Permissions Icon Permissions. Abstract Ovule fertilization in relation to seed number determination in spring rapeseed, Brassica napus var. Brassica napus , fertilization , ovules , seeds. Issue Section:. You do not currently have access to this article. Download all slides. Sign in Don't already have an Oxford Academic account?
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This article is also available for rental through DeepDyve. View Metrics. Email alerts Article activity alert. Flower bud differentiation and leaf spheroid formation in Chinese cabbage. Scientia Agricultur Sinica, 6 : 36—40 in Chinese. Ma F S Embryology of Brassica campestris ssp. In: Botanical Society of China, ed s. Scientific papers abstract complication of annual meeting of the 55 th anniversary of Botanical Society of China.
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The systematic analyses and comparisons showed that the SNPP difference between the high- and low-SNPP lines was due to the accumulative differences in its components: the number of ovules, the proportion of fertile ovules, the proportion of fertile ovules to be fertilized, and the proportion of fertilized ovules to develop into seeds Figures 6 — 9 and Table 4.
Of these, the number and fertility of ovule are determined by the ovule differentiation and development processes before flowering Yang et al. The survival rate of fertilized ovules is determined by the seed development process after fertilization Li et al. Therefore, the results of both genetic and cytological analyses are highly accordant. These results provide solid evidences and systematic insights to further understand the mechanisms underlying the natural variation of SNPP, which will facilitate the development of high-yield cultivars in rapeseed.
It should be noted that the number of seeds per pod for the elite cultivar Zhongshuang11 is much more less than the number of ovules per ovary as well as its maximum reported in the current Figure 6 and previous Li et al. In addition, both the fertilization rate of ovules and the survival rate of fertilized ovules for the elite cultivar Zhongshuang11 were less than the maximum observed in the current studies Figure 8.
These results suggested the great potential of the genetic improvement of SNPP in rapeseed. No significant negative correlation was observed among these components i. More importantly, several lines with favorable characters related to SNPP have been found, such as high number of ovules No.
These lines could be used as the donor parents in the genetic improvement of SNPP. Furthermore, the lines with contrasting characters related to SNPP could be used to construct the genetic populations to map and further clone the underlying genes that are acting at the specific stages. The following study showed that qSN. A6 was controlled by maternal genotype effect due to the ovule sterility Yang et al. As expected, its additive effect 5. The high consistency between the results of genetic analysis and cytological observation of the parental lines with the mechanism and effect of the underling QTL highlights the usefulness of these lines for further study.
HW and JS designed the experiments. GL and XW provided the research materials. YY performed the genetic experiments. JZ collected the phenotypic data. YY and YW performed cytological experiments.
YY and JS analyzed the data. The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. Bleckmann, A. The beginning of a seed: regulatory mechanisms of double fertilization. Plant Sci. Chen, B. Chen, M. Cytological observation of the fertilization process in rapeseed Brassica napus L.
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