reproductive organs at different developmental stages of all three species. High temperatures at flowering affected yield formation more than high temperature at pod development. On the main stem, mean seed yield reduction due to heat stress was 89%, but partial compensation by pods on the branches reduced mean per-plant seed yield decrease to 52%. Reduction in fertile pods (not total pod number), thousand seed weight and seeds per pod were responsible for the reduced seed yield. Brassica rapa was more sensitive to heat stress than B. napus and B. juncea. Although observation did not indicate the exact developmental phase when the reproductive organs were susceptible to heat stress, pods that passed a critical threshold developmental phase tolerated heat stress, which explained the smaller effect of high temperature stress at pod development. A direct temperature effect on reproductive organs appeared to be responsible for the reduction in yield. All genotypes began to recover from the stress by continuing flowering after returning to 20/15°C. Brassica napus was least able to recover from severe stress at flowering, as evidenced by the formation of many abnormal pods during recovery. Per-plant yield response of canola-quality B. juncea line J90-4316 was similar to oriental mustard Cutlass. Thus, heat stress effect depends on the growth stage of canola and mustard and Brassica species differ in heat stress response. napus. La production de matière sèche ne souffrait pas d'un stress thermique modéré (28°C), mais elle était réduite en présence d'un stress élevé (35°C). Chez les 3 espèces, le régime 35°/15°C avait des effets néfastes sur les organes de reproduction à divers stades de leur formation. Des hautes températures à la floraison nuisaient davantage au rendement que quand elles survenaient lors de la formation des siliques. Sur la tige principale, la diminution moyenne de rendement grainier résultant d'un stress thermique était de 89 %, mais pour l'ensemble de la plante, elle n'était que de 52 %, grâce à une compensation partielle opérée par les ramifications. Le manque à produire résultait de la diminution du nombre de siliques fertiles (pas du nombre total de si...

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Section: Pod Formation and Developmentmentioning

confidence: 97%

Response of three Brassica species to high temperature stress during reproductive growth

Angadi¹,

Cutforth²,

Miller³

et al. 2000

Can. J. Plant Sci.

243

193

View full text Add to dashboard Cite

show abstract

“…High temperatures have the positive effect of promoting flowering. Alternatively, the plant might produce more flowering primordia than it is able to support photosynthetically (Tayo and Morgan 1975;Angadi et al 2000). Therefore, only the early-formed flowers develop into fertile pods, while the later-formed flowers may not be able to do so.…”

Section: Yield and Yield Componentsmentioning

confidence: 99%

Canola response to high and moderately high temperature stresses during seed maturation

Aksouh-Harradj¹,

Campbell²,

Mailer³

2006

Can. J. Plant Sci.

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Aksouh-Harradj, N. M., Campbell, L. C. and Mailer, R. J. 2006. Canola response to high and moderately high temperature stresses during seed maturation. Can. J. Plant Sci. 86: 967-980. Canola is a valuable oilseed crop worldwide. Temperature during the post-anthesis period plays an important role in determining the final yield and seed composition. Experiments were conducted in climate-controlled growth cabinets to test the effect of two high temperature regimes following a 24-h acclimation period on three canola cultivars differing in their thermotolerance. A long, moderately high temperature treatment of 28°C/23°C (day/night) was applied for 10 d from 20 to 30 d after flowering (DAF) and a short, very high temperature regime of 28°C/23°C (day/night) including a peak of 38°C reached for 5 h around midday for 5 d from 25 to 29 DAF. Very high temperature for 5 d reduced yield on the main stem by up to 52% for a sensitive cultivar by reducing seed weight. This treatment also decreased the oil/protein ratio, but had a lesser effect on fatty acid composition. The moderately high temperature treatment for 10 d had only affected yield of one cultivar and increased the oil/protein ratio of all cultivars. However, it had a more pronounced effect on the fatty acid profile. A short period of very high temperature at a sensitive stage can be as critical to canola as mild temperature stress over a longer period.Key words: Brassica napus, oil, protein, fatty acids, tolerance, acclimation, heat stress Aksouh-Harradj, N. M., Campbell, L. C. and Mailer, R. J. 2006. L'effet de deux types de stress thermiques sur le canola pendant la période de reproduction. Can. J. Plant Sci. 86: 967-980. Le colza est une espèce importante de graine oléagineuse dans le monde. Cependant, la température pendant la période de reproduction joue un rôle important dans la détermination du rendement grainier et de la composition finale de la graine. Des expériences ont été entreprises dans des phytotrons pour examiner l'effet de deux types de stress thermiques suivant une journee d'acclimatation sur trois variétes de canola différant dans leur potentiel de tolérance à la chaleur. Un long régime modéré de 28°C/23°C (jour/nuit) a était appliqué pendant 10 jours (de 20 à 30 jours après la fleuraison) et un autre régime brèf a haute température de 28°C/23°C, jour/nuit comprenant une pic de 38°C atteint pendant 5 heures au milieu de la journée pendant 5 jours (de 25 à 29 jours après la fleuraison). La réaction des cultivars a différé selon les deux traitements. Le traitement élevé pendant 5 jours a réduit le rendement sur la tige principale de 52% pour le cultivar sensible en diminuant le poids des grains. Ce traitement a également diminué le rapport huile/proteins, par contre a eu peu d'effet sur la composition d'acides gras. Le traitement modéré pendant 10 jours d'autre part, a eu moins d'effet sur le rendement grainier, a accru le rapport d'huile/proteins, mais a eu cependant un effet plus prononcé sur la proportion d'acides gras. Une période courte de h...

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“…Daily observations were taken to obtain the number of days from sowing to the following growth stages to record both the period of flowering and seed formation. In the last flower, the measurement was made on surface area of pods, using the formula 2 ℎ (r = half of the width of the pod at its middle point and h = the distance between the base of the pod) (Tayo and Morgan, 1975). At the time of maturity of the first pod of main raceme per plant, plant height, number of primary branches and number of siliques plant -1 were counted after harvest three plants per plot and then divided by three.…”

Section: Methodsmentioning

confidence: 99%

Response of Growth, Yield and Oil of Rapeseed to Sowing Method and Seeding Rate

Sarkees¹

2013

IOSR-JAVS

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Quantitative analysis of the growth, development and distribution of flowers and pods in oil seed rape (Brassica napus L.)

Cited by 83 publications

References 2 publications

Response of three Brassica species to high temperature stress during reproductive growth

Response of three Brassica species to high temperature stress during reproductive growth

Canola response to high and moderately high temperature stresses during seed maturation

Response of Growth, Yield and Oil of Rapeseed to Sowing Method and Seeding Rate

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