Summary
The capitulum and stem diameter have been found to be negatively correlated with the percentage of the filled seed. The correlation is significant. The partial correlation between the above is also negative but the values are not significant which shows that it is the joint interaction of stem and capitulum diameter which markedly influences seed set. It has been concluded that increased stem thickness adversely affects seed set because of greater increase in leaf area which in turn restricts nutrient supply to the developing seeds. Both stem and capitulum diameter are important from yield point of view as they lead to increased seed producing area. It is essential for a good variety to have large capitula with well filled seeds. It has been pointed out that in a breeding program it should be possible to get desired combinations of above characters without much difficulty.
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References
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Khanna, K.R. Factors affecting the production of filled seeds in sunflower. Euphytica 21, 384–387 (1972). https://doi.org/10.1007/BF00036779
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DOI: https://doi.org/10.1007/BF00036779