Variability and regulation of the number of ovules, seeds and pods according to assimilate availability in winter oilseed rape (Brassica napus L.)

Wang, Xiujuan; Mathieu, Amélie; Cournède, Paul-Henry; Allirand, Jean Michel; Jullien, Alexandra; Reffye, Philippe de; Zhang, Bao Gui

doi:10.1016/j.fcr.2011.02.008

Cited by 35 publications

(44 citation statements)

References 42 publications

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“…The residuals between the observed and fitted number of seeds per pod had larger and larger scatter as the seed number per pod increased. Because all the measured data were combined to estimate the parameters, this could lead to a discrepancy between the estimated and observed number of seeds per pod by ignoring the effect of pod location (the number of seeds per pod first remained constant and then decreased along the main stem (Wang et al, )).…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, the number of ovules per pod slightly increased with inflorescence position from the top to the bottom, while the number of seeds per pod was not significantly different between the inflorescences. Within inflorescences, the number of ovules per flower remained constant, though the number of seeds per pod decreased from the base to the tip of the inflorescence (Wang et al, ). The model estimates are in accordance with the experimental data.…”

Section: Discussionmentioning

confidence: 99%

“…Additionally, the probability of a fertilised ovule developing into a seed ( p ) increased slightly, which is consistent with our previous experimental findings. The mean number of seeds per pod increased at the tip of the stems of plants following ramification clipping (Wang et al, ). In a previous study, Tayo & Morgan () analysed the impact of shading and leaf removal on the number of pods on the main stem.…”

Section: Discussionmentioning

confidence: 99%

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Application of a probabilistic model for analysing the abortion of seeds and pods in winter oilseed rape (Brassica napus)

Wang

Mathieu

Cournède

et al. 2014

Annals of Applied Biology

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International audienceIn winter oilseed rape (WOSR), only a subset of ovules can develop into seeds in the majority of pods. Any difficulty during the process of seed production may result in seed or pod abortion. This study aimed to reproduce the process of seed development in WOSR based on a limited number of parameters. As a result of the complexity of the developmental patterns of WOSR, it is challenging to identify the roles of various factors that influence seed production using an experimental approach. Here, we present a stochastic probabilistic model of seed development. The generalised least squares method was implemented to estimate the model parameters using the experimental data. Experiments were done in Grignon (France) in 2008 and 2009. The variations in the parameters were analysed according to the following four factors: year, pod rank, inflorescence position and ramification-clipping treatment. The year had no effect on the number of ovules per ovary (í µí¼) and the probability of seed viability (p). The proportion of effective pollen grains (k) significantly decreased with pod rank at the end of the main stem. Inflorescence position influenced the number of ovules per ovary (í µí¼: 30.8–33.8 from top to bottom) and the parameter k. The mean number of seeds per pod on the main stem and the bottom ramification along the stem was larger than the other ramifications within one plant. Ramification-clipping treatment increased the number of ovules per ovary (í µí¼: 31 for control plants and 32 for clipped plants), the parameter k and the number of seeds per pod (p). This effect could be due to the competition for assimilates between the pods and seeds. Furthermore, the distribution parameters of the pollen number per stigma (m) remained stable, and the probability of pod survival (Bo) varied with different factors, including the year, pod rank and inflorescence position. Our results indicate that pollen germination is a factor that determines final seed number. This model can identify the impact of each of the factors that lead to the abortion of seeds and pods in WOSR, which include the position effect, assimilate competition and pollination limitation. However, further studies on the pollination process in WOSR should help to refine this model

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Application of a probabilistic model for analysing the abortion of seeds and pods in winter oilseed rape (Brassica napus)

Wang

Mathieu

Cournède

et al. 2014

Annals of Applied Biology

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“…Differences in the oilseed rape yield component "pods per plant" showed plant ability to compensate seed yield in cases when plant density was lower, such as due to decreased sowing rate and poor wintering). Wang et al (2011) observed that the number of pods per plant depends on the number of developed pods and aborted pods, which vary depending on different pollination conditions. It is obvious in our experiment that the sowing rate, which is the initial cause of plant density at harvest, influenced the pod number per plant ( Luthman et al (1987), who observed that later sown crops had fewer pods per plant (54 to 101) depending on the experimental year.…”

Section: Discussionmentioning

confidence: 99%

Sowing Date and Rate Effect on Winter Oilseed Rape (Brassica napus L.) Yield Components’ Formation

Balodis

Gaile

2016

Proceedings of the Latvian Academy of Sciences. Section B. Natural, Exact, and Applied Sciences.

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Contributed by Zinta GaileCrop yield per area is the product of plant density and productivity of an individual plant. Plant density and the time of winter oilseed rape sowing influences yield components (parameters of individual plant productivity), such as pod number per plant, seed number per pod, plant productivity, seed weight, and plant branching. The aim of this three-year (2008-2010) study was to investigate winter oilseed rape yield components depending on sowing date (five sowing dates) and sowing rate (four sowing rates for each variety) as initial cause of plant density at harvest for two type winter oilseed rape varieties (open pollinated 'Californium' and hybrid 'Excalibur'). Field trials were carried out at the Research and Study Farm "Vecauce" of the Latvia University of Agriculture. Winter oilseed rape yield components (pod number per plant and seed number per pod, plant productivity (seed number per plant and plant productivity in g) as well as the number of primary branches per plant) were affected (p < 0.05) by sowing date and rate for both varieties. In general, no significant effect of sowing rate on 1000-seed weight was observed (p > 0.05), but sowing date influenced this component significantly (p < 0.05). A yield compensation mechanism was demonstrated by significant (p < 0.05) negative correlations between plant density at harvest and parameters of individual plant productivity.

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“…Especially, remobilization of N from stems and leaves was more important for pod N accumulation than N uptake after florescence. In order to decrease the crop-inherent high N budget surplus of winter rapeseed requires, and it should increase the low N remobilization efficiency particularly of pericarp N to the grains (Wang et al, 2011;KoeslinFindeklee and Horst, 2016;Wang et al, 2016). Meanwhile the nitrogen transport efficiency is determined by the N supply levels and the genotypes (Gironde et al, 2015b).…”

mentioning

confidence: 99%

Nitrogen Recovery and Transport Efficiency of Winter Rapeseed and Residual Nitrogen Effect on Subsequent Sesame using 15N Labelling Technique

Wang¹

2017

IJAB

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In China, the application rate of nitrogen in rapeseed is high, but the uptake and utilization efficiency is low, which may cause irreversible environmental pollution. Use of efficient nitrogen rate and to improve nitrogen recovery, transport and residues management is important for crop productivity and sustaining the environment. Therefore, a pot was conducted using two winter rapeseed cultivars of Huayouza No.9 (HZ9) and Huashuang No. NRE of sesame from basal and topdressing was 1.91% and 1.34%, with a yield increase of 16.22% and 59.50% over the control, respectively. The integrated data indicated that higher N recovery and transport efficiency can be achieved by adequacy reducing application rate and increasing the proportion of topdressing, and the residual soil nitrogen of rapeseed can be recovered to some extent by planting sesame.

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Variability and regulation of the number of ovules, seeds and pods according to assimilate availability in winter oilseed rape (Brassica napus L.)

Cited by 35 publications

References 42 publications

Application of a probabilistic model for analysing the abortion of seeds and pods in winter oilseed rape (Brassica napus)

Application of a probabilistic model for analysing the abortion of seeds and pods in winter oilseed rape (Brassica napus)

Sowing Date and Rate Effect on Winter Oilseed Rape (Brassica napus L.) Yield Components’ Formation

Nitrogen Recovery and Transport Efficiency of Winter Rapeseed and Residual Nitrogen Effect on Subsequent Sesame using 15N Labelling Technique

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